SPOT-6 and SPOT-7
SPOT-6 & -7 are twin commercial Earth observation satellites operated by Airbus Defence and Space (previously as Astrium Services), launched in 2012 and in 2014, respectively. Each satellite has a life-expectancy of 10 years from launch and will continue to image land processes with improvements in end-user operation. The constellation preserves and extends upon the previous SPOT 1-5 missions.
|CEOS EO Handbook||See SPOT-6 and SPOT-7 summary|
The New Astrosat Optical Modular Imager (NAOMI) is the pushbroom imaging system for SPOT-6 &-7 and has various applications in land-use management, cartography and national security. The spacecraft has five spectral bands, inclusive of one panchromatic band, one Near infrared band (NIR), and three multispectral bands (Blue, Red, Green). The NAOMI instrument measurements remain consistent with the previous SPOT 1-5 missions, gathering data from parameters such as Earth surface albedo and reflectance, vegetation, and land-surfaces.
NAOMI contains two identical Korsch telescopes in silicon carbide that each deliver an aperture of 200mm and a field of regard of ±30°. Each telescope contains a detector with a TDI (Time Delay Integration) matrix of 7000 pixels for the panchromatic channel and four lines of 1750 pixels for the multispectral channel. The panchromatic bands hold a 1.5m to 2.5m GSD (ground sample distance) at nadir in comparison to multispectral bands holding 6m to 10m GSD at nadir. The constellation has spatial resolution of 2m for panchromatic bands, and 8m for multispectral bands with a 60km swath width at nadir using two imagers, or 120km with a single pass mosaic.
The twin satellites are in a sun-synchronous orbit that is inclined at 98.2° and are situated at an altitude of 694km. There is a one-to-five day revisit capability and 6 programming plans per day that cover more than 3 million km2 per day per satellite.
Space and Hardware Components
SPOT-6 &-7 maintain the newly developed spacecraft bus AstroBus-L (or AstroSat250) which provides the constellation with mosaics (5 contiguous strips), agility and multiple acquisitions over an area of interest. The platform design meets specific agility standards through the control movement gyroscope (CMG) which gives the satellite superior manoeuvrability in a single passing. This is primarily due to the spacecraft's ability to pitch and roll forward, backwards and sideways by 45°, twice as fast as previous designs.
There is also a ground segment that is divided into two major parts. The CGS (control ground segment) is responsible for the control, command, monitoring and maintenance of the twin satellites in their orbit. The EGS (exploitation ground segment) manages the programming, gathering and analysis of image data to archive and produce image products. An S-band service is utilised and connected to the control ground segment for telemetry data exchanges between SPOT-6 and SPOT-7, which is in accordance with the AstroTerra system - a dynamic network of global communication channels that provide end-users with information regarding satellite monitoring.
SPOT-6 and SPOT-7 Commercial Imaging Constellation
In 2008, Spot Image of Toulouse, France, and partners (EADS Astrium) started an initiative to build a new commercial SPOT mission series, referred to as SPOT-6 /-7, to continue sustainable wide-swath high-resolution observation services as currently provided by the SPOT-5 mission. Having full support from EADS Astrium (Spot Image's majority shareholder), manufacturing of the twin constellation SPOT-6 & -7 was officially announced in mid-2009 by Astrium Services' CEO Eric Beranger. The first launch is scheduled for 2012.
The current (2011) SPOT constellation of two satellites (SPOT-4, and SPOT-5) offers the broadest range of imagery, including, 2.5, 5, 10, and 20 m resolutions. The goal of the new SPOT-6 and -7 series is to guarantee a sustainable operational service to the end users. 1) 2) 3) 4)
From a technical point of view, SPOT-6 & -7 will inherit SPOT-5's experience, using new developments from Pléiades-1 & -2 program, as well as from the latest validated technology.
The SPOT-6 & -7 satellites will address the SPOT 5 market with improved characteristics:
• Same image swath of 60 km to maintain a high level of coverage capability
• Better resolution with 1.5 m orthoimage products
• Addition of a blue band to get native natural colour images
• Ultimate satellite agility, enabling to achieve efficiently both collection of large coverage and the collection of individual targets: more than 3 million km2 per day for each satellite
• Reactive tasking: Advanced programming efficiency with up to 6 programming plans per day and per satellite uploads possible to obtain cloud-free imagery
• Daily revisit capability thanks to the phased constellation of SPOT-6 & SPOT-7
• 10-year lifetime for each satellite, assuring data continuity towards 2023.
The SPOT-6/-7 spacecraft will operate in tandem with the 1 m resolution TerraSAR-X and TanDEM-X radar satellites of DLR, whose commercial data is available to Astrium affiliate Infoterra, and the high-resolution Pleiades-1 and -2 spacecraft. The two Pleiades spacecraft were publicly funded but will be operated for commercial use by Spot Image. Hence, Spot Image will become the first commercial operator offering two High-Resolution satellites (1.5 m imagery) and two Very High-Resolution satellites (50 cm range of imagery).
CNES, the French Space Agency, is terminating its SPOT program (which started in 1986 and provided an uninterrupted observation service so far) with an expected retirement of SPOT-5 in the timeframe 2014-15. The SPOT-5 mission (launch May 4, 2002) has already exceeded its nominal design lifetime of 5 years.
In July 2008, EADS's Astrium Services unit has acquired a majority stake in Spot Image S.A. in a move that promises to propel the company to the forefront of the international space imagery market. Astrium agreed to acquire most of the French space agency CNES's holding in Spot Image, giving it an 81% stake in the Toulouse-based optical imaging specialist with five subsidiaries and strategic agreements around the world.
In mid-2009, the Astrium Services Division of EADS is committing to the development of the spacecraft, SPOT-6 and SPOT-7, even though it does not yet have any government funding or pre-sales agreements. The satellites, to be built by Astrium Satellites Division and launched in September 2012 and late 2013, respectively, will be the first ever built on a private basis and mark a watershed in the geospatial information service industry. Although U.S. imaging satellites like Ikonos and GeoEye are funded privately, they rely on guaranteed sales by the National Geospatial Intelligence Agency to finance satellite purchase. 5) 6) 7) 8)
Since early 2011, Spot Image, as well as Infoterra, a German-based radar imaging specialist with affiliates in France, the U.K., Spain and Hungary, is now fully integrated into the "Geo Information Division" of Astrium Services. 9)
The SPOT-6/-7 satellites are funded by Astrium alone; the company owns the data and system (satellites and ground segments). Astrium is also the commercial satellite operator. This is the first time in the remote-sensing industry that satellite development costs have been funded entirely with private funds. 10)
As of January 1, 2014, former EADS rebranded itself as the Airbus Group, with three divisions that include: 11)
- Airbus, focussing on commercial aircraft activities
- Airbus DS (Airbus Defence & Space), integrating the Group's defence and space activities from Cassidian, Astrium, and Airbus Military
- Airbus Helicopters, comprising all commercial and military helicopter activities.
The former Astrium subsidiary was merged into the Airbus DS in late 2013. The new Airbus DS started operating at executive level as of January 1, 2014. The GEO-Information Division of Astrium Services became the program line "Geo-Intelligence", of Airbus DS.
After the consultation process with the works councils, expected to be concluded by mid-2014, the three entities – Airbus Military, Astrium and Cassidian – will be fully integrated and operational at all levels as Airbus DS. 12)
Spot Image and EADS Astrium in 2007 completed the design work on the SPOT-6 satellite with a launch mass of ~ 800 kg. The spacecraft features CMGs (Control Moment Gyroscopes) instead of reaction wheels to improve pointing manoeuvrability. The satellite's in-orbit design life will be 10 years.
Initially, the SPOT-6 and SPOT-7 program was code-named "AstroTerra" and was an initiative of Spot Image to ensure SPOT service continuity. The timely delivery of the satellites is of prime importance13) for Spot Image, in order to guarantee, without interruption, the level of service expected by its customers. 14) 15) 16) 17)
Parameter / Spacecraft
SPOT-6 / -7
May 4, 2002
SPOT-6 on Sept. 9, 2012
714 kg (including 60 kg for payload and 80 kg of propellant)
SPOT MK2 (extended version)
AstroBus-L (also known as AstroSat-250 or AS250)
Body: 3.1 m x 3.1 m x 5.7 m
Body: ~ 1.55 m x 1.75 m x 2.7 m
Spacecraft design life
2 x HRG (High Resolution Geometric)
2 x NAOMI
Pan: 5 m (2.5 m supermode),
Pan: 2 m,
60 km (1 imager)
60 km (2 imagers)
Daily image acquisition capability in HR mode
up to 3 x 106 km2/ day in operation
up to 3 x 2 x 106 km2/ day in operation
Roll only (mirrors), 30º in 8 s
All axes platform, 30º in 12 s
Single pass stereo capability
Only through HRS
Single pass stereo and tri-stereo
50 m without GCP
35 m without GCP; < 10 m with Ref3D
Just-in-time tasking capability
No (1 mission plan/day)
Yes (up to 6 mission plans /day)
HRS, Vegetation, DORIS
1 (45º) to 5 days (30º)
832 km, sun-synchronous,
695 km in quadratic phase with Pleiades satellites
The SPOT-6/-7 satellites are based on the platform family named AstroSat-250 (also referred to as AstroBus-L), i.e. an upgraded version derived from the FormoSat-2 and THEOS missions, featuring CMGs (Control Moment Gyros) as actuators. This technology will provide the satellites with an unrivalled agility, allowing single-pass stereo or tri-stereo, mosaics (up to 5 contiguous strips), as well as multiple acquisitions over a given target area.
AstroBus-L description (Ref. 14):
The AstroBus-L is a standard, modular, ECSS (European Cooperation for Space Standards) compatible satellite platform compatible with an in-orbit lifetime of up to 10 years, with consumables sizeable according to the mission needs. The platform design is one-failure tolerant and the standard equipment selection is based on minimum Class 2 EEE (Electrical, Electronic, and Electromechanical) parts, with compatibility to Class 1 in most cases. It is implemented on AstroTerra (SPOT-6/-7), SEOSat/Ingenio of Spain, GMES/Sentinel-2 of ESA, EarthCARE of ESA, and the Kazakhstan HR imaging satellite of KGS (Kazakhstan Gharysh Sapary), currently referred to as ERSSS (Earth Remote Sensing Space System).
The AstroBus-L platform is designed for direct injection into LEO (Low Earth Orbit). Depending on the selection of standard design options, AstroBus-L can operate in a variety of Low Earth Orbits at different heights and with different inclinations.
Note: The AstroBus-L platform is also referred to as AstroSat-250 (or AS250). The AstroSat-250 standard architecture reflects the large experience gained by Astrium in many Earth Observation missions. AstroSat-250 combines heritage with flexibility for customisation. Through optimization of reuse, it helps to reduce program risk and to achieve reliable schedule and cost commitments. It ensures high quality and robustness due to the continuous application of proven solutions and it guarantees the continuity of engineering skills.
Both satellites have drawn on technological and operational innovations conceived for some of them for the Pleiades constellation (CMG, FOG) and for others on Astrium's product lines. The satellites are in particular based on an Astrium AS250 new generation avionics based on a standard core avionics (computer, data handling unit, software) and state-of-the-art technologies (agile gyro-less attitude control concept, ...), and integrated on a small-sized structure together with an optical instrument based on the NAOMI product line.
Both satellites are agile due to their CMGs. Even if today many satellites are manoeuvrable, all do not swing and re-target at the same speed. CMGs allow the satellites to pitch and roll forward, backwards and sideways up to 45° very quickly - twice as fast as earlier designs such as Momentum Wheels. Why does the user care? Because it increases the number of images that can be collected during the same pass. In a shell, collections opportunities are more numerous, scheduling conflicts between contiguous requests are vastly reduced, and then, the average acquisition window is much narrower. Icing on the cake, the acquisition on the same pass of several targets at the same latitude becomes possible.
The core of the AstroBus-L electrical platform is the redundant OBC (On-Board Computer). The OBC includes processing, reconfiguration and timing functions while the complete I/O system is allocated in a separate physical unit, the RIU (Remote Interface Unit), which enables mission customization. The backbone for the onboard communication is formed by two MIL-STD-1553 buses, one serving the platform and one serving the payload. Optional SpaceWire interfaces allow for the transmission of data at high rates between the OBC and e.g. special payloads.
The LEON3-FT (Fault Tolerant) microprocessor, namely the SCOC3 (Spacecraft Controller On-a- Chip), is being used as OBC. SCOC3 has been developed at EADS Astrium SAS; it is manufactured by Atmel.
A standard S-band TT&C system with full spherical coverage in uplink and downlink is used for satellite command reception and telemetry transmission. Ciphering functions are available either integrated within the OBC or in form of an add-on unit to the OBC called DCU.
ADCS (Attitude Determination and Control Subsystem)): The enhanced 3-axis stabilization attitude control system is based on a set of 4 RW (Reaction Wheels) for fine-pointing with 3 MTQ (Magnetic Torquers) for off-loading. In case of very high agility requirements, the reaction wheels are replaced by Astrium patented CMGs (Control Moment Gyros).
Attitude and orbit measurement is performed with a GPS and a Star Tracker (STR) for nominal operation, providing a pointing accuracy of up to 500 µrad (3σ) and a pointing knowledge of up to 30 µrad (3σ), depending mainly on STR accommodation and alignment accuracy. While standard precise attitude control is performed without the support of a gyro, an optional inertial measurement unit can be added for attitude control improvement. On-board orbit determination accuracies of < 10 m (1σ) are achieved, if the standard 1-frequency GPS design is applied. The 2-frequency GPS option provides on-board orbit determination accuracies of < 3 m (1σ).
Legend to Figure 4: The SPOT-6 spacecraft is the firat EO mission to utilize Sodern's new generation HYDRA star tracker for guidance and navigation. With HYDRA, Sodern is offering a multi-head design which separates the optical head from the centralized processing unit. This eases the thermal control of the optical heads and allows continuous attitude measurement, whether the satellite is facing Earth, the Sun or other bright objects.
Safe mode attitude sensing is based on a Magnetometer (MAG) / Sun Sensor (BASS) system or optionally a Magnetometer / Coarse Earth Sun Sensor (CESS) system. This provides two optional Safe mode attitude control principles:
1) Sun oriented, magnetic field spin controlled, or
2) Earth oriented.
Propulsion system: A mono-propellant propulsion system is implemented to allow for orbit maintenance and optionally for rapid rate damping during initial acquisition in case of the Earth oriented safe mode. Different tank sizes and thrusters configurations are available to cover specific mission needs.
EPS (Electrical Power Subsystem): The EPS is built around an unregulated 28 V Power Bus. GaAs triple junction solar cell based arrays, which are either composed of standard panels or have to be tailor designed to suit mission needs, are used for power generation. Power control and distribution functions are combined in the PCDU (Power Control and Distribution Unit).
For missions with a low power demand (< 1200 W) and only slight variations in solar array illumination conditions, a standard PCDU with shunt regulation system is foreseen. Higher power demand can be satisfied with MPPT (Maximum Power Point Tracker) regulation based PCDU, which can be selected from a set of different peak power values. Sufficient FCLs and LCLs in different power classes are provided for platform and payload power distribution and protection. Furthermore, a comfortable amount of heater switches and redundant release actuators is available. Electrical energy is stored in Li-ion batteries, for which a large range of different capacities is available.
The AstroBus-L software is based on a modular architecture with a standard mission and hardware independent core consisting of the RTEMS operating system and the Astrium CDHS (Core Data Handling System). A library of reusable hardware-and mission dependent software elements exists which can be used as basis for construction of individual mission customized software versions. The process of mission specific software customization and development is done in compliance with ECSS E-40 and Q-80.
An essential feature of AstroBus-L is the robust standard FDIR (Failure Detection, Isolation and Recovery) concept, which is hierarchically structured and can easily be adapted to specific mission needs.
Payload data are being stored in NAND flash memory technology SSR (Solid State Recorder) based on integrated CoReCi (Compression Recording and Ciphering) units of Airbus DS, available at various capacities ranging from 1 Tbit to ~ 10 Tbit. Options exist for inclusion of compression and encryption functions within the CoReCi. Several different standard algorithms are available for this purpose. 18)
CoReCi implementation parameters for SPOT-6: 19)
- Modular architecture adaptable to various data rates and capacities
- Input data rate up to 1.4 Gbit/s
- Capacity 850 Gbit (EOL) with Flash technology
- Embedded Wavelet Image Compression with MRCPB algorithm
- Ciphering based on AES (Advanced Encryption Standard) algorithm with 127 x 128 bit ciphering keys
- Data Formatting according to CCSDS ESA Packet Telemetry Standard
- Instrument mass: 14 kg
- Power consumption 75 W during simultaneous data record / data compression / data replay.
CoReCi on SPOT-6 represents the first commercial use of Flash storage technology in an on-board PDHU (Payload Data Handling Unit).
RF communications: The standard for downlink of payload data is a 300 Mbit/s 2-channel cold redundant X- band. The data transmission system uses QPSK modulation. A single Isoflux antenna provides the necessary ground coverage. Optionally, other systems can be incorporated in case of higher downlink data rate needs. Encryption of downlink data can be implemented as option. A number of different basic mechanical standard configurations are available which can be used as foundation for mission customization in many typical applications. The TT&C data are transmitted in S-band.
The SPOT-6 spacecraft was launched on Sept. 9, 2012 on a PSLV vehicle (flight PSLV-C21) from SDSC (Satish Dhawan Space Center) SHAR on the east of India. 20) 21)
In April 2012, Astrium SAS signed a launch agreement with Antrix Corporation Ltd. (the commercial arm of ISRO). 22)
The secondary payload on this flight was:
• PROITERES, a nanosatellite (15 kg) of the Osaka Institute of Technology, Osaka, Japan
The nominal launch of SPOT-7 is planned for 2014.
Orbit: Sun-synchronous circular orbit, altitude = 694 km, inclination = 98.2º, LTAN = 22:00 hours. When SPOT-7 is in orbit, both spacecraft will be deployed into the same orbital plane phased at 180º.
Note: Astrium Geo-Information Services is the civil operator of the Pleiades constellation (Pleiades-1A and -1B) as well as the operator of the SPOT-6 and SPOT-7 constellation. When SPOT-7 is launched in 2014, there will be 2 x 2 satellites, a true constellation with all spacecraft in the same orbital plane, coherently operated (90° one from the other on the same orbit) through a single interface (Ref. 55).
Launch: The SPOT-7 satellite was launched on June 30, 2014 (04:22:00 UTC) on ISRO's PSLV vehicle (flight PSLV-C23) from SDSC (Satish Dhawan Space Center) SHAR on the east coast of India. 23) 24) 25)
Insertion orbit: Sun-synchronous circular orbit, altitude = 660 km, inclination = 98.23º, LTAN = 10:00 hours.
The secondary payloads on this flight were:
• CanX-4 and CanX-5, a pair of identical nanosatellites (each of 15 kg) of UTIAS/SFL (University of Toronto, Institute for Aerospace Studies/Space Flight Laboratory), Toronto, Canada.
• AISAT (Automatic Identification System Satellite), a technology demonstration nanosatellite (14 kg) of DLR (German Aerospace Center). 26)
• VELOX-1 is a 3U CubeSat with a mass of 4.5 kg of SaRC (Satellite Research Center) at NTU (Nanyang Technological University), Singapore.
The SPOT-7 spacecraft will join the orbit in which its twin, SPOT 6, and the very-high-resolution observation satellites Pleiades 1A and 1B are located, and will be positioned at 180º in relation to SPOT 6 (Figure 13). After SPOT-7 has undergone a period of tests in orbit, Airbus Defence and Space's optical constellation will be at its full operational capacity.
In addition, PSLV-C23 hosts one attached payload, the AINS (Advanced Inertial Navigation System) which will ride uphill with the launcher, making navigation measurements during ascent that are purely used for the validation of the system for potential use on Indian launch vehicles in the future. Data provided by AINS is not used to navigate the PSLV launcher on this flight and is collected for downlink to the ground to examine the accuracy and performance of the new navigation system that is smaller in size than the old unit, but delivers a higher accuracy (Ref. 24).
• January 30, 2018: Airbus has launched near real-time satellite imagery capabilities together with its 24/7 Emergency Image Delivery Service to aid those facing emergency situations. By leveraging the KSAT (Kongsberg Satellite Services) polar ground station in Svalbard, Norway, the Pleiades and SPOT constellation images are now retrieved at every orbit, resulting in ultra-fast image deliveries after collection, anywhere in the world. 27)
- In addition to this advanced reactivity, the 24/7 Service gives customers easy, immediate and round-the-clock access to a dedicated team of satellite experts who provide timely support in case of unplanned events.
- "When facing crises, time is critical. With our 24/7 Emergency Service, offering an image delivery time averaging two hours after acquisition, emergency situations can be treated with an even higher priority and our customers and partners will receive their mission critical satellite images much faster," said François Lombard, Head of the Intelligence Business at Airbus Defence and Space.
- The 24/7 Emergency Image Delivery Service, relying on advanced Near-Real Time capability, was developed to answer customers' specific requirements when facing unplanned events, geopolitical crises, natural or man-made disasters. It provides timely, reliable and accurate satellite images to assess damage and help mitigate the impact on those affected. The service ensures that satellite resources, such as the wide-swath SPOT or very high-resolution Pleiades constellations, are booked with the highest tasking priority, guaranteeing accelerated access to data worldwide. The service is also designed to be flexible, providing the possibility of last-minute modifications or cancellations. With this improved performance and capability, Airbus further enhances its ability to deliver timely and accurate satellite images using its smart and complete optical and radar constellations consisting of Pleiades & SPOT 6/7 satellites, DMC Constellation as well as TerraSAR-X and TanDEM-X radar satellites.
• August 28, 2017: Airbus Defence and Space will be working with the GIS mapping engine operator Satshot to provide high-resolution SPOT-6/-7 satellite data over a large area of the corn and wheat belt within the continental United States. SPOT-6/-7 data is integrated into the Satshot platform, which can be used for deep analysis of specific farmland for further improved operations and efficiency. 28) 29)
- Satshot is a fully customized cloud-based online GIS (Geographic Information System) mapping engine that handles satellite imagery distribution, analysis, and management for the agricultural (ag) industry. Satshot relies on three main platforms (Mapcenter, Landscout and iCue) along with various imagery to help growers be more efficient in the field. SPOT- 6/-7 data can be used within Satshot's platforms for a variety of applications, such as: crop health monitoring and stress estimation throughout the season, NDVI (Normalized Difference Vegetation Index), crop damage assessment for insurance, land use sustainability management, land value, and Precision Ag VRT (Variable Rate Technologies).
- SPOT-6/-7 data provides 1.5 m high resolution natural color and near infrared information with daily collection opportunities making the data a valuable source for analysis and decision-making in the ag industry. The large swath and coverage capabilities of the twin satellites allow for mapping from a national level down to fragmented farmland parcels at a very competitive price point. This trade-off between resolution, coverage and revisit is key to monitor crop growth and needs more closely and make better informed decisions.
- François Lombard, Head of the Intelligence Business at Airbus Defence and Space said they are thrilled to have a partner like Satshot, who is leveraging their SPOT-6/-7 satellites to serve the US agriculture industry with high value information. He added that disseminating imagery and value added data into the hands of our partners will provide near real-time solutions for farmers, agribusinesses and will have a positive impact on food production and sustainability.
- Lanny Faleide, President and founder of Satshot continued saying that this is the first time satellite imagery of this quality and resolution will be accessible to the ag market at exactly the scale needed and at an attractive price level. They are extremely excited to get this data in the hands of everyone in the ag industry to truly help create added insight and understanding concerning our clients' fields and managed crops.
• May 24, 2017: Airbus Defence and Space has signed a 4-year contract with Scanex, the Russian Earth observation company, for access to optical satellite imagery via the One Atlas platform, covering 180 million km2 throughout the contract. 30)
- Yandex, one of the largest Internet companies in Europe, and operating Russia's most popular search engine, will directly benefit from this agreement. Yandex feeds its Yandex.Maps portal by purchasing satellite imagery from Scanex.
- The 180 million km2 of One Atlas data will be integrated into Yandex.Maps, ensuring access to fresh SPOT satellites 1.5 m resolution images on a global scale, and Pleiades satellite 0.5 m resolution product over cities. One Atlas is a satellite image basemap which covers the earth landmasses with professional grade imagery. Available online 24/7 and refreshed within a 12-month period, One Atlas provides customers with easy access to cost effective, high-quality and homogeneous imagery. This streamed basemap facilitates the sharing of data across teams or partner organizations, with no compromise on security or privacy.
- "Yandex.Maps proposes detailed maps of most countries, and satellite layer," said Andrey Strelkov, Yandex's head of geolocation products. "Access to the up-to-date, high-quality images of the One Atlas platform will help us to regularly improve our geo-services."
- Valery Barinberg, Scanex General Director, said: "This new agreement reinforces the long-term collaboration between our companies and brings together two organizations, Airbus and Yandex, well known for delivering quality content, expertise and innovation to the world. It was a group effort and we are excited to be a part of this team."
Overview of handling practices after purchase by Azercosmos
Airbus Defence and Space continues to provide full access to the SPOT -6 and -7 capacities and delivers unchanged commercial service to our customers worldwide.
• SPOT-6 and -7 are still operated as a true constellation on the same orbit and phased 180º from each other. The daily revisit capacity on any point on the globe is guaranteed.
• Preferred distribution area (not exclusive) for the distribution of SPOT -6 and SPOT -7 data by Azercosmos is defined among Caucasus and CIS (Commonwealth of Independent States - part of former Soviet Union) countries. Airbus DS continues to be the distributor of both SPOT -6 and SPOT -7 data for the rest of the world.
• Each party manages independently its customer's tasking requests for both SPOT -6 and SPOT -7 and manages in particular all the high priority requests over its preferred distribution region. Priority requests outside of the region of responsibility are managed in coordination with the other party to define the best scenario to serve efficiently all customers' demands.
• On a case by case basis, exchange of imagery is possible and coordinated between Airbus DS and Azercosmos.
Note: SPOT -7 is marketed by Azercosmos under the name of Azersky, and remains unchanged for Airbus Defence and Space's customers, i.e. SPOT-7.
March, 2017: The Azersky satellite and its payload (former SPOT-7 mission) of Azercosmos is operating nominally. 32)
• Starting in February 2017, Airbus DS is offering new geometric and radiometric processing options available for SPOT and Pléiades imagery including: Projected, Reflectance and Display options. These options were released through every ordering channel including Customer Service and GeoStore. 33)
• September 2016: The Kiribati archipelago is made up of 33 atolls, reef islands and one raised coral island. SPOT 6/7 acquired this image of one of the central Pacific islands on 29 September 2015. The islands of Kiribati are spread over 3.36 million km2 of ocean and have a population of just over 100,000 people. One of the only countries in the world to sit in all four hemispheres, Kiribati is one of the most vulnerable to the effects of climate change, where rising sea levels have the potential to be devastating to these islands. 35)
• Feb. 2, 2016: The image of Figure 17, acquired on 9 January 2015, shows the municipality of Ngambè Tikar, in Cameroon. Forest and savannas spread across this region, which is located in the central area of the country, on the Tikar plain. Thanks to the high levels of rain and humid climate the region experiences, it is an important area for agriculture in Cameroon. 36)
• August 18, 2015: The SPOT-6 and SPOT-7 DRS (Direct Receiving Station) installed at the SANSA (South African National Space Agency) premises by Airbus Defence and Space, has allowed to cover the entire country (1 221 000 km2) at 1.5 m resolution in just 3 months. The DRS has been upgraded in 2014 to receive the SPOT-6 and SPOT-7 data. 37)
• April 15, 2015: Since late 2011, when the Pleiades-A satellite was launched from Kourou, GN&C equipment built by Airbus Defence and Space Electronics have allowed Earth Observation missions to become more efficient. Following Pleiades-A, three additional satellites, Pleiades-B, SPOT-6 and SPOT-7 were launched, each with agility capabilities, based on CMG (Control Moment Gyroscope) technology. With four satellites in-orbit, cumulative life time has reached more than 35 years. Based on the CMG technology, Airbus Defence and Space now develops the NEWTON agility package family of subsystems which allows customers to easily implement actuators. 38)
- The NEWTON family of products are designed for a wide range of satellite platforms, from 500 kg to even more than 2000 kg. The mechanical actuators of these packages are all derived from the flight proven 15-45 CMG successfully used on the Pleiades and SPOT Earth Observation missions.
• April 10, 2015: The SPOT-1 to 5 mission archive, the SPOT-6 and -7 mission archive and new acquisitions, the Pleiades mission archive and new acquisitions, and the SPOTMAPS 2.5 complete dataset are now available to the scientific user community. 39)
- The products are available in level 1 and level 3 (levels 1A/1B and orthorectified level 3 for SPOT-1 to -7, primary and orthorectified levels for Pleiades). Stereo and Tri-Stereo modes available on SPOT-6 and -7 and Pleiades are also available.
- The products can be made available for free through a project proposal submission via the SPOT information area and the Pleiades information area on ESA's Earth Online Portal.
ESA is offering free of charge for scientific research and application development access to the following SPOT collections: 40)
- ESA SPOT archive collections (ESA online archive)
- Archived SPOT-1 to -5 all production levels (on demand)
- Archived and new SPOT-6 & -7 (acquisition modes: single ,stereo or tri-stereo) all production levels (on demand and standard service for tasking)
- SPOTMaps 2.5 m complete dataset (on demand).
SPOT 1-5: CNES
First launch: 22 February 1986
SPOT 1-5: 832 km
Repeat cycle, spatial resolution, swath width
26 days, from 20 m to 1.5 m, 60 km
Onboard sensors provided under ESA's TPM (Third Party Mission) program
HRV, HRVIR, HRG and NAOMI
All of the SPOT satellites provide imagery in panchromatic and multispectral bands with a swath of 60 km. SPOT-6 and SPOT-7, will assure data continuity through to 2024.
• December 2, 2014: With the commercial launch of SPOT-7, the Airbus Defence and Space's optical satellite constellation is now complete, offering a uniquely comprehensive combination of resolution and coverage. A strategic cooperation agreement has just been signed with the Azerbaijani satellite operator Azercosmos for SPOT-7 exploitation. 42) 43) 44)
SPOT-7, the Earth-observation satellite designed and built by Airbus Defence and Space, was commercially launched today, making its high-resolution imagery available to all users. Together with SPOT-6, Pleiades-1A & -1B, TerraSAR-X and TanDEM-X, SPOT-7 makes Airbus Defence and Space the first operator in the world to offer customers a full palette of Earth-imaging data spanning multiple resolution and spectral wavelengths.
- The completion of this unique constellation also represents an opportunity for Airbus Defence and Space to establish a new cooperation with the Azerbaijani satellite operator Azercosmos, for a joint use of the SPOT (6 & 7) satellites.
- The contract is a long-term cooperation agreement which includes the transfer of ownership of the SPOT -7 satellite to Azercosmos of Azerbaijan, the provision of a ground segment for the exploitation of the satellite and a sound training program for operational capacities development. It also encloses a commercial agreement related to the distribution of SPOT-6 and SPOT-7 data to respective customers of both parties.
- As an established player in satellite manufacturing and service provider, Airbus Defence and Space is pleased to work with Azerbaijan to build its ambitious Space Program. This collaboration is an opportunity for Azercosmos to build up its own life experience both in operating a satellite and in serving commercial market immediately.
- Dec. 2, 2014: Within the strategic cooperation framework between Azerbaijan and France in the space industry, "Azercosmos" OJC, national satellite operator of Azerbaijan, signed a strategic cooperation agreement with Airbus Defence and Space to take over the rights to operate and commercialize the SPOT -7 high resolution (1.5 m imagery products) optical Earth observation satellite, which was successfully launched on June 30, 2014 and to be renamed as Azersky. The agreement, which is an important step in the development of relations between Azerbaijan and France, was signed at Bakutel 2014 Telecommunications and Information Technologies Exhibition. 45)
- The long term strategic cooperation between the two parties also includes joint operations of Azersky of Azercosmos and the SPOT- 6 high resolution (1.5 m imagery products) optical Earth observation satellite of Airbus Defence and Space in a constellation to provide superior service. Moreover, the ground segment to be constructed will allow Azercosmos to access images acquired from Pleiades-1A and -1B, very high resolution (0.5 m imagery products) optical Earth observation satellites commercialized by Airbus Defence and Space. This satellite constellation opens up opportunities for many applications, providing the latest images within an unprecedented time frame. The combined acquisition capacity of Azersky and SPOT-6 is equal to six million km2 per day – an area ten times the size of France. This means that every day, every point on the globe can be viewed in high-resolution by the Azersky and SPOT-6 satellites.
- Azersky has a broad range of applications including but not limited to defense and security, emergency response, exploration of natural resources, maritime surveillance, sea faring, environmental protection, urban planning, cartography, agriculture, and tourism. During the next 1.5 years, more than 25 Azerbaijani professionals will be trained in France on optical satellite operations, product development, sales, and marketing of Geo-Information services. This agreement also marks Azercosmos' entry into the commercial business of Earth observation services, including Geo-Information services. This will strengthen Azerbaijan's position among the limited number of countries rendering satellite services.
• Oct. 1, 2014: SPOT -7 has already completed several major milestones of the calibration phase, which confirmed the excellent image quality performances. Since August 5, 2014, images collected are added to the catalog. The start of commercial operations will take place in just a few weeks. Together with SPOT- 6 and Pleiades- 1A/1B, SPOT -7 will open up opportunities for new applications, providing the fresh images within an unprecedented time frame. 46)
• July 4, 2014: First images from the SPOT-7 satellite were acquired within three days after launch. The SPOT- 6/7 constellation is now in place and considerably improves the capabilities and performance offered by SPOT-5, which has been in operation since 2002 and which is scheduled to be decommissioned from commercial service during the first quarter of 2015. This new constellation offers a higher resolution, greater programming reactivity and a much higher volume of images acquired daily (in monoscopic or stereoscopic mode). The first sample images of SPOT-7 are shown in Figures 19 and 20. 47)
• June 30, 2014: The SPOT-7 satellite separated from the rocket 18 minutes after launch and went into a 660 km orbit; the other four secondary satellites were deployed over the next two minutes, according to ISRO (Indian Space Research Organization). 48)
• May 2014: The flash memory Solid-State Recorder (SSR) of Airbus Defense and Space has exceeded 20 months of operation in orbit onboard SPOT-6, the first commercial satellite to deploy this technology. Flash Solid-State Mass Memory provides far greater storage capacity at a lower operating cost than SDRAM. The advantages have been confirmed on SPOT-6 where the flash SSR has a flawless track-record in an Earth observation mission. This new flash SSR device of Airbus Defense and Space has achieved both NASA and ESA qualification standards. 49)
• The SPOT-6 spacecraft and its payload are operating nominally in 2014. SPOT-6 is delivering products in the frame of major European programs [Copernicus, MARS (Monitoring of Agriculture with Remote Sensing)] and International Charter Space & Major Disaster. 50)
• A SPOT-6 geometric accuracy assessment was performed on three levels: 51)
- Use of the Landsat IAS (Image Assessment System): developed for radiometric and geometric characterization and calibration of Landsat data.
- Band to Band (B2B) assessment: B2B is performed to test band alignment of the image data; it is typically done by registering each band against every other band.
- Image to Image (I2I) registration assessment tool: I2I is usually performed to compare the relative accuracy between two images.
• Excellent location accuracy of the SPOT-6 imagery was already confirmed at commissioning: 19.3 m CE90 @30º; this is nearly two times better than the satellite requirement (35 m CE90 @30º). These measurements were conducted during the commissioning phase (Sept-Dec 2012). 52)
- The current performance (March 2014) after one year of refinement and temporal drift calibration (Oct 2013) is nearly three times better than satellite requirement: 11.9 m CE90 @30º.
- Focal plane calibration and planimetric accuracy assessment.
Planimetric accuracy: Residual error of all Line Of Sight contributors after geometric model reset on a Ground absolute reference:
- Assessment on reference site, image auto calibration (cross acquisition)
- Reference sites: correlation on nearly perfect reference sites covering the full swath
- Supersites of Toulouse (France), Bouches du Rhône (France), Napier (New Zealand)
- XY accuracy <0.2 m ; Z accuracy<0.3 m.
Auto calibration without reference site:
- Cross acquisition of 2 images (or more) on a same orbit, viewing the same site with opposite viewing angles of 90º
- Correlation of image couple gives static and dynamic residues along lines and columns.
• Oct. 2013: The remarkable agility of SPOT-6 (and -7) not only benefit to the global acquisition capacity. They also enable performing a prodigious variety of acquisition scenarios in a single satellite pass. Whatever the need of the user is, the system can equally collect (Ref. 17):
- A multitude of individual scenes in a reduced theater (typically 11 within a 1 000 km long orbit slot, (Figure 23 left)
- Long strips (typical acquisition mode for SPOT 6 and 7, with max length being 600 km, (Figure 23 center)
- Contiguous strips (e.g. to cover an area of 330 km x 300 km, that can be then automatically mosaicked and orthorectified in the ground segment (Figure 23 right).
- And also stereo collection for 3D models computation and mapping edition up to 1 / 15 000. The agility is even enabling easily the acquisition of a third image at nadir, then performing tri-stereo: in addition to collecting two oblique images looking forward and backward over an AOI as SPOT-5 did, each new satellite can pivot fast enough to acquire a third vertically over the target. This nadir image in the tri-stereo dataset vastly enhances the quality of elevation data extracted from the stereo images. Indeed, in standard two-image stereo products acquired over steep terrain or dense metropolitan areas, low-lying features may be hidden from view in the oblique perspective by high mountains or tall buildings. In tri-stereo, the nadir image peers straight down into the natural or man-made valleys to capture all features and ground surfaces, resulting in more complete and accurate DEM (Digital Elevation Model) datasets (Ref. 17).
The resolution is not the only element determining the gains in terms of appearance, sharpness and image quality. Another great improvement with SPOT- 6 /-7 is the 12 bit pixel depth. For each spectral band, it means that each pixel can take one value out of 4 096. SPOT-5 has a pixel depth at acquisition of 8 bits, so a given pixel can take one value out of 256, thus displaying less capacity when distinguishing subtle nuances, especially in the beginning or the end of the spectrum:
- It is more likely with SPOT-6 to detect objects in the darkness of the shadow of a building or a mountain, as more nuances can be taken by each pixel
- Similarly, it is easier to detect pale-colored elements in very light / bright environments (sand, ice, nearly-white ground), according to the same principle, as more saturation problems are avoided.
Another significant improvement of SPOT-6 /-7 compared to SPOT-5 is the intrinsic geolocation accuracy of the collected images. Thanks to a new generation of Attitude and Determination and Control Subsystem (ADCS), the actual performance measured on SPOT-6 image primary products, i.e. without use of ground control point, is better than 20 m CE90 and even 10 m for the automatic orthos. With such a performance, entire country maps can be updated for scales of 1:25 000 and even 1:15 000 (Ref. 17).
• July 2013: SPOT-6 has successfully passed all tests conducted by the Joint Research Centre (JRC), the European Commission's in-house science service, and has been contributing to the MARS-CAP (Monitoring Agricultural ResourceS-Common Agricultural Policy) program since July 1, 2013. MARS-CAP is the European program surveying agricultural land by satellite within the framework of the Common Agricultural Policy. 54)
Following qualification, SPOT-6 joined the other Astrium-operated satellites, SPOT-5, Pleiades-1A and Pleiades-1B, on the program on July 1, as part of the 2013 MARS-CAP campaign. Initiated by the European Union in 1993, the MARS-CAP campaigns involve mapping agricultural land throughout Europe to verify declarations relating to cultivated land areas and fallow land submitted by farmers. The European subsidies granted to farmers are based on these declarations and their verification.
SPOT- 6 brings new performance levels to the MARS-CAP program, including heightened resolution (1.5 m), the blue spectral band (to acquire images directly in natural colors), enhanced localization of images and unequalled agility, enabling extensive areas to be mapped in record time. - Astrium Services has been working alongside the European Commission for 20 years to help implement the Common Agricultural Policy.
• In the first quarter of 2013, SPOT-6 collected imagery covering 152 million km2; 300 million km2 have been collected since launch. 55)
• Jan. 2013: Bamako, Mali, is located on the Niger River in Africa, which can be seen in the upper section of Figure 25. The river passes through much of Mali and ultimately discharges into the Atlantic Ocean from Nigeria. The city spans both sides of the river and three bridges connect the city. - This image is a SPOTMap 1.5 product produced by Airbus Defence and Space, that aims to provide imagery ideally suited to mapping and planning purposes.
• Coverage of Mali: In 2011, the Mali Cartographic Institute had issued an RFP (Request for Proposal) to cover the entire country, 1,250,000 km2 with no sand wind and no cloud. The first strategy was to leverage 2-year old SPOT -5 archive, trying to fill in the gaps with new SPOT-5 acquisitions. But SPOT-5 mirrors were not enabling the acquisition of contiguous segments, thus limiting the progress at each pass. For over a year, the campaign remained uncompleted (Ref. 17).
On October 17, 2012, a month and a half after its launch, SPOT-6 was added to the campaign to rescue and close up the coverage. The first performances were breathtaking, so the tasking team decided to switch the entire country to SPOT-6. On March 15, 2013, - only 5 months after kicking off the tasking request - 100% was completed on spec and on time. This exploit is even more striking since conflicting with another campaign, started the same October 17 over Senegal: even not all the resources of SPOT-6 had been allocated to Mali .... Full Senegal was cleared on March 12, 2013. Imagine the coverage speed once SPOT-7 is there!
• In mid-January 2013, SPOT-6 was officially declared "good to go" (i.e., operational) after the recent completion of technical commissioning. All satellite functions and performance are nominal, in some cases even exceeding specifications. The sensor's agility has been thoroughly tested; with scenarios including imaging large areas in a single pass (e.g. 500 km x 150 km), consecutive long strip acquisitions (e.g. 1500 km in 3 North-South segments) and target acquisitions (e.g. more than 15 scenes -60 km x 60 km- over a same point in one pass). 56)
The system is now fully operational, with daily acquisitions averaging very close to the maximum capacity of 3 million km2. The system has successfully downlinked images on 4 passes over the Toulouse station and 8 passes over the Kiruna station. In the last 2 months, SPOT-6 imaged more than 100 million km2 without even operating at full capacity! System operation is now fully managed by Astrium GEO-Information Services with the support of Astrium Satellites for control of the satellite.
• In October 2012, Astrium Services and the Istanbul Technical University (ITU) signed two agreements in Istanbul , to develop high-resolution and large-area coverage services in Turkey, notably for agriculture. The agreements cover a SPOT New Generation receiving station and reception of data from SPOT-6 and SPOT-7, as well as an extension for SPOT-5 data. 57)
• On Sept. 22. 2012, SPOT-6 reached its final orbital slot. A review of this initial positioning phase was successfully completed on October 12, 2012. The review also included an exhaustive analysis of the in-orbit status of the satellite's subsystems. All systems have been powered up and are functioning nominally. Fuel consumption has been tightly controlled, commensurate with the satellite's planned 10-year operating lifetime.58)
• Sept. 12, 2012: Three days after launch, SPOT-6 acquired its first image of the Bora Bora atoll (French Polynesia), part of the Society Islands in the Pacific Ocean. The pansharpened image (Figure 27) has a resolution of 1-5 m 59) 60)
Legend to Figure 27: Bora Bora is an atoll island in the wind which means "first born." The island is surrounded by a large lagoon and a fringe of coral reef. The center is occupied by an extinct volcano.
NAOMI (New AstroSat Optical Modular Instrument)
NAOMI is a product line of high-resolution imagers designed and developed at EADS Astrium SAS. Several versions of the NAOMI instrument have already been developed with a GSD from 1.5 m to 2.5 m, and swath widths from 10 km up to 60 km. All of them are based on the same telescope concept implementing one or several focal planes units in the same camera, and even two cameras in the same instrument as for the SPOT-6 & SPOT-7 program.
NAOMI instruments can be embarked on small platforms (Myriade class) or larger platforms (Astrosat-250). The IEU (Instrument Electronics Unit) can accommodate internal mass memory functions or can be coupled with high capacities mass memories like CORECI equipment also developed by Astrium SAS.
The main building blocks of the instrument are: 61)
• A highly stable, light and compact telescope built in SiC material, with a simple thermal control.
• A focal plane, embedding TDI (Time Delay Integration) detector, a PAN CCD and four XS (multispectral) detectors equipped with strip filters and coupled with front end electronics. The TDI implementation exhibits an outstanding MTF (Modulation Transfer Function) servicewith an extremely low power consumption. This allows significantly loosening of optical requirements at the telescope level, while keeping the same overall optical quality at system level; in other words, the same optical quality can be reached from smaller and much lighter telescopes. Therefore more performance can be obtained from smaller satellites.
• Back-end electronics, including video Electronics, data storage and services adapted to the mission specificities. The modular video chains are capable of operating at different frequencies up to 15 Msample/s, so that the same hardware can be easily tuned to serve ground resolutions ranging from 0.5 m to say 10 m. The swath width can easily be adjusted by butting together several detectors and associated modular video chains, thus fulfilling the requirements of the most demanding customers.
The telescope is based on a Korsch combination, offering a simple, compact concept. The detector, space qualified, includes on the same die one TDI matrix of 7000 pixels for the panchromatic channel, and four lines of 1750 pixels for the multispectral bands. The detector exhibits excellent characteristics that significantly contribute to the instrument very high optical performance.
The optical assembly is based on a Korsch-type telescope including three aspheric mirrors and two folding mirrors.
The detection chain is made of three main parts: the detectors, the Front End Electronics Module (F2EM) and the Video Electronics (MEV) which are part of the IEU (Imaging and Electronics Unit). The PAN + XS focal planes are the heart of the detection chain.
Focal plane is based on a customized high performance detector architecture developed by e2v for Astrium (proprietary architecture). It takes benefit of all the heritage and skills acquired in CCD architecture definition and in operating with the ultimate conditions of speed and performances. The result of this customization offers an unrivalled level of integration and performances. All the stringent constraints of dynamic range optimization and power consumption reduction have been mastered with less than 1 watt detector dissipation.
The Front-End Electronics Module (F2EM) encompasses all the functions to be implemented close to the detectors. Mounted inside the FPA (Focal Plane Assembly), it provides the detectors with all the necessary biasing and clocking signals and performs preamplification and transmission of the video signal to the MEV.
The MEV (Module Electronique Video) is the backend part of the NAOMI detection electronics. The MEV provides the F2EM with the primary power supplies and clocks necessary to front-end operation. The video signal from the F2EM is received, adapted and digitally converted to 12 bit in the MEV. The resulting data, rounded down to 10 useful bits, are then transmitted to the digital functions of the NIEU to be real-time processed and stored into the mass memory for further downlink.
- Korsch telescope in SiC (Silicon Carbide)
Spectral band (Pan)
MS (Multispectral bands), 4
Blue: 0.45-0.52 µm
GSD (Ground Sample Distance)
PAN: from 1.5 m to 2.5 m at nadir
N x silicon area arrays with 7000 pixels PAN, 1750 pixels in each MS band
TDI (Time Delay Integration)
The PAN band offers TDI services for SNR improvement of the signal
- From 10 km to 60 km at nadir depending on GSD and number of detectors 63)
FOR (Field of Regard)
±30º (spacecraft tilting capability about nadir for event monitoring)
Data quantization (dynamic range)
Legend to Table 4: For a given mission, the swath is fixed (60 km for SPOT-6/-7). The range from 10 to 60 km features the swath value for different missions using a NAOMI instrument. 62)
The same logic applies to the variable parameter of GSD in Table 4: The GSD is fixed for a particular mission (the ranges feature the values for different missions using a NAOMI instrument). For SPOT-6/-7, the GSD for PAN = 2 m and for MS = 8 m.
The overall control ground segment architecture is based on a well-mastered and efficient design which has been used and improved on several Astrium export programs - like the ground segments for the missions: THEOS (Thailand), AlSat-2 (Algeria), and SSOT (Chile). 63) 64)
The SPOT-6/-7 (AstroTerra) architecture comprises a ground segment divided into two major parts:
• The CGS (Control Ground Segment), in charge of controlling, commanding and monitoring the SPOT-6 and SPOT-7 satellites on their orbit, and maintaining the orbit. The objective of CGS is to gather all the requested means for managing the satellite configuration and for supporting the satellite maintenance.
• The EGS (Exploitation Ground Segment), in charge of programming the satellite mission plan and ingesting the image data and processing it in order to produce, archive and deliver the SPOT-6 and SPOT-7 image products.
The CGS is connected to a full scale S-band service, providing access to one or several S-band stations for telemetry and telecommand data exchanges with the SPOT-6 and SPOT-7 satellites. This S-band service will include at least one polar station, so as to provide maximum access to the satellites.
The AstroTerra system is composed of:
• The Space Segment in charge of collecting the imagery data and including :
- Spot 6 and Spot 7 observation satellites operating on a Low Earth Orbit
- The AstroTerra Control Ground Segment, located at the Astrium Satellite premises, Toulouse, France
• The customer Operator Segment also called Exploitation Ground Segment made of:
- A network of AstroTerra DRS (Direct Receiving Stations)
- An AstroTerra Polar Center, located in Kiruna, Sweden
- The AstroTerra Operator Center located in customer premises at Toulouse, France.
Instead of procuring one or two ground stations for commanding and controlling the satellites, the AstroTerra program has decided to rely on a S-band service, contracted to the Swedish Space Corporation. This service will provide access to one or several S-band stations in Kiruna and Inuvik for telemetry and telecommand data exchanges with the SPOT-6 and SPOT-7 satellites.
The main external interfaces of the CGS (Control Ground Segments) are:
• The reception of satellite mission plan from the EGS (Exploitation Ground Segment) and the distribution of orbital information, satellite status and mission follow-up to the EGS.
• The reception of external time reference to synchronize all subsystems
• The link to the S-band service
• The distribution of operational alarms (SMS / email)
• The link to a space debris collision risk evaluation service (provided by CNES, the French space agency)
• The link to the encryption device keys manager
• The link to the satellite simulator.
The solution designed for AstroTerra Control Ground Segment relies on software products developed by Astrium. MOSAIC, is a new software product developed in the frame of the AstroTerra project. MOSAIC has now become part of the Control Ground Segment product line. AstroTerra has integrated the following products:
• Control Command: OPEN CENTER
• Flight dynamics: QUARTZ++
• System database : SIS (Satellite Information System)
• Centralized logbook: C-LOG
• Interface adaptation and automation: MOSAIC
• Off-line Telemetry Trend Analysis : TELMA
The EGS (Exploitation Ground Segment) is built to be fully automatic for processing routine daily tasks. As a consequence, the Mission Plan and the Satellite Mission Commands Plan uploading are designed to be carried out without human intervention.
Operations: With SPOT-6 and SPOT-7, Astrium Satellites will for the first time operate commercial Earth observation satellites. Astrium benefits from the knowledge of the control ground segment and, naturally from intimate mastership of the operations requirement of its own satellites. However, setting up the operations of the ground control center has required defining and implementing infrastructure requirements, operations approach, staffing strategy, which are usually only specified by Astrium and implemented by its customers.
Airbus Defence and Space Ground Station Network for Near Realtime Data Access Services
• Direct Receiving Station (of GeoNorth in Fairbanks, Alaska, since June 2014). Airbus Defense and Space and its client GeoNorth have inaugurated the first commercially available multi-satellite Direct Receiving Station (DRS) in the world, set to give a host of new markets quick access to both high-resolution and very high-resolution optical and radar satellite imagery. 65)
- The DRS in Fairbanks draws on SPOT (-5 , -6, and -7), Pleiades (-1A and -1B), TerraSAR-X and TanDEM-X satellites - with resolutions across optical and radar products ranging from 0.25 m to 40 m.
- The GeoNorth DRS is set to bring in a wider range of clients and contracts for both companies given that GeoNorth is an Alaska Native Corporation - a status that among other benefits gives it procurement preference in the US. The new DRS will have applications for the North American market, in particular for major business areas in Alaska, including: oil, gas and mining; infrastructure development; fisheries and ice monitoring.
• Airbus Defence and Space and KSAT (Kongsberg Satellite Services) have signed a multi-million-euro agreement for the delivery and installation of a DRS (Direct Receiving Station) for TerraSAR-X and its twin satellite TanDEM-X in Norway. Through data reception at KSAT's premises in Svalbard and processing in Tromsø, this system – scheduled to be operational by the end of 2014 – will support a globally unique near real-time capability that will in particular significantly enhance maritime monitoring services. 66)
- Airbus Defence and Space will equip KSAT with one of the first of its multi-mission DRSs. Initially, the station will receive and process data from TerraSAR-X and TanDEM-X. However, KSAT will also have the option of drawing on Airbus Defence and Space's entire satellite constellation, including the Pleiades twins, SPOT 6 and the upcoming SPOT 7, as well as the future PAZ (owned and to be operated by Hisdesat).
- Access to this northernmost receiving station will provide Airbus Defence and Space customers with improved near real-time services particularly valuable for regular monitoring applications. In parallel, KSAT will now be able to widely distribute TerraSAR-X/TanDEM-X SAR data to develop new and enhanced services on a global basis.
Geo-Information Services of Astrium
• Dec. 2012: With more than 50 direct receiving stations operating on all five continents, Airbus Defence and Space has the most extensive station network in the world today. Imagery is downlinked instantly from the optical and radar satellites operated by Airbus Defence and Space each time they pass over these stations, making it possible to deliver fresh information from any area of interest very quickly. New SPOT-6, SPOT-7 and Pléiades receiving stations are set to further shorten image data delivery times, getting data into the hands of users faster than ever before (Ref. 58).
• Spot Image and Infoterra joined forces within Astrium Geo-Information Services to offer a consolidated product and services portfolio under the Astrium brand. The merger took place in May 2010. On January 1, 2011, a single operational management structure was implemented. 67)
A single operational management structure started on January 1, 2011, bringing closer together the satellite imagery and geoinformation specialists Spot Image and Infoterra to form the GEO-Information division of Astrium Services. As a global, integrated company, the GEO-Information division of Astrium Services is implementing this new organization with a single vision in mind: to better respond to the needs of customers.
The GEO-Information Services division will offer:
• a one-stop shop for data from the SPOT and TerraSAR-X satellites, and from Pleiades
• a single product and services portfolio covering the entire geographic information value chain from satellite imagery to value-added services and turnkey solutions.
ERMEX receiving station: In the spring of 2012, Astrium Services signed an agreement with the government of Mexico to upgrade the ERMEX receiving station south of Mexico City. This station will enter service in September 2012. Equipped with a high-tech antenna and a new-generation SPOT terminal, it will initially receive SPOT-5 imagery and then SPOT-6 imagery when commercial operations get underway. It will also receive data from SPOT-7 in 2014. 68)
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2) Philippe Campenon, "Pleiades and SPOT-6: Earth observation in high and very high resolution," Proceedings of the 60th IAC (International Astronautical Congress), Daejeon, Korea, Oct. 12-16, 2009, IAC-09-B1.2.6
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19) Michael Stähle, Tim Pike, "ADCSS 2012 Astrium - Current and Future Mass Memory Products," Proceedings of ADCSS (Avionics Data, Control and Software Systems) Workshop, ESA/ESTEC, Noordwijk, The Netherlands, Oct.23-25, 2012, URL:
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23) "Launch of SPOT 7 completes Airbus Defence and Space observation satellite constellation," Airbus Defence and Space, June 30, 2014, URL: http://www.space-airbusds.com/en/press_centre/launch-of-spot-7-completes-airbus-defence-and-space-observation-satellite.html
24) Patrick Blau, "India's PSLV Rocket successfully delivers SPOT-7 & Small Satellites to Orbit," Spaceflight 101, June 30, 2014, URL: http://www.spaceflight101.com/pslv-c23---spot7-launch-updates.html
25) "PSLV-C23 brochure," ISRO, URL: http://www.isro.org/pslv-c23/pdf/pslv-c23-brochure.pdf
26) "AISat satellite transmits from space," DLR, June 30, 2014, URL: http://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10081/151_read-10812/year-all/#/gallery/15477
27) "Airbus to provide near real-time access to its satellite data," Airbus Press Release, 30 Jan. 2018: URL: http://www.airbus.com/content/dam/corporate-topics/publications/press-release/Press%20Release%20CIS%2030012018%20ENG.pdf
28) "SPOT 6/7 Farming Just Got Better with Improved Satshot Mapping Imagery and Airbus," Satnews Daily, Aug. 28, 2017, URL: http://www.satnews.com/story.php?number=613604642
29) "SPOT 6/7 imagery for improved efficiency of US agriculture," GeoConnexion, Aug. 28, 2017, URL: http://www.geoconnexion.com/news/spot-6-7-imagery-for-improved-efficiency-of-us-agriculture/
30) "Airbus and Scanex to feed Russia's most popular search engine Yandex with "One Atlas" satellite imagery data," Airbus DS, May 24, 2017, URL: https://airbusdefenceandspace.com/newsroom/news-and-features/airbus-and-scanex-to-feed-russias-most-popular-search-engine-yandex-with-one-atlas-satellite-imagery-data/
31) Information provided by David Golden, 3D Optical and SPOT Product Manager, Communications, Intelligence & Security, Airbus Defence and Space, Toulouse, France.
32) Information provided by Eldaniz Aliyev, and Fidan Behbudova of Azercosmos OJSC (Open Joint Stock Company), Baku, Azerbaijan.
33) "New Processing Options for Pléiades and SPOT 6/7 Products," Airbus DS, Feb. 2017, URL: http://www.intelligence-airbusds.com/en/7717-new-processing-options-for-pleiades-and-spot-67-products
35) "SPOT 6/7 eyes the Kiribati Republic," Sept. 2016, eoPortal, URL: https://www.intelligence-airbusds.com/en/5751-image-gallery-details?img=38259#.Y3Ntz3bMKUk
36) "Ngambè Tikar, Cameroon," Airbus DS, image of the week, Feb. 2016, URL: https://www.intelligence-airbusds.com/en/5751-image-gallery-details?img=38259#.Y3Ntz3bMKUk
37) "SPOT 6/7 Complete Coverage Over South Africa in Just 3 Months," Airbus DS, Aug.18, 2015, URL: http://www.geo-airbusds.com/en/6754-spot-67-complete-coverage-over-south-africa-in-just-3-months
38) "Airbus Defence and Space NEWTON products enable agile satellite missions," Airbus DS, April 15, 2015, URL: http://www.space-airbusds.com/en/press_centre/airbus-defence-and-space-
39) "SPOT and Pleiades data available for research and application development," ESA, April 10, 2015, URL:
40) "Third Party Mission - Welcome to the SPOT Information Area," ESA, URL: http://tinyurl.com/qa8ztqp
42) "Airbus Defence and Space announces the Commercial Launch of SPOT 7 satellite," Airbus DS Press Release, Dec. 2, 2014: http://www.satcom-airbusds.com/wp-content/uploads/2014/12/cis-76-2014-n-02122014-eng.pdf
43) Peter B. de Selding, "Airbus Sells In-orbit Spot 7 Imaging Satellite to Azerbaijan," Space News, Dec. 4, 2014, URL: http://spacenews.com/42840airbus-sells-in-orbit-spot-7-imaging-satellite-to-azerbaijan/
44) "Azercosmos OJC to operate SPOT 7 high resolution optical Earth observation satellite," Dec. 2, 2014, URL: http://en.trend.az/azerbaijan/society/2339323.html
45) "Azercosmos" OJC to operate and commercialize SPOT-7 high resolution optical Earth observation satellite, to be renamed as Azersky," Dec. 2, 2014, URL: http://azercosmos.az/azercosmos-ojc-to-operate-and-commercialize-spot-7-high-resolution-optical-earth-observation-satellite-to-be-renamed-as-azersky
46) "SPOT-7 In-Orbit Testing Runs Smoothly," Airbus Defence and Space, URL: http://www.geo-airbusds.com/en/6017-spot-7-in-orbit-testing-runs-smoothly
47) "First images from SPOT 7 satellite within three days after launch," Airbus Defence and Space, July 4, 2014, URL: http://www.astrium-geo.com/en/5928-first-images-from-spot-7-satellite-within-three-days-after-launch
48) K. S. Jayaraman, "India's PSLV Rocket Lofts Airbus Spot 7 Satellite," SpaceNews, June 30, 2014, URL:
49) "Fully qualified Flash Memory optimizes Satellite Data Storage," Airbus Defence and Space, May 19, 2014, URL: http://www.astrium.eads.net/en/press_centre/fully-qualified-flash-memory-optimizes-satellite-data-storage.html
50) Information provided by Jérôme Soubirane, SPOT Product Manager, Geo-Intelligence, Airbus Defence and Space, Toulouse, France.
51) Ajit Sampath, Dong Han Lee, "A look at Pleiades 1-B and SPOT data," Proceedings of JACIE 2014 (Joint Agency Commercial Imagery Evaluation) Workshop, Louisville, Kentucky, USA, March 26-28, 2014, URL: https://calval.cr.usgs.gov/wordpress/wp-content/uploads/14.003_Sampath_Pleiades_SPOT_JACIE20141.pdf
52) Brian Cutler, "Pléiades 1B and SPOT 6 Image Quality status after commissioning and 1st year in orbit," Proceedings of JACIE 2014 (Joint Agency Commercial Imagery Evaluation) Workshop, Louisville, Kentucky, USA, March 26-28, 2014, URL: https://calval.cr.usgs.gov/wordpress/wp-content/uploads/14.025_Cutler_JACIE2014-Airbus-Constellation-PHR1BSPOT6.pdf
53) "SPOT-6 1.5m Ortho Pan-sharpened (12 bits) sample imagery," URL: http://www.astrium-geo.com/en/23-sample-imagery
54) "Astrium's satellites qualified by the European Union within the framework of CAP," Astrium, July 18, 2013, URL: http://www.astrium.eads.net/en/press_centre/astrium-s-satellites-qualified-
55) Drew Hopwood, "Pleiades-1A and -1B, SPOT-6 & -7 — Status of Astrium GEO-Information Services' EO Satellite Constellation," 12th Annual JACIE (Joint Agency Commercial Imagery Evaluation) Workshop, St. Louis, MO, USA, April 16-18, 2013, URL:
56) "SPOT 6 Completes Technical Commissioning," Astrium Services, January 2013, URL: http://www.astrium-geo.com/na/4589-spot-6-completes-technical-commissioning
57) "SPOT 6 & 7 - Turkey Steps up Collaboration with Astrium Services," Astrium Services, Dec. 20, 2012, URL: http://www.astrium-geo.com/en/4582-spot-6-7-turkey-steps-up-collaboration-with-astrium-services
58) "Positioning Status Report," Astrium, URL: http://www.astrium-geo.com/na/4515-spot-6-success-story-2
59) Astrium Services, Sept. 12, 2012, URL: http://www.astrium-geo.com/en/19-gallery?img=12518&search=gallery&type=0&sensor=0&resolution=0&continent=0&application=0&theme=0
60) "First Images from SPOT 6," Astrium Services, Sept. 13, 2012, URL: http://www.astrium-geo.com/na/4423-first-images-from-spot-6
61) P. Luquet, A. Chikouche, A. B Benbouzid, J. J Arnoux, E. Chinal, C Massol, P. Rouchit(1), S. de Zotti, "NAOMI instrument: a product line of compact & versatile cameras designed for high resolution missions in Earth observation," Proceedings of the 7th ICSO (International Conference on Space Optics) 2008, Toulouse, France, Oct. 14-17, 2008
62) Information provided by Michel Pascal of Astrium Services, Toulouse, France
63) Jean-Michel Dussauze, Alain Gevert, Jacques Troillard, "AstroTerra Control Ground Segment: Cost reduction through automation and product line," Proceedings of the SpaceOps 2010 Conference, Huntsville, ALA, USA, April 25-30, 2010, paper: AIAA 2010-1916
64) Jean-Michel Dussauze, Gérard Feltrin, Jacques Troillard, "AstroTerra Control Ground Segment: Operations concept and implementation," Proceedings of SpaceOps 2012, The 12th International Conference on Space Operations, Stockholm, Sweden, June 11-15, 2012
65) "ADS unveils multi-satellite Direct Receiving Station for GeoNorth," Space Daily, June 26, 2014, URL:
66) "Airbus Defence and Space supplies KSAT with Norway's first TerraSAR-X Direct Receiving Station," Airbus Group, June 26, 2014, URL: http://www.airbus-group.com/airbusgroup/germany/
67) "Astrium fully integrates Spot Image and Infoterra into new GEO-Information business division," Dec. 1, 2010, URL: https://web.archive.org/web/20130403004609/http://www.astrium.eads.net/en/press_centre/astrium-fully-integrates-spot-image-and-infoterra-into-new-geo-information.html
68) "Astrium Installs New Terminal in Mexico to Receive SPOT 6 and 7 Imagery," Astrium, Sept. 4, 2012, URL: http://www.astrium-geo.com/na/4364-astrium-installs-new-spot-terminal-in-mexico
The information compiled and edited in this article was provided by Herbert J. Kramer from his documentation of: "Observation of the Earth and Its Environment: Survey of Missions and Sensors" (Springer Verlag) as well as many other sources after the publication of the 4th edition in 2002. - Comments and corrections to this article are always welcome for further updates (firstname.lastname@example.org).