• Grace Follow-On – building on Airbus Defence and Space’s achievements in environmental and climate satellites
• This key climate mission gives the go-ahead to ensure continuation of the original highly successful Airbus Defence and Space-built Grace satellite mission
• Twin Grace Follow-On satellites to investigate the Earth’s gravity field
Friedrichshafen, 29 November 2012 – Airbus Defence and Space, Europe’s leading space technology company, has been commissioned to build two new research satellites for NASA’s Jet Propulsion Laboratory JPL (Pasadena, California). The agreement was signed today in Friedrichshafen, Germany. For a minimum of five years from August 2017, the Gravity Recovery and Climate Experiment Follow-On (Grace FO) mission will continue the extremely accurate measurement data collection of the first twin Grace satellites, which have been in orbit since 17 March 2002.
Airbus Defence and Space’s Grace satellites have been making a hugely important contribution to global climate research since 2002. Based on their observations of changes in the Earth’s gravity field over time, geoscientists are gaining new insights into the dynamic processes in the planet’s interior, into deep and surface currents in the oceans, and into variations in the extent of ice coverage at the poles, in Greenland and over mountain ranges. The original Grace mission allowed scientists for the first time to identify which masses of water, ice and solid material are moving; Grace is even able to provide long-term observation of water table levels around the world.
Each of the Grace FO satellites measures approximately 3 x 2 x 0.8 metres and weighs around 580 kg. Like their predecessors, they will be placed in a polar orbit at an altitude of some 500 kilometres and follow each other 220 km apart. As they fly, the two satellites constantly and extremely precisely determine the distance between them, which varies under the influence of the Earth’s gravity; this fluctuating distance provides the data for continued measurement of our planet’s gravity field.
The measurements taken by the Grace FO satellites will be exceptionally accurate because their positions will be minutely ascertained using on-board GPS (Global Positioning System) receivers, while a satellite-to-satellite microwave link will enable the exact distance between them to be calculated to within a few thousandths of a millimetre. In contrast to the original Grace mission, the distance between the new satellites will also be measured using lasers – a technological experiment in preparation for future generations of gravity-research satellites.
Throughout the five-year mission, these measurements will be used to generate an updated model of the Earth’s gravitational field every 30 days. In addition, every day each satellite will create up to 200 profiles of temperature distribution and water vapour content in the atmosphere and ionosphere.
With this new two-satellite contract, Airbus Defence and Space in Friedrichshafen is building on the success of its unique series of small satellites. Numerous important scientific missions, such as Champ, GOCE and Swarm, have been based on Airbus Defence and Space’s satellite platform. The Grace satellites, launched in 2002, have now been successfully carrying out their mission for double their nominal five-year service lifetime. Moreover, they were delivered to NASA on time and on budget.
As a leading satellite system specialist, Airbus Defence and Space has extensive expertise and operational mission experience in the field of environmental and climate satellites. Airbus Defence and Space’s prime contractorships in this field include Europe’s largest environmental satellite, Envisat, the ice-observing CryoSat satellite, Aeolus (the first mission to measure wind profiles on a global scale) and EarthCARE (Earth Clouds, Aerosols and Radiation Explorer). Airbus Defence and Space also played a major role in the SMOS (soil moisture and ocean salinity observation) satellite, and has designed and produced a full range of state-of-the-art meteorological satellites (MetOp A, B and C) and payloads (Seviri instrument for Meteosat Second Generation).
For more information about Grace, see: http://www.space-airbusds.com/en/programme/grace.html
To download the animation / footage: www.space-airbusds.com/en/press_centre/broadcast-room.html
About Airbus Defence and Space
Airbus Defence and Space is the number one company in Europe for space technologies and the third in the world. In 2011, Airbus Defence and Space had a turnover close to €5 billion and 18,000 employees worldwide, mainly in France, Germany, the United Kingdom, Spain and the Netherlands.
Airbus Defence and Space is the sole European company that covers the whole range of civil and defence space systems and services.
Its three business units are: Airbus Defence and Space for launchers and orbital infrastructure; Airbus Defence and Space for spacecraft and ground segment; Airbus Defence and Space for comprehensive fixed and mobile end-to-end solutions covering secure and commercial satcoms and networks, high security and broadcast satellite communications equipment and systems, and bespoke geo-information services, worldwide.
Airbus Defence and Space is a wholly owned subsidiary of AIRBUS Group, a global leader in aerospace, defence and related services. In 2011, the Group – comprising Airbus, Airbus Defence and Space, Cassidian and Eurocopter – generated revenues of €49.1 billion and employed a workforce of over 133,000.
Jeremy Close (Airbus Defence and Space UK) Tel.: +44 (0)1438 773872
Gregory Gavroy (Airbus Defence and Space FR) Tel.: +33 (0)1 77 75 80 32
Ralph Heinrich (Airbus Defence and Space GER) Tel.: +49 (0)89 607 33971
Francisco Lechón (Airbus Defence and Space SP) Tel.: +34 91 586 37 41