ESA Awards TRUTH Mission Contract to Airbus
Mission Will Provide a Benchmark of Earth's Energy Balance
A contract for the latest phase in the European Space Agency (ESA) TRUTHS mission, part of ESA’s Earth Observation Earth Watch program, has been awarded to Airbus. The contract covers detailed definition of the mission and payload, and focuses on payload development and de-risking activities with an option for the procurement of long lead time hardware ahead of the full implementation phase following the 2025 ESA Ministerial budget meeting. The contract is worth €109.3 million (≈ $118 million) including options and was signed at COP28 in Dubai.
"TRUTHS will provide the gold standard of calibration for space-based Earth observation – a kind of ‘standards laboratory in space’.”
Jean Marc Nasr, Airbus
The TRUTHS satellite mission will measure the Sun’s radiation and the sunlight reflected off Earth's surface relative to an accurate reference, which will then be used to improve the climatological data sets and calibrate the observations of other satellites. This space-based climate and calibration observing system will enable data from other satellites to be compared more easily providing greater standards of data harmonization for even more accurate climate change forecasts.
"This contract takes us one step closer to building a mission that will enable scientists and climatologists to cross reference their measurements and data enabling much more accurate forecasts and analysis in a shorter time," said Jean Marc Nasr, Head of Space Systems at Airbus. "TRUTHS will provide the gold standard of calibration for space-based Earth observation – a kind of ‘standards laboratory in space’.”
"This UK-led mission will have a global impact, providing invaluable measurements to improve our understanding of climate change," said UK Science, Research and Innovation Minister, Andrew Griffith. "Overseen by Airbus-UK, this work is generating growth and developing important industrial capabilities across our space sector, driving forward our ambitions to make the UK a science and technology superpower.”
TRUTHS stands for Traceable Radiometry Underpinning Terrestrial and Helio Studies. This latest phase will include design definition of the mission and payload as well as commencing the build-up of the Industrial partners required to deliver such a complex payload while establishing optical Earth instrumentation expertise in the UK. This enhanced capability in the UK will enable Europe to benefit from a new skill set for Earth observation satellite missions in the future.
TRUTHS will carry a Cryogenic Solar Absolute Radiometer (CSAR) to provide a primary calibration standard in order to benchmark measurements of both incoming solar radiation and outgoing reflected radiation - measured with a Hyperspectral Imaging Sensor (HIS) also part of the payload - with unprecedented accuracy. These measurements will give the ability to estimate radiative imbalance underlying climate change and, importantly, in a shorter time than is currently possible. TRUTHS will serve to calibrate other satellite sensors, such as those carried on the Copernicus missions, through co-imaging operations.
TRUTHS is funded by a set of ESA member states, led by the UK, with the participation of the Czech Republic, Greece, Romania, Spain and Switzerland. Airbus is supported in the initial development of the satellite by partners including Surrey Satellite Technology Ltd, Teledyne e2v, National Physical Laboratory, Rutherford Appleton Laboratory, Deimos Space UK Ltd and AVS-UK Ltd, Thales Alenia Space Switzerland, Deimos Space SRL, Sener, and Integrated Systems Development. Further important contributions will be made by other companies and institutes from the participating nations.
The UK has embarked on a strategy to take a leadership role in this domain building on the strong climate science expertise from among others the National Physical Laboratory, the National Centre for Earth Observation and Rutherford Appleton Laboratory Space.