OHB and ESA sign Arctic Weather Satellite contract
(9 March 2021 - OHB Sweden) OHB Sweden and the European Space Agency (ESA)today signed a contract appointing OHB Sweden as the prime contractor for the development of the Arctic Weather Satellite (AWS) Programme.
Artist's impression of the Arctic Weather Satellite missio (courtesy: OHB Sweden)
The contract includes the development of the satellite (including the instrument), the development of the ground segment and also the preparation activities for the AWS constellation. The AWS is a part of the ESA’s Earth Watch programme. The AWS consists of a single satellite which is the proto-flight model of a possible future constellation of AWS satellites. The satellite is equipped with a payload specifically designed to provide global measurements of the atmosphere to enhance weather predictions (in particular over the Arctic). The mission has received funding at the ESA ministerial conference (Space19+). The signed contract has a total value of 32.5 million euros.
The overall requirements for Arctic Weather Satellite (AWS) Mission are to provide global measurements of the atmosphere to be used as part of Numerical Weather Prediction (NWP) and in Nowcasting (NWC). These measurements will also support climate research and applications. The main AWS measurements are humidity and temperature sounding of the atmosphere.
While the polar regions are well served by polar-orbiting satellites, the suitability of meteorological geostationary observations is limited by geometric constraints. In particular, atmospheric water vapour can change rapidly and would benefit greatly from more frequent observations. The revisit time requirements, identified by end-users can only be met with a constellation of satellites. Therefore, a constellation of polar-orbiting satellites providing passive microwave soundings of the atmosphere with frequent revisit times over the polar regions is proposed to address these issues.
AWS has a single Payload (cross-track scanning microwave radiometer) and the overall satellite design is significantly smaller compared to the existing polar-orbiting meteorological satellites. Streamlined Satellite and Payload design together with continuous manufacturing line production would enable affordable AWS satellite constellation.
The AWS Ground Segment includes a highly innovative Digital Beam Forming Network (DBFN) (Thales Alenia Space) in Svalbard, allowing several satellite to be tracked simultaneously from a single antenna array electronically without any moving parts. This technology is critical for the possible constellation phase of AWS to support the low latency needs of the constellation.
The AWS (Proto-Flight Model) satellite launch is planned in 2024 and the AWS constellation implementation could start immediately after.
The industrial team led by OHB Sweden consists of three core-members. OHB Sweden as mission prime, platform provider and system integrator, Omnisys instruments AB as Instrument prime and Thales Alenia Space as Ground Segment (incl. operations) prime. The entire AWS industrial team includes 31 companies (including 14 SME’s) from 12 different countries.
OHB Sweden with its extensive experience of over three decades in the design, development and testing of low-cost small satellite missions will use its successful heritage InnoSat platform, demonstrating a costeffective “new-space” approach within this program. The InnoSat platform will be slightly upgraded in such a way that it meets the possible constellation needs, serving as a versatile and flexible platform suitable for all constellation orbits.