EO·Atlas
Metop-SG Radio Occultation sounder
Compiled from public sources on 2026-06-16. Not independently verified by RUAG Space Sweden (Beyond Gravity).
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GNSS radio occultation receiver mission on Metop-SG A satellites for atmospheric temperature and humidity profiles, planetary-boundary-layer and tropopause monitoring, surface pressure, and ionospheric electron-density profiles.
The Metop-SG Radio Occultation sounder is the EPS Second Generation radio-occultation payload for atmospheric sounding from refracted GNSS signals.[1] It supports retrievals for temperature, water vapour, planetary-boundary-layer height, tropopause structure, surface pressure, and space-weather electron-density information.[1] The instrument is also known as GRAS-2 and tracks GPS, Galileo, and BeiDou signals.[2] It uses L-band frequencies at 1.17645, 1.2276, and 1.57542 GHz with RHCP polarisation.[3] Daily performance figures include about 1500 soundings per day, 1900-2100 occultation measurements per day, and 2100 per day per instrument.[3][2][4] The instrument performs GNSS radio occultation, demonstrated on Metop-SG A1.[1]
Compositional position
- GNSS radio occultationvia Metop-SG-A1
RO sounder retrieves atmospheric profiles from refracted GNSS signals.
None on record.
- [1]EUMETSAT Metop-SG instruments overviewagency doc2026-06-16
- [2]WMO OSCAR instrument record: ROagency doc2026-06-16
- [3]The GRAS-2 radio occultation missionpeer reviewed2026-06-16
- [4]Beyond Gravity radio occultation instrumentsoperator engineering2026-06-16