THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - GRAS -
Full Name GNSS Receiver for Atmospheric Sounding Status Operational
Instrument Agencies EUMETSAT, ESA Maturity
Instrument Type Atmospheric temperature and humidity sounders and Precision orbit Geometry Occultation
Instrument Technology GNSS radio-occultation receiver Sampling Sounding
Data Access Open Access Data Format
Measurements and Applications GNSS receiver for atmospheric temperature and humidity profile sounding.
Resolution Summary Vertical: 150 m (troposphere) and 1.5 km (stratosphere), Horizontal: 100 km approx (troposphere), 300 km approx (stratosphere)
Swath Summary Altitude range of 5 - 30 km
Accuracy Summary Temperature sounding to 1 K rms
Waveband Summary L-Band
MW (~1.0 cm - ~100 cm)
Instrument Measurements
CategoryParameterAccuracy
Atmospheric Humidity FieldsAtmospheric specific humidity (LT, HT, LS, HS&M) 
Atmospheric Temperature FieldsAtmospheric temperature (LT, HT, LS, HS&M) 
Instrument Missions
Metop-A - Meteorological Operational Polar Satellite - A (2006 - 2019)
Metop-B - Meteorological Operational Polar Satellite - B (2012 - 2024)
Metop-C - Meteorological Operational Polar Satellite - C (2018 - 2023)
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