CEOS EO HANDBOOK – INSTRUMENT SUMMARY
- GRAS
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Full Name
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Global Navigation Satellite Systems (GNSS) Receiver for Atmospheric Sounding
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Status
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Operational
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Instrument Agencies
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EUMETSAT , ESA
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Maturity
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Instrument Type
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Atmospheric temperature and humidity sounders  and Precision orbit
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Geometry
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Occultation
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Instrument Technology
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GNSS radio-occultation receiver
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Sampling
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Sounding
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Data Access
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Open Access
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Data Format
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Native
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Measurements and Applications
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GNSS receiver for atmospheric temperature and humidity profile sounding.
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Resolution Summary
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Vertical: 150 m (troposphere) and 1.5 km (stratosphere), Horizontal: 100 km approx (troposphere), 300 km approx (stratosphere)
[Best Resolution: 150m]
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Swath Summary
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Altitude range of 5 - 30 km
[Max Swath: 30 km]
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Accuracy Summary
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Temperature sounding to 1 K rms
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Waveband Summary
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L-Band
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Instrument Measurements
Measurements Overview
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Instrument Missions
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