CEOS EO HANDBOOK – INSTRUMENT SUMMARY
- GAP
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Full Name
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GPS receiver-based Attitude, Position, and profiling experiment (GAP)
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Status
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Operational
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Instrument Agencies
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ESA
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Maturity
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Instrument Type
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Space environment
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Geometry
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Instrument Technology
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GNSS radio-occultation receiver
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Sampling
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Other
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Data Access
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Open Access
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Data Format
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Measurements and Applications
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Used for spacecraft position and attitude determination and for ionospheric radio occultation profiling measurements in which the relative phase delay of the measured L1 and L2 signals (at frequencies of 1.57542 GHz and 1.2276 GHz, respectively) from different satellites of the GPS constellation will be used to determine the electron density profile of the ionosphere using tomographic techniques. The GAP is turned on an average of 10% of the time, following a schedule devised by the science team.
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Resolution Summary
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N/A
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Swath Summary
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N/A
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Accuracy Summary
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Waveband Summary
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1.57542 GHz and 1.2276 GHz
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Instrument Measurements
Measurements Overview
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Instrument Missions
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