THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - GAP -
Full Name GPS receiver-based Attitude, Position, and profiling experiment (GAP) Status Operational
Instrument Agencies CSA Maturity
Instrument Type Space environment Geometry
Instrument Technology GNSS radio-occultation receiver Sampling Other
Data Access Open Access Data Format
Measurements and Applications 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.
Resolution Summary N/A
Swath Summary N/A
Accuracy Summary
Waveband Summary 1.57542 GHz and 1.2276 GHz
 
Instrument Measurements
CategoryParameterAccuracy
Electron density profile 
Instrument Missions
ePOP on CASSIOPE - Enhanced Polar Outflow Probe on the CAScade, Smallsat and IOnospheric Polar Explorer (2013 - 2024)
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