Abstract
Models of GPS carrier phase measurements have been derived, analyzed, and used to develop an off-line simulator. This work is being carried out to support the development of Carrier phase Differential GPS (CDGPS) systems for relative navigation of formations of spacecraft that orbit in GEO and HEO. Carrier phase models are built up by considering signal generation on the GPS satellite and signal processing in the user receiver. An analysis of measured carrier phase has been used to develop receiver design guidelines which guarantee that a receiver's outputs can be used by CDGPS algorithms that resolve carrier phase ambiguities as exact integers. The carrier phase simulation includes errors such as incorrect GPS ephemerides, thermal noise, multi-path, circular-polarization-induced phase wind-up, and altitude-dependent ionospheric delay. Simulation results demonstrate the efficacy and limitations of CDGPS for use in relative navigation of spacecraft formations.
Published Version
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