|Global Positioning System (GPS) surface reflected signals have previously been studied for aircraft passive bistatic altimetry and remote sensing. In this research, GPS reflected measurements from a software-defined receiver (SDR) are used for aircraft passive bistatic altimetry and coasting with a Stable Frequency Reference (SFR) to continue navigation when only two GPS satellites are available. The research in this paper focuses on flights over water, a scenario in which the water causes strong reflected signals while alternate terrestrial radio navigation signals are generally not available. Theoretical clock and position error covariances are derived as a function of measurement error, satellite geometry, SFR stability, and GPS bistatic altimetry performance. This is followed by computer simulations and evaluations using flight test data to characterize the positioning performance.
|NAVIGATION: Journal of the Institute of Navigation, Volume 63, Number 4
|413 - 426
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