DGPS KINEMATIC CARRIER PHASE SIGNAL SIMULATION ANALYSIS FOR PRECISE VELOCITY AND POSITION DETERMINATION

M. Elizabeth Cannon, Gerard Lachapelle, Michael C. Szarmes, Jeffrey M. Hebert, James Keith, and Scott Jokerst

Peer Reviewed

Abstract:	This paper describes the differential GPS and signal simulator equipment, procedures, and simulated aircraft trajectories used to analyze carrier phase measurements in estimating velocities and 30 positions. A differential GPS simulator system was used to generate CIA-code, P-code, and carrier phase signals from segments of the actual GPS constellation. Two pairs of dual-frequency receivers from different manufacturers were tested. These units have the capability of tracking the P-code (LlIL2 for one of the receivers and L2 for the other). An aircraft trajectory with accelerations up to 5g was simulated, and analysis is performed in terms of the resulting velocity errors and dynamics. Two methods for estimating the 30 velocities were tested, namely carrier phase with fixed-integer and real-number (float) ambiguities. Both raw Doppler measurements and a number of carrier-phase-derived Doppler measurements were tested. As a by-product, the 30 positions could also be determined using various carrier phase approaches. The estimated quantities were compared with the reference quantities known a priori to determine the performance of the receivers under the various conditions simulated.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 44, Number 2
Pages:	231 - 246
Cite this article:	Export Citation https://doi.org/10.1002/j.2161-4296.1997.tb02345.x
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