Testing a Radio Link System for Real-Time DGPS Velocity Determination

Klaus-Peter Schwarz, Ziwen Liu, and John Qiyue Zhang

Abstract:	For civilian users, effects of Selective Availability (SA) are one of the major obstacles to achieving high accuracy real-time results. In cases where highly accurate real-time velocity is required, SA effects are especially damaging. Such applications comprise real-time feedback control, such as inertial platform stabilization of airborne gravity systems or motion compensation of airborne synthetic aperture radar (SAR) mapping systems. To solve the problem, a differential correction software, designed to reduce SA effects on C/A code pseudo-range and Doppler observations, has been implemented using a radio data link. The system has been tested in an urban area and the error behavior of real-time kinematic GPS velocity has been analyzed in both the time and the frequency domain. Effects of time latency of the GPS solution have been studied for applications in real-time feedback control systems. Results indicate RMS differences of 1 cm/s with respect to a post- mission double difference solution.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1491 - 1498
Cite this article:	Schwarz, Klaus-Peter, Liu, Ziwen, Zhang, John Qiyue, "Testing a Radio Link System for Real-Time DGPS Velocity Determination," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1491-1498.
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