On GPS Velocity

Marvin May, Khien Nguyen, Bereket Tanju

Abstract:	The classic fust page of the early GPS executive briefings heralded an era of 15 meter SEP position performance, 0.l m/see (rms per axis) velocity accuracy, 100 nanosecond time transfer capability, in an all-weather, continwus environment. For the most part, the claims as to position, time transfer and environmental conditions have been or will be essentially valldatcd, whereas the conformance to the velocity performance is subject toconsiderable lnterpmtation. This paperexamines someof the fundamental aspects whichrelate the actual measurements aGPS receiver provides to the GPS equipment’s indicatedvelocity outputs. The effects of delta range avaaginginterval,samplmg.wtrapolation,geomctry, trackinglooperrors, and solution methodology are addressed. Methods of utilixing GPS velocity for applications such as INS aiding and gravimeter Etitvos compensation are discussed, as well as potential enhancements to receiver design or processing. Tradeoffs associated with using position, position and velocity and/or raw pseudorauge/deltarangarangc outputs forvelocity sensitive applications are indicated. Techniques forde-termlningdynamicvclocity field testerrorsarebrieflydiscusscdalong with actual results from a series of mobile van tests which utilized inertial sttrveying zero-velocity update techniques to construct a suitable velocity reference. DU-
Published in:	Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990) June 26 - 28, 1990 Atlantic City, NJ
Pages:	23 - 32
Cite this article:	May, Marvin, Nguyen, Khien, Tanju, Bereket, "On GPS Velocity," Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990), Atlantic City, NJ, June 1990, pp. 23-32.
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