Precise Velocity Estimation Using a Stand-Alone GPS Receiver

F. van Graas, A. Soloviev

Abstract:	Stand-alone GPS receiver velocity algorithms and flight test results are presented. A dual-frequency GPS receiver is subjected to aircraft dynamics of up to 1 g (9.8 m/s2), with aircraft bank angles of up to 45 deg. Velocity errors were determined for static and in-flight conditions. Inflight results were evaluated against a post-processed, differential kinematic GPS solution, and by an evaluation of the velocity estimation residuals. Differences between the stand-alone velocity solution and a post-processed differential velocity solution were found to be at the 2-4 mm/s-level (1-ó) for horizontal velocity components, and 9.7 mm/s (1-ó) for vertical velocity. Since these differences include noise contributions from three GPS receivers, stand-alone velocity errors are expected to be smaller than these results. This is also indicated by the stand-alone velocity residual biases, which were found to be on the order of 0.1 mm/s or less, while residual standard deviations ranged from 0.8 to 3.2 mm/s (1-ó).
Published in:	Proceedings of the 2003 National Technical Meeting of The Institute of Navigation January 22 - 24, 2003 Disneyland Paradise Pier Hotel Anaheim, CA
Pages:	262 - 271
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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