TERMINAL AREA NAVIGATION USING RELATIVE GPS BIAS STATES WITH A TERRAIN SCENE

Jerome J. Krempasky

Peer Reviewed

Abstract:	By using GPS target relative position bias states in the Kalman filter of a guided weapon, the effects of GPS pseudorange bias errors and absolute target location errors can be removed almost entirely if the bias states are invoked following a high-quality terrain scene position update. The performance of a guided weapon with these bias states is analyzed by means of a covariance simulation along with, for the sake of comparison, the performance of a relative GPS scheme employing a correction vector established at the terrain scene, outside of the system Kalman filter. The scenario investigated is an air-launched cruise missile flying a trajectory with a terrain scene preceding the target by 75 nmi in an environment with no GPS jammers, with three high-powered GPS jammers, and with an array of low-powered GPS jammers.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 46, Number 2
Pages:	139 - 146
Cite this article:	Export Citation https://doi.org/10.1002/j.2161-4296.1999.tb02402.x
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