Abstract
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.
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