Abstract
The problem of optimum utilization of star tracker data to monitor and correct for the drift of a gyro-stabilized orientational reference platform is addressed using minimum variance estimation theory. The system configuration is arranged to make the drift compensation problem independent of base motion isolation errors or the dynamics of the platform servo drive system. A complete analytic solution to the problem is given with star tracker errors modeled as wide-band noise and gyro drift rate modeled as a random walk. The time histories of the required system gains and the error variances are calculated and plotted for the case of no prior information regarding gyro drift rate or orientational error, and for the case of no prior information on orientational error but steady-state knowledge of gyro drift rate due to previous star tracking. These results should be useful as a guide to the design of stellaraided inertial platforms and as a reference against which to compare their performance.
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