Covariance Analysis of Kalman Filters Proposed for a Radiometric Area Correlator/Inertial Navigation Guidance System.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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In this report, a covariance analysis is performed on two Kalman filters proposed for use in a weapon system utilizing a strapdown inertial navigation system INS, updated by position data from a radiometric area correlator RAC, for guidance. Filter performance is analyzed when primary navigation information is provided by a Sperry INS, which uses laser gyroscopes, and when an INS employing conventional dry-tuned gyroscopes, manufactured by Hamilton-Standard, is incorporated into the weapon system. For the covariance analysis, truth models in the form of linear state equations are presented which reflect the best description of the weapon system when either the Sperry or Hamilton-Standard INS is used. The Sperry system model is composed of 46 states and the Hamilton-Standard system model 61 states. Primary emphasis in this investigation is placed on minimizing system terminal navigation error.
- Navigation and Guidance