Adaptive Tracking System Study.
Final rept. Oct 77-Oct 78 on Phase 1,
HUGHES AIRCRAFT CO FULLERTON CALIF GROUND SYSTEMS GROUP
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The application of LMS adaptive filters to bearing tracking is investigated for sum and splitbeam bearing trackers and a specific splitbeam adaptive tracker algorithm selected. The adaptive tracker does not require a prior information regarding the input statistics, and can track using breadboard and narrowband signal energy simultaneously. Time and frequency domain implementations of the tracker are presented. The performance of the tracker with a stationary broadband signal is analyzed and shown to be within .5 dB of the Cramer-Rao bound. The performance predictions are verified by computer simulations. The adaptive tracker is shown to give smaller bearing error than a conventional splitbeam tracker. In addition, the behavior of the adaptive tracker with broadband or narrowband signals that have changing bearing is analyzed, and simulations with moving targets presented. The response of the adaptive filter to a sine wave with linearly varying frequency is also analyzed. Author
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