Adaptive Array Control.
Final rept. 1 Nov 73-1 Feb 75,
GENERAL ATRONICS CORP PHILADELPHIA PA
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Radar targets such as slow, low flying aircraft and moving ground vehicles may be detected by employing an adaptively controlled antenna array with an AMTI radar set, conformally mounted in a high performance jet aircraft. Clutter cancellation is achieved through moving the active subaperture of the phased array to the rear of the aircraft with the transmission and reception of each pulse. The adaptive control unit which forms these subapertures employs a Guided Accelerated Random Search algorithm to maximize the clutter cancellation ratio of a coherent two-pulse canceller. The test results demonstrated that the adaptive array control circuitry can achieve a 8.5 dB output target-to-clutter power ratio for moving targets as much as 34 dB below the input clutter power. It took approximately one hundred iterations of the control algorithm to reach the minimum normalized cancelled clutter power level, and less than fifty iterations to achieve 30 dB of clutter cancellations.
- Active and Passive Radar Detection and Equipment