Accession Number : ADD003310
Title : Adaptive Clutter Cancellation for Synthetic Aperture AMTI Radar.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Personal Author(s) : Goggins,William B
Report Date : 23 Nov 1976
Pagination or Media Count : 5
Abstract : The patent relates to clutter cancellation between adjacent channels of a multichannel synthetic aperture AMTI radar accomplished by delaying signals from the forward channel to coincide with signals from the aft channel and subtracting the outputs. Adverse effects from unknown, uncalibrated and time varying parameters are compensated for by adjusting the phase and amplitude of the aft channel coherent receiver output in response to the complex multiplier signal. The synthetic aperture processing circuit outputs of each channel are averaged over many range cells and summed to determine clutter magnitude. The complex multiplier signal is made to minimize the clutter magnitude by means of a steepest descent algorithm. A mathematical expression relating the complex multiplier signal to clutter magnitude for optimum clutter cancellation is developed and a circuit is provided for mechanizing the process.
Descriptors : *Signal processing, *Synthetic aperture radar, *Patents, Radar clutter, Cancellation, Moving target indicators, Adaptive systems
Subject Categories : Active & Passive Radar Detection & Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE