Accession Number : ADD012059

Title :   Adaptive Doppler Filter Banks.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Lewis,Bernard L

Report Date : 19 Aug 1985

Pagination or Media Count : 17

Abstract : A radar system for cancelling radar clutter with a minimum of equipment comprising an N-point Fast Fourier Transform for dividing the radar's doppler space into N contiguous frequency subbands; a delay line disposed at each frequency output port for the FFT for obtaining a set of M+1 consecutive samples from each subband, with the sampling performed at the radar's pulse repetition rate divided by N; a single M degree-of-freedom adaptive canceller moving-target indicator; and M+1 commutating switches for consecutively applying different sets of M+1 subband samples to the MTI. This operation permits clutter cancellation in each subband with N different frequency zeros placed in the radar's doppler space for each MTI degree-of-freedom.

Descriptors :   *PATENT APPLICATIONS, *RADAR CLUTTER, *MOVING TARGET INDICATORS, *CANCELLATION, DELAY LINES, RADAR, SAMPLING, FREQUENCY, OUTPUT, PORTS(OPENINGS), DEGREES OF FREEDOM, MOVING TARGET INDICATORS, PULSE RATE, REPETITION RATE

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE