Accession Number : ADD015141

Title :   Zero Cross-Correlation Complementary Radar Waveform Signal Processor for Ambiguous Range Radars.

Descriptive Note : Patent, Filed 30 Jan 91, patented 10 Sep 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gerlach, Karl R ; Kretschmer, Frank F , Jr

Report Date : 10 Sep 1991

Pagination or Media Count : 7

Abstract : A method and apparatus exploiting the discovery that the crosscorrelation of constantly spaced rows of the matrices representing certain pulse codes sum to zero. In a ranging system, such as a radar, pulses are coded according to the rows of a such a matrix, transmitted sequentially and each return processed sequentially through a filter matched to one of the coded pulses. (A different preselected filter is used for each return.) The sequence of filters is chosen so that for returns for a give range interval, each filter is matched to the representing auto-correlations of the returned pulses. These outputs are time delayed added coherently to form the compressed pulse, and annunciated as a target hit. Should the filters and returns be mismatched, as with ambiguous stationary clutter returns, the outputs of the filters are cross-correlations which, according to said discovery, sum to zero. thus the invention operates to remove ambiguous range clutter from returns in such a ranging system.

Descriptors :   CLUTTER, CODING, FILTERS, INTERVALS, OUTPUT, PULSE COMPRESSION, PULSES, RADAR, SEQUENCES, STATIONARY

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE