Accession Number : ADD017303

Title :   Determination of Jammer Range and Azimuth by Use of a Coherent Side Lobe Canceller System.

Descriptive Note : Patent, Filed 26 Jun 75, patented 1 Nov 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hansen, James P

Report Date : 01 Nov 1994

Pagination or Media Count : 7

Abstract : An improved countermeasure detection system and technique for determining the range and azimuth of a noisejammer in a radar environment. A signal limiter is inserted into the output loops of a conventional multi loop side-lobe canceller system such that the loops only respond to interference signals in the main lobe of a radar antenna as it sweeps through the jamming source. Each of the loops develops a weighting signal that is a measure of the absolute phase of the interference signal at an auxiliary antenna with respect to the phase center of the main radar antenna. By using two or more weighting signals and the known placement of each auxiliary antenna relative to the main radar antenna, the range and azimuth of a jammer can be calculated using available processing equipment to solve simultaneous equations.

Descriptors :   *RADAR COUNTERMEASURES, *CANCELLATION, *SIDELOBES, *NOISE JAMMING, OUTPUT, SOURCES, AUXILIARY, ENVIRONMENTS, DETECTORS, RADAR TRACKING, PROCESSING EQUIPMENT, RADAR, WEIGHTING FUNCTIONS, INTERFERENCE, RADAR SIGNALS, RADAR ANTENNAS, AZIMUTH, LOOPS, DETERMINATION, LIMITERS, SCHEMATIC DIAGRAMS, SIMULTANEOUS EQUATIONS, DIRECTIONAL ANTENNAS, TRIANGULATION

Subject Categories : Radar Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE