Accession Number : ADD017997

Title :   Method and Means for Short Pulse Interference Rejection.

Descriptive Note : Patent, Filed 30 Aug 77, patented 26 Mar 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cantrell, Ben H ; Lewis, Bernard L

Report Date : 26 Mar 1996

Pagination or Media Count : 7

Abstract : A radar interference circuit which rejects both continuous noise and short pulse interference signals. A plurality of omnidirectional antennas are placed around the main directional radar antenna and connected in differing sets to a plurality of canceller means to each of which the main antenna signal is also connected. The canceller means for each set of three Omnis and the main antenna cancels out the white-noise interference received by that group of antennas. The outputs of the plurality of canceller means are then taken in different sets of two each, subtracted and compared to a threshold signal. If one or more comparator outputs are above the threshold, signifying that the antenna pulse signal is being received through the sidelobes of the antenna patterns, the outputs of these comparators will he a one signal and the OR gate, to which the comparator outputs are fed, will provide an output to blank the radar. Thus short pulse signals arriving through the sidelobes of the antenna patterns are rejected as interference signals.

Descriptors :   *SUPPRESSION, *PATENTS, *RADAR INTERFERENCE, OUTPUT, THRESHOLD EFFECTS, GATES(CIRCUITS), NOISE REDUCTION, RADAR ANTENNAS, ANTENNA RADIATION PATTERNS, SIDELOBES, SHORT PULSES, REJECTION, NOISE(RADAR), OMNIDIRECTIONAL ANTENNAS, COMPARATORS, DIRECTIONAL ANTENNAS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE