Accession Number : ADD017301

Title :   Mainlobe Canceller System.

Descriptive Note : Patent, Filed 5 May 80, 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 : 8

Abstract : An interference suppression system for cancelling undesired signals received through the mainlobe of an antenna as well as its sidelobes. The interference suppression system has a main channel input having high gain for receiving desired signals and undesired signals and forming a main channel waveform, and an auxiliary channel input having low gain for receiving desired signals and undesired signals and forming an auxiliary channel waveform. A control circuit senses the relative undesired signal power in the two channels and responds by switching the waveforms in the two channels between two inputs of an interference-reducing circuit according to whether sidelobe or mainlobe interference is present in the main channel. The interference-reducing circuit corrects whichever waveform is fed to its first input in amplitude and phase and combines the corrected waveform with the other waveform at its second input to form an output waveform such that undesired signals in the two input waveforms substantially cancel one another while the desired signal is not cancelled.

Descriptors :   *RADAR SIGNALS, *CANCELLATION, *SUPPRESSION, *RADAR INTERFERENCE, SIGNAL PROCESSING, INPUT, OUTPUT, CONTROL, AUXILIARY, WAVEFORMS, GAIN, INTERFERENCE, LOW LEVEL, POWER, CIRCUITS, CHANNELS, DUAL CHANNEL, SIDELOBES, CORRECTIONS, PATENTS, ANTENNA LOBES, HIGH GAIN

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE