Phase coherent interference signal suppression system and method

Details Phase coherent interference signal suppression system and method Phase coherent interference signal suppression system and method

1988-12-22

1993-11-09

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Eccm

342383, 342384, 4552781, 455304, G01S 736, G01S 386, H04B 110

Patent

active

052607070

ABSTRACT:
An interference signal suppression system and method that suppresses coherent jamming signals. The system comprises first and second receiving antennas that are physically separated from each other to generate non-coherent received signals of interest. The antennas are positioned to receive communication signals that are jammed with coherent energy. The separation distance is typically 40 to 50 wavelengths of the non-coherent scattered wave radio frequency signals. Phase and amplitude adjustment circuitry is provided that alters the phase and amplitude of the received signals such that the coherent received signals are balanced and out-of-phase. These signal are then summed in a summing circuit and the output of this circuit generates signals wherein the coherent signals are nulled and the non-coherent signals are detectable. The signal suppression system and method is independent of the direction of arrival of the coherent signals, which overcomes limitations of conventional techniques.

REFERENCES:
patent: 2226836 (1940-12-01), Sinninger
patent: 3870996 (1975-03-01), Miller
patent: 3881177 (1975-04-01), Len et al.
patent: 3896442 (1975-07-01), Hemingway et al.
patent: 4628320 (1986-12-01), Downie
patent: 4851847 (1989-07-01), Clarkson

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