System for obscuring antenna sidelobe signals

Details System for obscuring antenna sidelobe signals System for obscuring antenna sidelobe signals

1981-03-31

1984-03-06

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 736

Patent

active

044357109

ABSTRACT:
The invention comprises a jam resistant radar system. The system comprises a primary radar transmitter which is coupled to a primary antenna having a predominant main beam and sidelobes. A second wide beam antenna is coupled to a second radar transmitter which transmits a signal having a frequency spectrum encompassing the main beam with the power density being substantially equal to the power density of the sidelobes of the primary antenna. The second transmitter is frequency modulated over a spectrum in discrete steps while the primary transmitter is pulse-to-pulse or look-to-look randomly modulated over the spectrum. This prevents a listening jammer positioned in the sidelobes from determining the pulse-to-pulse or look-to-look frequency being used by the primary radar transmitter.

REFERENCES:
patent: 4143375 (1979-03-01), Knopf

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