Sidelobe discriminator

Details Sidelobe discriminator Sidelobe discriminator

1979-09-12

1981-05-05

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

H04B 700

Patent

active

042662265

ABSTRACT:
Systems for discriminating between signals on the mainbeam of an antenna and signals on the sidelobes of the antenna are disclosed. In one system, sidelobe discrimination is accomplished by positioning an auxiliary antenna relative to a collecting antenna for receiving signals arriving on the radiation pattern of the auxiliary antenna substantially coincident with the receipt of signals by the collecting antenna on the sidelobes of the collecting antenna; modulating the signals received by the auxiliary antenna to have a predetermined modulation pattern; providing received signals in response to both the signals collected by the collecting antenna and the modulated signals; and detecting the received signals having the predetermined modulation pattern, to thereby discriminate the detected signals as being coincident with the signals arriving on the sidelobes of the collecting antenna, and for providing an identification signal to indicate whether the received signal is coincident with signals arriving on the sidelobes of the collecting antenna. In another system, signals arriving on the sidelobes of a collecting antenna array are modulated in response to modulation signals provided to the feed network of the antenna array. Corresponding systems for discriminating between signals transmitted on the mainbeam and sidelobes of a transmitting antenna and between signals transmitted on the mainbeam and sidelobes of a transmitting antenna array also are disclosed.

REFERENCES:
patent: 3248731 (1966-04-01), Bickmore et al.
patent: 3427621 (1969-02-01), Brunner
patent: 3735266 (1973-05-01), Amitay
patent: 4129873 (1978-12-01), Kennedy

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