Method and apparatus for sidelobe reduction in radar

Details Method and apparatus for sidelobe reduction in radar Method and apparatus for sidelobe reduction in radar

1972-01-20

1979-03-27

Birmiel, Howard A.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100LE, 343100TD, G01S 338, G01S 102

Patent

active

041468899

ABSTRACT:
In a system for reducing sidelobes in adaptive receiving array antennas, an auxiliary signal is radiated through an omnidirectional antenna collocated with the phase center of an adaptive array antenna. The auxiliary signal is so transmited as to form a probe or pilot beam with a notch in the main-beam direction by transmitting through both the omnidirectional and the array antenna simultaneously. The relative phases of both antennas are controlled to obtain near-zero radiation in the main-beam direction. Adaptive control loops receive returns from the probe beam and adjust the weights of the receiving array antenna. The receiving array weights are used to form a low sidelobe antenna pattern for reception of the main radar signal, which is transmitted with a directional pattern. Either time or frequency separation may be used to distinguish the probe beam from the main beam.

REFERENCES:
patent: 3167761 (1965-01-01), Le Parquier
patent: 3435453 (1969-03-01), Howard

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