Null steering apparatus for a multiple antenna array

Details Null steering apparatus for a multiple antenna array Null steering apparatus for a multiple antenna array

1976-11-22

1978-03-14

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100CL, 343100LE, 343854, H01Q 326

Patent

active

040793796

ABSTRACT:
Null steering apparatus in a multiple antenna array including means associated with each antenna for separating signals therefrom into in-phase and quadrature components which can be adjusted so that unwanted signals from the array are cancelled and further including circuitry for separating an identifier signal from the desired signal and utilizing the identifier signal to produce a replica of the desired signal which is subtracted from the feedback loop of the null steering apparatus to form a lobe in the antenna pattern in the direction of the desired signal. In this circuit the desired signal is a PSK digital data signal and the identifier is a similar signal transmitted at a lower level and leading by one bit. The circuitry in the null steering apparatus delays the identifier by one bit so that it is a replica signal of the desired signal.

REFERENCES:
patent: 3670335 (1972-06-01), Hirsch
patent: 3763490 (1973-10-01), Hadley et al.
patent: 4032922 (1977-06-01), Provencher

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