Null steering apparatus for a multiple antenna array on an AM re

Details Null steering apparatus for a multiple antenna array on an AM re Null steering apparatus for a multiple antenna array on an AM re

1976-11-22

1978-03-14

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100CL, 343100LE, 343854, H01Q 326

Patent

active

040793818

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, which is a low level signal substantially in-phase quadrature with the AM signal on the carrier, to produce a reference signal which is subtracted from signals in the feedback loop of the null steering apparatus to form a lobe in the antenna pattern in the direction of the carrier modulated with the AM signal. In this circuit the identifier signal is a PN code signal and the circuitry decodes the PN code signal and shifts the phase of the remaining carrier 90.degree. so that it is a replica of the carrier signal received by the antenna.

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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