Adaptive antenna arrays for frequency hopped systems

Details Adaptive antenna arrays for frequency hopped systems Adaptive antenna arrays for frequency hopped systems

1987-07-28

1989-01-24

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

375 1, G01S 316, G01S 328

Patent

active

048003905

ABSTRACT:
An adaptive antenna array arrangement for a receiver in a frequency hopped spread spectrum system. The arrangement includes an auxiliary local oscillator (lo.sub.a) which is hopped sequentially and pseudo-randomly across the spread system independently of the main frequency hopped oscillator (Lo.sub.m). The adaptive array processor (FUA, FM, PM) is digital, operates in an open loop configuration and evaluates the frequency bands during periods of time when the main oscillator is not operating in those bands. The processor derives null sterring weights for each band. The weights for each band are stored (WS) and subsequently used (W.sub.In -W.sub.Qn) when the main oscillator hops into the band and so cause the array of generate nulls directed towards sources of unwanted systems.

REFERENCES:
patent: 4217586 (1980-08-01), McGuffin
patent: 4550414 (1985-10-01), Guinon et al.
patent: 4670885 (1987-06-01), Parl et al.

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