Desired signal estimator for null steerer FM reception using FSK

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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H01Q 326

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active

042988713

ABSTRACT:
In a communications system including a transmitter and a receiver with a multiple antenna array having null steering apparatus attached thereto, a desired signal and an identifier signal are summed and utilized to frequency-shift key (FSK) modulate a carrier prior to transmission, the desired signal including bits of data delayed a predetermined period relative to the identifier signal and the identifier signal including the bits of data summed with a pseudo random signal and substantially reduced in amplitude relative to the desired signal, which transmitted signal is received in the null steering apparatus where the pseudo random signal is removed from the identifier signal and the data is utilized to FSK modulate a carrier to produce a reference signal, which reference signal is utilized to cause the null steering apparatus to have high response to the desired signal.

REFERENCES:
patent: 4079379 (1978-03-01), Piesinger
patent: 4079380 (1978-03-01), Esry et al.
patent: 4152702 (1979-05-01), Piesinger
patent: 4156877 (1979-05-01), Piesinger
patent: 4214244 (1980-07-01), McKay et al.

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