Pulse or digital communications – Repeaters – Testing
Patent
1989-04-17
1991-05-14
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 83, 375 96, 375103, H04B 110
Patent
active
050162616
ABSTRACT:
Method and apparatus are disclosed for improving the anti-jam performance of a processing circuit to increase conversion gain and reduce small signal suppression resulting from processing a phase modulated input signal accompanied by jamming interference. Input signals are each segregated into signal chips by a matched filter 23, and by an adaptive threshold circuit 13 in accordance with a predetermined relative threshold. The threshold is set to repeatedly distinguish a predetermined number of signal chips having greater signal amplitude. The absolute amplitude threshold level may, therefore, vary in accordance with the particular signal chips forming each input signal segment. A phase quantizer 29 operates to extract phase information from the signal chips. A phase correlator 15 operates to apply a first weighting gain factor to signal chips equal to or exceeding the threshold, and a second weighting gain factor to the remaining chips, the first weighting gain factor being greater than the second weighting gain factor.
REFERENCES:
patent: 3432619 (1969-03-01), Blasbalg
patent: 4587662 (1986-05-01), Langewellpott
patent: 4833694 (1989-05-01), Young et al.
Amoroso Frank
Bricker Jacob L.
Denson-Low Wanda K.
Hughes Aircraft Company
Safourek Benedict V.
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