Radio coupled device for detecting and analyzing weak transmissi

Details Radio coupled device for detecting and analyzing weak transmissi Radio coupled device for detecting and analyzing weak transmissi

1977-12-23

1980-06-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

340167A, 375 34, 375 96, H04B 112

Patent

active

042075246

ABSTRACT:
A signalling device employing radio frequencies in which the transmitter produces a weak, or relatively weak, encoded transmission within a crowded frequency band and an associated receiver which includes a processor capable of detecting and analyzing the weak signal by applying significance to each signal parameter including pulse width, word length, pulse characteristic, number of bits; and, imposing the further requirement that the same parameters must be perceived a second time within a prescribed 0.2-0.8 sec. interval to insure that the signal has been produced by a correctly encoded transmitter and not by a mere random reception. It is a characteristic of the signal processor that it search the received transmission, digitally analyze the encoded signal notwithstanding high noise/signal ratio, and detect the presence of the encoded signal, and then operate a system after having authenticated a transmission and reception of the encoded signal by requiring a second detection of the encoded signal within a prescribed time. In this way, the system is free of spurious actuations arising from mere random duplication of the encoded signal.

REFERENCES:
patent: 3510777 (1970-05-01), Gordon
patent: 3852713 (1974-12-01), Roberts
patent: 3906348 (1975-09-01), Willmott
patent: 4006462 (1977-02-01), Podowski
patent: 4020477 (1977-04-01), Holland
patent: 4095211 (1978-06-01), Shaughnessy

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