Pulse or digital communications – Repeaters – Testing
Patent
1984-01-16
1985-07-02
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329107, H03K 904
Patent
active
045272760
ABSTRACT:
A digital pulse position modulation (PPM) communications system with threld extension including a radio receiver for achieving optimum coherent detection of a pulse position modulated communication signal including a coherent video detector coupled to the IF output of the radio receiver and a pulse repetition frequency loop locked to the detected video signals containing position modulation. The pulse repetition frequency loop includes a time discriminator, a filter, a voltage controlled oscillator, and a split gate generator providing a split gate no greater than the width of the applied video signal. The split gate is applied to the time discriminator resulting in the detected video signal being multiplied by itself or coherently detected. A low pass filter is connected to the output of the discriminator to provide a demodulated communications analog or quasi-analog output signal such as a voice signal, transmitted to the receiver from a digitally coded PPM communications transmitter.
REFERENCES:
patent: 3760422 (1973-09-01), Zimmer et al.
patent: 4017806 (1977-04-01), Rogers
patent: 4095211 (1978-06-01), Shaughnessy
patent: 4389616 (1983-06-01), Gockler et al.
Lane Anthony T.
Murray Jeremiah G.
Safourek Benedict V.
The United States of America as represented by the Secretary of
Zelenka Michael
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