Pulse or digital communications – Repeaters – Testing
Patent
1983-12-22
1985-12-10
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
455 63, 455 86, H04B 1500
Patent
active
045584532
ABSTRACT:
A frequency hopping radio frequency communication system and method in which keying (at Time T.sub.1) of a transmitter (Tx) automatically initiates the transmission of a predetermined number of cycles (C.sub.1 -C.sub.8) of a sync acquisition signal (W, X, Y and Z) at each of a number of different frequencies (A-G). The receiver (Rx) is being tuned through the same frequencies (A-G) at a relatively slower rate so that the sync acquisition signal is received at each of the receiver frequencies. Upon recognition of the sync acquisition signal and the cycle in which it is received, the receiver anticipates the end of the last cycle of the sync acquisition signal in synchronism with the transmitter and initiates tuning of the transmitter and receiver in accordance with a predetermined pseudorandom code. Additionally, a synchronization maintenance signal is sent approximately every ten seconds to insure that the synchronization between both radios is precisely maintained. Upon termination of a transmission, an "end of message" signal is sent. Depending upon the radio mode selected, both radios will either simultaneously return to the "search" or acquisition mode, in which case resynchronization is required each time the transmitter is keyed, or in which synchronism is retained for a predetermined time (T.sub.3 -T.sub.5 and T.sub.6 -T.sub.7) following transmission to permit receipt of an answer without the necessity of re-establishing synchronism.
REFERENCES:
patent: 4023103 (1977-05-01), Malm
patent: 4030033 (1977-06-01), Bibl et al.
patent: 4320514 (1982-03-01), Haskell
patent: 4328581 (1982-05-01), Harmon et al.
Harris Corporation
Rogers, III L. Lawton
Safourek Benedict V.
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