Synchronizer for frequency hopping receiver

Details Synchronizer for frequency hopping receiver Synchronizer for frequency hopping receiver

1976-01-26

1977-05-10

Griffin, Robert L.

Telegraphy

Systems

Printing

178 691, 325 63, 328 14, 325 65, H04B 720

Patent

active

040231038

ABSTRACT:
A receiver of a fast frequency hopping (FFH) system is synchronized with a ending transmitter in three phases from a starting condition where the frequency hopping local signal leads the received signal prior to synchronization. During the first phase, the difference frequency of a frequency hopping received signal and the frequency hopping local signal is monitored for IF during each FFH period. The FFH periods are grouped; when there is IF during all the periods of a group, the first phase terminates; however, until this condition is met, the local frequency is set back one FFH period for each group of periods. Then in the next phase, the IF in the two halves of each FFH period is compared to ascertain whether more of the leading half or more of the trailing half of each FFH period has the IF and the phase of the local signal is adjusted until the phase difference between the frequency hopping local signal and the frequency hopping received signal is less than a predetermined minor fraction of an FFH period. Then in the following phase, two additional local signals, the same as, the one local signal but phase advanced and phase retarded, respectively, by the same minor fraction of an FFH period, are separately mixed with the received signal and the differences compared; the phase of the local signal is finely adjusted to substantially equalize the IF obtained from the two signals. A fourth phase similar to the preceding phase can be added for still finer adjustment.

REFERENCES:
patent: 3409889 (1968-11-01), Graham
patent: 3713025 (1973-01-01), McNair
patent: 3766477 (1973-10-01), Cook
patent: 3851251 (1974-11-01), Wigner et al.
patent: 3962634 (1976-06-01), Russo

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