Frame synchronizer

Details Frame synchronizer Frame synchronizer

1981-08-28

1984-03-06

Ng, Jin F.

Pulse or digital communications

Spread spectrum

Direct sequence

370107, H04L 708

Patent

active

044358261

ABSTRACT:
A frame synchronizer for detecting synchronizing patterns inserted at leading positions of data trains, for each data, which data trains are independent for each period, by a mechanical sensor mounted on the earth observing satellite LANDSAT is disclosed. The code synchronizer comprises a PN code generator for cyclically generating a PN code, a comparator and a counter. A receiving code train including the PN code as a synchronizing signal is applied to the PN code generator and the number of times of coincidence of the output code of the PN generator and an input code is counted. When the number of times of coincidence exceeds a preset number, it is determined that the synchronization has been obtained. A probability of wrong synchronization is minimized and the loss of image on a ground station is prevented.

REFERENCES:
patent: 3648237 (1972-03-01), Frey, Jr. et al.
patent: 4079195 (1978-03-01), Frutiger
patent: 4122393 (1978-10-01), Gordy et al.
patent: 4152651 (1979-05-01), Lampert et al.
patent: 4168529 (1979-09-01), Tomlinson
patent: 4203070 (1980-05-01), Bowles et al.

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