Spread Spectrum telemetry

Details Spread Spectrum telemetry Spread Spectrum telemetry

1990-09-28

1992-08-04

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

367 76, H01K 100

Patent

active

051366134

ABSTRACT:
Transponders in or with a shallow water seismic cable emit acoustic signals for acoustic ranging on command from a transceiver aboard a seismic exploration vessel. The acoustic ranging data together with navigational data cna be used to identify cable location. The transponders are activated by individual identifying digital codes. Each such digital code is a data word of suitable length composed of a distinctive frequency sent in bursts for a specific time for successive pairs of bits, or di-bits, in the data word. The time spacing between sending the frequency bursts is also used to carry other di-bits of the data word.

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patent: 4809299 (1989-02-01), Ho
patent: 4860307 (1989-08-01), Nakayama

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