Tracking and telemetry system for severe multipath acoustic chan

Details Tracking and telemetry system for severe multipath acoustic chan Tracking and telemetry system for severe multipath acoustic chan

1982-09-13

1984-07-31

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

367901, H04B 1100

Patent

active

044634528

ABSTRACT:
A modulation/signal processing technique for acoustic communication in show water. Digital information is transmitted in a time expended version of frequency shift keying where a tone burst at a first frequency represents a logical zero and a tone burst at a second frequency represents a logical one. There is a long quiet time between bits to allow multipath interference to decay. A relative energy detector with a fast attack/slow decay circuit for Doppler compensation is used to receive the transmitted tone bursts and reproduce a digital data train equivalent to the transmitted pulse train. A single communication channel employs two frequencies to transmit an identity code as a signal validating and identification method and two frequencies to simultaneously transmit telemetry data.

REFERENCES:
patent: 3289152 (1966-11-01), McIlwraith et al.
patent: 3742440 (1973-06-01), Ehrlich et al.

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