Communication system for underwater use

Details Communication system for underwater use Communication system for underwater use

2006-02-28

2006-02-28

Pihulic, Daniel (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

Reexamination Certificate

active

07006407

ABSTRACT:
For digital underwater transmission an information sequence (17) of digital bits is partitioned into a succession of symbols each comprising n bits where n is equal to or greater than one (2npotential symbols), each symbol (19) is replaced (20) a corresponding base code sequence of length m bits and the result (21) is passed to an acoustic transducer after bi-phase modulation (22) on a carrier. The code has good correlation properties, e.g. a pseudo-random maixmal length sequence, a Gold code or a Kasami code, and the value of m
is at least (32). Preferably the base sequence is cyclically extended at one or both ends prior to modulation, and Solomon Reed redundancy coding (18) is initially applied to the information sequence. The output (23) of modulator (22) may be prefaced (26) by a pair of chirp waveforms (24). Provision is made for Doppler and multi-path correction.

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