Spatial diversity processing for underwater acoustic telemetry

Details Spatial diversity processing for underwater acoustic telemetry Spatial diversity processing for underwater acoustic telemetry

1994-02-09

1996-09-24

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

H04B 1100

Patent

active

055597572

ABSTRACT:
An underwater acoustic telemetry system uses spatially distributed receivers with aperture sizes from 0.35 to 20 m. Output from each receiver is assigned a quality measure based on the estimated error rate, and the data, weighted by the quality measure, is combined and decoded. The quality measure is derived from a Viterbi error-correction decoder operating on each receiver. The quality estimator exploits the signal and noise differential travel times to individual sensors. The spatial coherence structure of the shallow-water acoustic channel shows relatively low signal coherence at separations as short as 0.35 m. Increasing receiver spacing beyond 5 m offers additional benefits in the presence of impulsive noise and larger scale inhomogeneities in the acoustic field. Diversity combining, even with only two receivers, can lower uncoded error rates by up to several orders of magnitude while providing immunity to transducer jamming or failure.

REFERENCES:
patent: 3422397 (1969-01-01), Lagoe

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