Digital sonar system

Details Digital sonar system Digital sonar system

1992-08-11

1995-11-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Transponders

With plurality of transponders

367125, 367134, H04B 159

Patent

active

054694035

ABSTRACT:
A transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that receives acoustic waves, including the activating sonar signal, and generates an analog electrical receipt signal. The analog electrical receipt signal is converted to a digital receipt signal and cross-correlated with a digital transmission signal pattern corresponding to the activating sonar signal. A relative peak in the cross-correlation value is indicative of the activating sonar signal having been received by the transponder. In response to identifying the activating sonar signal, the transponder transmits a responding multifrequency sonar signal.

REFERENCES:
patent: 3786405 (1974-01-01), Chramlec et al.
patent: 4097837 (1978-06-01), Cyr
patent: 4287578 (1981-09-01), Heyser
patent: 4442513 (1984-04-01), Mead
patent: 4472793 (1984-09-01), Benjaminson
patent: 4712201 (1987-12-01), Lagier
patent: 5025423 (1991-06-01), Earp
Schock et al., "Sediment Classification Using a Wideband, Frequency-Modulated Sonar System," Offshore Technology Conference, May 1986.
Aoki et al., "Acoustical Positioning System For Dumand-II," Proceedings of 22nd International Cosmic Ray Conference, Aug. 11-23, 1991.

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