Digital sonar system

Title: Digital sonar system

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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.

Inventors:

Young, Kenneth K. ^[1]; Wilkes, R. Jeffrey ^[1]

(Seattle, WA)

Issue Date:: 1995-01-01

OSTI Identifier:: 870174

Assignee:: Board of Regents of University of Washington (Seattle, WA) RLO

Patent Number(s):: US 5469403

Contract Number:: FG06-91ER40614

Research Org:: Univ. of Washington, Seattle, WA (United States)

Country of Publication:: United States

Language:: English

Subject:: digital; sonar; transponder; active; identifies; multifrequency; underwater; activating; signal; received; remote; transmitter; transducer; receives; acoustic; waves; including; generates; analog; electrical; receipt; converted; cross-correlated; transmission; pattern; corresponding; relative; peak; cross-correlation; value; indicative; response; identifying; transmits; responding; analog electrical; acoustic wave; acoustic waves; signal received; digital sonar; correlation value; /367/

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