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Title: Digital sonar system

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:
 [1];  [1]
  1. (Seattle, WA)
Issue Date:
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/