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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. 4 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
131936
Assignee:
Univ. of Washington, Seattle, WA (United States) PTO; SCA: 440800; PA: EDB-95:157907; SN: 95001489042
Patent Number(s):
US 5,469,403/A/
Application Number:
PAN: 7-929,881
Contract Number:
FG06-91ER40614
Resource Relation:
Other Information: PBD: 21 Nov 1995
Research Org:
Univ. of Washington, Seattle, WA (United States)
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; SONAR; DESIGN; DIGITAL SYSTEMS; SOUND WAVES; ANALOG-TO-DIGITAL CONVERTERS

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