Accession Number : ADD014678

Title :   Double Phase-Lock-Loop Sonar.

Descriptive Note : Patent, Filed 28 Aug 75, patented 4 Sep 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Teel, Willis A ; Christoff, James T

Report Date : 04 Sep 1990

Pagination or Media Count : 9

Abstract : A doppler compensated sonar systems is disclosed as containing one or more data processing channels connected through a multiplexer to a like plurality of piezoelectric elements in a reversible electro-acoustical transducer. Each channel thereof includes a transmitter and a receiver, the latter of which includes signal perfecting circuitry and a pair of effectively series connected phase lock loops constituting reverberation and target doppler tracking filters, respectively. Hence, each of said channels effectively process received target signals without any adverse doppler effects being present therein which are then, in turn, read out by any suitable video display. When mounted on a fast moving vehicle, the subject doppler compensated sonar system optimizes the avoidance of hazardous or other objects that may occur in the path thereof. Keywords: Patents. (jhd)

Descriptors :   *DOPPLER SONAR, *SONAR SOUND ANALYZERS, *PHASE LOCKED SYSTEMS, *PATENTS, ADVERSE CONDITIONS, CHANNELS, DATA PROCESSING, DATA TRANSMISSION SYSTEMS, DOPPLER EFFECT, DOPPLER SYSTEMS, ACOUSTIC FILTERS, MOTION, MULTIPLEXING, PIEZOELECTRIC MATERIALS, READ OUT TECHNIQUES, REVERBERATION, ACOUSTIC SIGNALS, TELEVISION DISPLAY SYSTEMS, ACOUSTIC TRACKING

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE