Accession Number : ADD013261

Title :   Utilization of Entire Transmitted Bandwidth in Continuous Transmission FM Sonar.

Descriptive Note : Patent, Filed 11 Jan 82, patented 15 May 84,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Zehner, William J ; Haven, Lynn ; Skinner, David P

Report Date : 15 May 1984

Pagination or Media Count : 4

Abstract : A continuous transmission FM sonar avoids target ambiguities while utilizing the entire transmitted bandwidth for echo analysis. The sonar is characterized by digital generation of direct and quadrature versions of the transmitted frequency sweep, and balanced modulators responsive thereto to effect complex demodulation of the returned signals prior to analysis, as by a fast fourier transform frequency analyzer for target detection.

Descriptors :   *PATENTS, *SONAR EQUIPMENT, *FREQUENCY MODULATION, *CONTINUOUS WAVES, *FAST FOURIER TRANSFORMS, *SONAR SOUND ANALYZERS, *ECHO RANGING, SONAR ECHOES, SWEEP FREQUENCY TECHNIQUES, TARGET DETECTION, SONAR TARGETS, BANDWIDTH, DIFFERENCE FREQUENCY, ORTHOGONALITY, DEMODULATION

Subject Categories : Acoustic Detection and Detectors
      Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE