Accession Number : AD0769683

Title :   Incoherent Optical Correlator for Active Sonar.

Descriptive Note : Research and development, 1 Nov 71-1 Jul 73,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Strand,T. C. ; Persons,C. E.

Report Date : JUL 1973

Pagination or Media Count : 62

Abstract : The important design parameters for an incoherent optical correlator as applied to the active sonar problem are developed and discussed. An incoherent optical correlator assembly is presented which is capable of simultaneously correlating each of six different inputs with 150 different reference functions in real time. The results of system tests using a linear frequency-modulated input signal having a time-bandwidth product of 100 are reported. (The correlator is found to have a measured processing gain of 10 dB, which is in agreement with theoretical predictions.) The performance of a liquid-crystal device used as a real-time, updatable mask is found to equal that of photographic film. (Author)

Descriptors :   (*Sonar signals, Signal processing), (*Correlators, *Optical equipment), Real time, Liquid crystals, Electrooptics, Feasibility studies, Light emitting diodes, Frequency modulation

Subject Categories : Acoustic Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE