Accession Number : ADD010639

Title :   Acoustic Amplitude-Doppler Target Ranging System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Owen,T E ; Suhler,S A ; Peters,W R

Report Date : 18 Oct 1983

Pagination or Media Count : 11

Abstract : An acoustic target sensor and ranging system automatically detects military targets and provides a munition firing signal at the appropriate target position and time. An amplitude-doppler circuit is utilized to predict the time of closest approach to a munition by a target by measuring the time interval between zero crossings of the second and third derivatives of the received acoustic wave amplitude function. The circuit produces a firing signal by logically ANDing the closest point of approach signal it develops with a signal that indicates when target range is within specified limits. The circuit is realized by means of conventional electronic zero crossing detectors, an up-down counter, dividers, sample and hold devices and voltage comparators. The acoustic target signal is obtained from an omni-directional microphone the output of which is amplified and rectified. (Author)

Descriptors :   *Patents, *Firing circuits, *Acoustic detectors, *Range finding, *Proximity fuzes, Surface targets, Aircraft detection, Seismic signatures, Acoustic signatures, Doppler effect, Amplitude, Threshold effects, Microphones, Omnidirectional, Surface targets, Aircraft signatures, Moving targets, Target signatures, Target activated munitions, Logic circuits, Comparators, Acoustic signals, Signal processing

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors
      Seismic Detection and Detectors
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE