Accession Number : ADD008951

Title :   Acoustic Amplitude-Threshold Target Ranging System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Owen,Thomas E

Report Date : 27 Jul 1981

Pagination or Media Count : 19

Abstract : Munition actuation signals are generated by an acoustic target ranging system that predicts the time and distance of closest approach of a moving target to a munition. The predictive capability of the system is based on the rate of change of the sound level emanating from the target compared to its absolute magnitude. The system generates munition standby, arm and fire signals by differencing the received acoustic amplitude function signal and its first derivative and subsequently comparing the difference signal with various reference level signals. The reference level signals are a function of munition effective range and target conditions. Mechanization of the system is realized by simple circuitry consisting of an acoustic signal detector and processor, a differentiating operational amplifier, a programmable gain amplifier, a reference level signal source, an adder and a comparator circuit.

Descriptors :   *Patent applications, *Acoustic detectors, *Range finding, *Proximity devices, Acoustic signals, Firing circuits, Moving targets, Target detection, Operational amplifiers, Target activated munitions, Threshold effects, Seismic detection, Amplitude, Antiaircraft weapons

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE