Accession Number : ADD009029

Title :   Site Occupancy Detector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Torok,Steve F ; Formica,Vincent A ; Lange,George P

Report Date : 04 Aug 1981

Pagination or Media Count : 7

Abstract : This invention relates to an acoustic system for covertly detecting surface to air missile (SAM) sites by monitoring for noise emitted by the electrical power generated at the sites. The output of a microphone is sharply filtered around 75 Hz and a phase lock loop locks onto the signal and tracks slight deviations. By timing logic, signals of at least 7 minutes duration with interruptions of 10 seconds or less are considered SAM targets.

Descriptors :   *Patents, *Acoustic detection, *Guided missile detection, *Surface to air missiles, *Guided missile launchers, *Electric generators, Phase locked systems, Acoustic filters, Logic circuits, Timing devices, Flip flop circuits, Circuit analysis, Noise(Sound), Low pass filters, Electric power, Guided missiles, Acoustic equipment, Logic, Superlow frequency, Sites, Targets, Detectors, Inventions, Surface to air, Monitoring, Microphones

Subject Categories : Electric Power Production and Distribution
      Guided Missile Launching and Basing Support
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE