Accession Number:

ADD009029

Title:

Site Occupancy Detector.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1981-08-04

Pagination or Media Count:

7.0

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.

Subject Categories:

  • Electric Power Production and Distribution
  • Guided Missile Launching and Basing Support
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE