Accession Number : ADD004020

Title :   Vehicle Detector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Pryor,Cabell N , Jr ; Hug,Edward ; Stripling,Michael H

Report Date : 25 Jan 1977

Pagination or Media Count : 7

Abstract : A line spectrum detector to distinguish motor vehicles acoustically in the presence of background noise. The detector senses periodic signals, such as the firing rates of internal combustion engines, by using a swept phase-lock loop spectrum analyzer and passes the sensed signals to a logic network which measures the frequency stability of the sensed signal to distinguish motor vehicles from aircraft vehicles and the like. (Author)

Descriptors :   *Patents, *Acoustic detectors, *Spectrum analyzers, Aircraft detection, Ground vehicles, Internal combustion engines, Background noise, Target classification, Line spectra

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE