Research/Patents/US 4975891
US 4975891

VEHICLE SENSING DEVICE AND METHOD

Assignee

Filed

Feb 13, 1970

Granted

Dec 4, 1990

Location

SILVER SPRING MD US

Abstract

A land vehicle sensing device includes a geophone for detecting vibratory gnals and a bandpass amplifier for limiting the electrical output of the geophone to those signals indicative of land vehicles. A real-time frequency analyzer provides a normalized power density spectrum signal which is threshold detected and averaged to provide an indication of land vehicle intrusion.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jul 22, 1982

Rescinded

Jun 26, 1990

Duration

7 years, 11 months

Inventor

  • 1WILLIAM C. WINELAND

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records