USA As Represented by Secretary of the Navy

Edward H Hug

Cabell N Pryor, Jr

William C Wineland

Ralph S Hebbert

Michael H Stripling

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.

Vehicle sensing device and method

A line spectrum detector to distinguish motor vehicles acoustically in the resence 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.

Growing community of inventors

McLean, VA, United States of America

Edward H Hug