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Rescinded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
Record Details
- Patent number
- US 4975891
- Application
- 00501483
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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