Patent ID: 8456304
Filing Date: 2013-06-04
Classification: G01S,G08B

Abstract:
1. A security system providing dual sensing of an intrusion, whereby a generating signal is generated and digitized and the resulting signal strength or changes in resulting signal strength is compared to an adjustable threshold, the system comprising: a first circuit including a first signal transmitter, a first signal receiver, a signal strength measuring circuit for measuring resulting signal strength, and a second signal transmitter; a second circuit including a third signal transmitter, a second signal receiver, a second signal strength measuring circuit for determining resulting signal strength, and a fourth signal transmitter; and a base station positioned to receive signals transmitted from said second and fourth transmitters and providing a comparison thereof to an adjustable threshold to provide an indication of intrusion past a perimeter into a monitored area, and a plurality of said first and second circuits being arranged in a network to form an inner ring and an outer ring around the monitored area.