Surveillance systems

Details Surveillance systems Surveillance systems

G - Physics

01

S

343/17

G01S 17/06 (2006.01) G08B 13/24 (2006.01)

Patent

CA 1145015

Improvements in or relating to surveillance systems ABSTRACT A surveillance system transmits a microwave carrier signal through a surveillance zone (14). Two low frequency enemy fields are also established in the zone being produced by respective pairs of closely spaced apart low frequency signals radiated from opposite sides of the zone. A receptor reradiator in the zones receives these signals and reradiates a reply signal to a receiver the reply signal consisting of the microwave carrier signal amplitude modulated in accor- dance with the instantaneous value of the low frequency fields at the location of the receptor reradiator. The receiver separates out preselected intermodulation products and activates an alarm only when the preselected intermodu- lation products are present.

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