Surveillance method and system with electromagnetic carrier...

Details Surveillance method and system with electromagnetic carrier... Surveillance method and system with electromagnetic carrier...

G - Physics

08

B

340/125, 340/124

G08B 13/24 (2006.01)

Patent

CA 1107835

Abstract of the Disclosure A microwave carrier signal is transmitted throughout a surveillance field. Two low frequency signals are also radiated into the field from opposite sides to limit the field size. A miniature receptor-reradiator containing a non-linear signal mixing device responds to the signals when in the field to return a modulated carrier signal to a receiver device for actuating an alarm. The alarm is actuated only when the receiver detects a signal having a carrier component corresponding to the microwave signal with sideband components corresponding to the sum of the frequencies of the two low frequency signals.

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