Patent ID: 7295111
Filing Date: 2007-11-13
Classification: B61L,G08B,G08G

Abstract:
1. A microwave detection system for automatically detecting intrusion in an off-limits zone, said system comprising: a transmitter configured to transmit a signal along a path likely to encounter an intruder to the off-limits zone; a modulating reflector configured to receive the transmitted signal to generate a modulated signal having a characteristic comprising respective amplitudes of at least two sidebands introduced by said modulating reflector, said modulating reflector configured to transmit the modulated signal; a receiver located to receive the modulated signal; a processor coupled to the transmitter and to the receiver, said processor configured to process the received modulated signal and configured to initiate an action as a function of the respective amplitudes of the at least two sidebands in the received modulated signal; and further comprising a timer, wherein the transmitter is responsive to the processor, said processor is configured to receive a gates closed signal and is further configured to initiate the transmitter to transmit the transmitted signal upon receipt of a gates closed signal, and said transmitter is configured to continue to transmit the transmitted signal, wherein the processor continues to process the received signal until said timer expires.