Microwave detection system and method for detecting intrusion to an off-limits zone
First Claim
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.
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Accused Products
Abstract
A system and method are provided for automatically detecting intrusion in an off-limits zone. The system includes a transmitter transmitting a signal along a path likely to encounter an intruder to the off-limits zone and a modulating reflector for receiving the transmitted signal. The modulating reflector includes a modulator receiving the received signal and generating a modulated signal having a characteristic. The modulating reflector transmits the modulated signal to be received by a receiver located to receive the modulated signal. The system further includes a processor coupled to the transmitter and to the receiver, the processor being configured to process the received modulated signal and to initiate an action as a function of the characteristic in the received modulated signal.
30 Citations
29 Claims
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1. A microwave detection system for automatically detecting intrusion in an off-limits zone, said system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for automatically detecting intrusion in an off-limits zone, said method comprising:
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transmitting a microwave signal along a path likely to encounter an intruder to the off-limits zone; receiving the microwave signal at a modulating reflector; modulating the signal received by the modulating reflector to generate a modulating signal having a characteristic comprising respective amplitudes of at least two sidebands; transmitting the modulated signal to be received by a receiver; processing the modulated signal to measure the respective amplitudes of the at least two sidebands in the received modulated signal; initiating an action as a function of the measured characteristic in the received modulated signal; and further comprising; receiving a gates closed signal; initiating the transmitter to transmit the transmitted signal upon receipt of a gates closed signal; and terminating the transmitter to transmit the transmitted signal upon the expiration of a timer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification