초록 ▼

A method for determining malfunction of a microwave intrusion detector which transmits microwave radiation into a region and receives microwave radiation to produce a receiver signal, such that a detection pattern of microwave pulses is transmitted periodically during an intrusion detection mode, in

A method for determining malfunction of a microwave intrusion detector which transmits microwave radiation into a region and receives microwave radiation to produce a receiver signal, such that a detection pattern of microwave pulses is transmitted periodically during an intrusion detection mode, including initiating a self-test mode of the detector, transmitting during the self-test mode a test pattern comprising a plurality of microwave pulses having at least two different duty cycles, different from the detection pattern, receiving microwave radiation in the self-test mode and generating a receiver signal responsive thereto and analyzing the receiver signal to derive a parameter responsive to the test pattern, so as to determine a malfunction condition.

대표청구항 ▼

[ We claim:] [1.] A method for determining malfunction of a microwave intrusion detector which transmits microwave radiation into a region and receives microwave radiation to produce a receiver signal, wherein a detection pattern of microwave pulses is transmitted periodically during an intrusion de

[ We claim:] [1.] A method for determining malfunction of a microwave intrusion detector which transmits microwave radiation into a region and receives microwave radiation to produce a receiver signal, wherein a detection pattern of microwave pulses is transmitted periodically during an intrusion detection mode, comprising:initiating a self-test mode of the detector;transmitting during the self-test mode a test pattern, different from the detection pattern;receiving microwave radiation in the self-test mode;generating a receiver signal responsive thereto; andanalyzing the receiver signal to derive a parameter responsive to the test pattern, so as to determine a malfunction condition, wherein:the detection pattern includes a combination of pulses of varying widths in a first sequential order; andtransmitting the test pattern includes transmitting a combination of pulses having substantially the same widths as the pulses of the detection pattern, in a second, different sequential order.