초록 ▼

A dual-sensing intrusion detection device for detecting an intruder comprising a PIR sensor and a microwave sensor. The device comprises PIR processing means and microwave processing means, means for summing the processed PIR signal with the processed microwave signal to generate a summed signal, an

A dual-sensing intrusion detection device for detecting an intruder comprising a PIR sensor and a microwave sensor. The device comprises PIR processing means and microwave processing means, means for summing the processed PIR signal with the processed microwave signal to generate a summed signal, and means for comparing the summed signal to a sum threshold value to determine if an alarm condition exists. The sum threshold value is selected for optimal discrimination between a human intruder and an animal presence. An additional feature of the intrusion detection device is the generation of a PIR difference signal. This feature allows the device to compensate for the limited bandwidth of the PIR sensor and to be more sensitive to a human intruder. The processing of the sensor signals includes an integration technique that sums the amplitude values of the signal and causes the sum to decay at a slow rate. In addition, the slow decay rate causes the signal to be spread out in time, thereby allowing the signals from both detectors to be above the threshold at the same time.

대표청구항 ▼

[ We claim:] [1.] A dual-sensing intrusion detection device for detecting an intruder in a volume of space comprising:a) a Passive Infra Red sensing means for generating a detected PIR signal in response to sensing an intruder in the volume of space,b) PIR processing means for processing the PIR sig

[ We claim:] [1.] A dual-sensing intrusion detection device for detecting an intruder in a volume of space comprising:a) a Passive Infra Red sensing means for generating a detected PIR signal in response to sensing an intruder in the volume of space,b) PIR processing means for processing the PIR signal and for generating a processed PIR signal,c) a microwave sensing means for generating a detected microwave signal in response to sensing an intruder in the volume of space,d) microwave processing means for processing the detected microwave signal and for generating a processed microwave signal,e) means for generating a PIR difference signal as a function of the detected PIR signal,f) PIR difference signal processing means for processing the difference signal and for generating a processed PIR difference signal,g) means for summing the processed PIR signal, the processed microwave signal, and the processed PIR difference signal to generate a summed signal, andh) means for comparing the summed signal to a sum threshold value to determine if an alarm condition exists.