Estimation of the Zone of Detection of the Single Wire Individual Resource Protection Sensor.
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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The response of an RF intrusion detection system which makes use of a leaky coaxial cable sensor is analyzed. The system consists of a length of leaky cable encircling the protected resource, which acts as a distributed transmitting sensor. A centrally-located monopole serves as a receiving element. When an intruder approaches the leaky cable sensor, the field is disturbed, the received signal changes, and if the change is sufficiently large, a detection is declared. It is shown that for most system applications the amplitude of the signal scattered out of the leaky coaxial cable field by the intruder may be assumed to vary inversely with the distance of the intruder from the cable. The responses of the system with this field variation assumed are computed for several intrusion paths and agree well with observations. The probability of detection PD and zone of containment ZC are calculated for two receivers, one with an envelope detector and another with a quadrature detector. The uniformity of the PD and ZC along the cable are examined as a function of the cable constants. It is shown that optimal performance is obtained with a leaky cable sensor whose coupling coefficient is increased along the sensor to compensate for the loss in signal due to cable attenuation. Author
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