Intrusion detection system

Details Intrusion detection system Intrusion detection system

G - Physics

08

B

G08B 13/24 (2006.01)

Patent

CA 2144408

In an intrusion detection system comprising an open transmission line (10), for example a "leaky cable", and a receiver un- it (12S, 12T, 145, .14T, 16) for processing a radio frequency signal received by the line to detect perturbations caused by an intrud- er (28), problems of nonlinear sensitivity due to line attenuation are resolved by combining perturbation signals (R S, R T) from both ends of the open transmission line. A processor unit (18) computes logarithmic values of the perturbation signals from the opposite ends of the line and combines them to detect presence of an intruder. The sum of the logarithmic values may be used to determine presence of the intruder and the difference between them may be used to determine the location of the in- truder relative to the end of the line. The processor may also use phase information from the two perturbation signals to fa- cilitate detection in the presence of multipath effects. Reference signals (LO, IF T, RF) and power may be transmitted be- tween receiver units (12S, 145, 12T, 14T, 16) by way of the open transmission line (10) itself. The system may employ several transmissions having different frequencies, in which case the processor (18) will sum perturbation signals for all trans- mission frequencies for each end of the line, combine the two sums, and compare the result with a predetermined threshold

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