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Physical Deterrent Barrier with Upward Looking Detection Sensor for Intruder Detection System

机译:用于入侵检测系统的具有向上看的检测传感器的物理威慑屏障

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A physical deterrent barrier is utilized as an integral part of an intruder detection sensor that provides surveillance of intrusions in the air space over the barrier. The sensor includes a corner reflecting antenna that is coextensive with and mounted on the top of the barrier. The antenna is fed from a leaky transmission line and it illuminates the air space over the barrier with r.f. energy from the intrusion detection system transmitter. Reflections caused by intrusions over the barrier are processed by detection system signal processing equipment to determine the incidence and locations of intrusion events. In a preferred embodiment the sensor is integrated into a barbed wire topped chain link fence by arranging appropriately spaced parallel strands of barbed wire into a V configuration so as to effect an electrical corner reflector at the system operating frequency. (Author)

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