WIRE-WAVE DEVICE FOR DETECTION OF INTRUDERS Russian patent published in 2000 - IPC

FIELD: security alarm equipment. SUBSTANCE: device has first and second signal processing channels, which are designed as wire transmission lines, which are located in parallel to protected fence. Each channel has pulse generator, which is connected to one terminal of respective transmission line, amplitude detector, which input is connected to another terminal of transmission line, band- pass filter, which input is connected to output of amplitude detector, threshold gate and actuation device, subtraction unit, which inputs are connected to outputs of band-pass filters of channels. Threshold gates are connected to outputs of respectively first and second threshold gates. In addition, first and second AND gates are connected to outputs of respectively first and second pulse extenders. EFFECT: increased stability to noise, increased amount of output information, possibility to detect direction of movement of intruder. 3 dwg