FIELD: security. SUBSTANCE: device has wire transmission line, which is located along guarded fence, pulse generator which is connected to one terminal of wire transmission line, band-pass filter and threshold actuation circuit, which input is connected to output of band-pass filter. In addition device has peak detector, which input is connected to second terminal of wire transmission line. Output of peak detector is connected to input of band-pass filter. EFFECT: increased reliability of detection, increased field of application. 4 cl, 2 dwg
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Authors
Dates
1998-11-20—Published
1993-12-16—Filed