FIELD: safety.
SUBSTANCE: invention relates to burglar alarm, in particular to seismic alarms, intended for detection of ground object penetrating through detection zone of protection line, with possibility of determining azimuth of detected object by seismic signals. Device consists of three seismic receivers, three delay lines, two groups of selectors of minimum signas difference (with total number of pit, respectively), two decisive devices, azimuth calculator and calculating unit.
EFFECT: technical result is increase in accuracy of azimuth determination of detected object.
1 cl, 4 dwg
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