FIELD: guarding of perimeters of objects and approaches to objects. SUBSTANCE: seismic facility for detection of objects has seismic converter, signal processing and decision making . circuits, frequency detection channel of received seismic signal. Presence of noise-like signal across output of frequency detector suggests that object is absent. Absence of noise-like signal across output of frequency detector validates presence of object. EFFECT: increased noise immunity of seismic means of detection and reduced number of false operations. 8 dwg
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