FIELD: rescue service, in particular, active sounding of slide rock, collapsed constructional material, snow and detecting person with signs of life. SUBSTANCE: life detector has electrically controlled switch 13, self-compensation unit 12, modulator 10, modulating generator 14, basic detector unit 17, 16 x 90 phase shifter, two synchronous detectors 18,19, two band-pass filters 21 and 20, signal squaring unit 22, integrator 23 and counter 24. Power amplifier has variable amplification coefficient. EFFECT: increased efficiency and provision for precise data. 2 cl, 4 dwg
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