TY JOUR TI APPLICATION OF THE METHOD OF POLYSPECTRAL ESTIMATION OF INFRASONIC SIGNALS WITH HYPERBOLIC SYMMETRY FOR DETECTION OF PEOPLE IN BLOCKAGES KW acoustic energy KW hyperbolic symmetry KW infrasonic frequencies KW Fourier's spectral characteristics KW Mellin's spectral characteristics KW monospectral analysis KW polyspectral analysis JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Bogdanova, E.M. AU Ivanov, A.N. AU Rodin, V.N. PY 2014 IS 2014 PB Saint-Petersburg University of State Fire Service of Emercom of Russia