ИСТИНА

Results of experimental research of parametric array application for marine shallow water waveguide excitation by chirp modulated signal are presented. Acoustical signal of 1-3 ms duration is generated in frequency band of 7 kHz-15 kHz by parametric array with a primary frequency 150 kHz. Sharp directivity of the parametric array transmission provides a single mode underwater waveguide excitation in the whole frequency band. It was shown a frequency modulated signal changes it form due to shallow water waveguide dispersion. Chirp modulated signal compression experimentally shown for single mode signal propagation in shallow water. This signal is transmitted in single lobe along the path up to 750 waveguide thicknesses. Wide-frequency band signal compression increases the efficiency of waveguide propagation. Discussion of the efficiency parametric array application for shallow water marine sounding is presented as well.