Research on the influence of neritic sound propagation environment to acoustics test

Sea surface and bottom constituted sound propagation environment of the neritic acoustic duct field.This thesis used the analytical calculation to resolve spherical wave into plane wave,deduced the characteristic sound field space distribution in dielectric layer,gave the calculated result of sound field change when the received point depth changes nearby a certain deepness and low frequency source settled,and analyzed elementarily the influence that the variation of received hydrophone deepness because of sea fluctuation to the sound field strength.It has stronger aim at solid boat acoustics test and practicality of engineering.