Method of Sound Ray Refraction Correction for Underwater Target Location

A correction method for improving the positioning precision of the underwater target location –sound ray refraction modified method is studied.Firstly based on communication environment of sound ray and variation of the sound velocity,the model of spherically stratified refractive index of sea water is established.Then using Snell's law and radio-wave radial track description to get laws of the sound ray propagation path from sound source to underwater target,the practical propagation distance and angle model are obtained.By comparing to the measure parameters of underwater target tested by sonar system,the correction model of sound ray refraction for the underwater target location is established.According to the actual sound velocity profiles f seawater,underwater target location is calculated with the model of spherically stratified refractive index of sea water and sound ray refraction modified method.It is proved that the accuracy of underwater target location could be improved effectively by test.