水下目标定位中的声线折射修正方法

Method of Sound Ray Refraction Correction for Underwater Target Location

研究了提高水下目标定位精度的一种误差修正方法-声线折射修正方法.首先根据水下声线传播环境和声速变化规律建立了海水的折射率球面分层模型.然后基于Snell定理,利用射线描迹方法得到从声源到水下目标的声线传播轨迹,从而建立声线的真实传播距离和角度模型.经与声纳测量系统的测量参数比对,建立了水下目标定位中的声线折射误差修正模型.根据实测的海水声速剖面,利用折射率球面分层模型和声线折射修正模型进行了水下目标定位的数值计算.实验证实,采用声线折射修正方法可以有效地提高水下目标的定位精度.

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.