水声定位中一种大入射角声线跟踪方法

A Large Incidence Angle Ray-Tracing Method for Underwater Acoustic Positioning

在高精度水下声学定位中,常采用分层等梯度声线跟踪的方法对水下目标进行定位。但当声线入射角度过大时,该方法入射角的迭代解算会出现发散问题。首先,针对该问题产生的原因进行了分析,并在此基础上提出了一种新的入射角迭代方法,新方法采用曲率半径R代替Snell常数p进行迭代。利用500m水深模拟数据进行了验证,结果表明:在声线入射角较小时(如不大于80°),新方法和原方法的定位精度相当;在声线入射角度进一步增大时,新方法的定位效果优于原方法。

In the field of the precise underwater acoustics,the constant gradient ray-tracing method is the normal choice for positioning.But when the incidence angle is too large,the iteration of the incidence angle will diverge.In this paper,we analyze the reason behind this problem,and present a new iteration method for cases of large incidence angles.The key element of this method is to change the iteration parameter from the Snell refraction constant pto the radius of curvature R.We use simulation data to test the effectiveness of our method.The results show that when the incidence angle is not too large（e.g.≤80°）,our new method and the original constant gradient ray-tracing method have the same accuracy,but when the incidence angle is large（e.g.80°）,the accuracy of our method is better than the original method.