倾斜海底反射时声线水平偏转问题研究

三维浅海环境下,声线在倾斜海底反射时,会在水平方向上发生偏转。在远距离传播问题中,由于累积效应,接收声线的方位角与发射声线产生较大的偏差。若忽略不计,将会给声源定向等工作带来较大的误差。因此,研究声线在倾斜海底反射时的水平偏转问题,并总结其规律具有重要意义。采用射线声学的方法系统地研究了不同参数情况下倾斜海底声线水平偏转的问题,得到了在海底变化较缓时的近似公式,并进行了数值仿真分析。结果表明,声线的水平偏转的大小和方向由海底深度梯度和入射声线方位角与掠射角共同决定。

Horizontal deflection of sound ray caused by reflection from irregular sea bottom

For 3D shallow water sound propagation,horizontal deflection will be taken place when sound ray reflected from irregular sea bottom.Due to accumulative effects,the difference between the azimuth angles of received ray and launched ray can be great when the propagation range is large enough.If the deflection is not taken into account,there will be great errors in acoustic source orientation.So it is significant to study the horizontal deflection of sound ray caused by reflection from irregular sea bottom and the corresponding rule.In this paper,the horizontal deflection of sound ray based on different parameters is studied;the approximate formulae for small gradient angle of sea bottom are obtained.The results of numerical simulation and analyses indicate that the magnitude and direction of horizontal deflection are decided by the gradient of the seabed depth and the angle of azimuth and graze.