负梯度声速下特征声线与传播时间快速求解方法

求解特征声线最直接的方法是采用"扫描-插值-迭代"的声线跟踪法,过程较复杂,计算速度较慢。将负梯度声速环境下特征声线的起始掠射角表示为声速、海水深度、声源与接收点相对位置的方程,通过采用量子粒子群算法求解方程直接获得掠射角,进而确定特征声线和传播时间。与声线跟踪法相比,所提出的方法由于不存在数值累计误差和角度插值误差,因此精度更高,另外速度也更快,适合浅海负梯度环境下特征声线与传播时间的快速求解。

An approach to rapidly acquiring eigenrays and transmission times in the environment of negative gradient sound speed

The direct approach to acquiring eigenrays is the method of ray tracing by "scanning-interpolation-iteration". However, the procedure is complicated and the calculation speed is slow. When the gradient of sound speed is negative, the original grazing angle can be expressed as equations involving sound speed, seabed depth and the relative position between source and receiver. By solving the equations of the original grazing angle with QPS algorithm, the eigenrays and corresponding transmission time can be acquired conveniently. Compared with the method of ray tracing, because there are no accumulative error and angle interpolation error, the precision of the method introduced in this paper is higher. In addition, the calculated speed is so fast that the method is suitable for getting eigenrays and corresponding transmission times rapidly in the environment of negative gradient sound speed.