基于垂直线列阵数据提取浅海波导声传播参数的模值追踪法

垂直水听器线列阵接收的声数据或其互谱密度矩阵可以用来提取浅海波导声传播的简正波模深度函数、水平波数和海底参数。在实际应用中,布放在海洋中的垂直水听器线列阵不可避免地产生倾斜。计算机仿真结果表明,垂直阵的倾斜使提取参数误差大幅增大。针对此问题,提出模值追踪法,构建模值追踪代价函数,对垂直水听器线列阵声数据互谱密度矩阵的本征矢量的模值进行逼近。仿真结果表明,模值追踪法可以有效消除基阵倾斜的影响。在仿真条件下,水平波数估计误差小于0.1%,海底相移估计误差在±1.1范围内。

Absolute value shooting method for sound propagation parameter extraction of shallow water waveguide with the received acoustic data from a vertical line array

The received acoustic data and the CSDM (cross spectrum density matrix) collected by a vertical line array can be used to estimate modal depth function, horizontal wave-number and bottom reflection phase shift of shallow water waveguide. In fact, the vertical line array deployed in sea is tilted. It is shown from simulation that the errors of estimated parameters are enlarged seriously by the tilt of the line array. In this paper, an absolute value shooting method is used to solve this problem. In this method, the cost function for shooting is replaced by an absolute value shooting cost function. Simulation shows that the influence of the tilt of the vertical line array can be eliminated. In the simulation, the errors of estimated horizontal wave-number and the estimated bottom reflection phase shift are less than 0.1% and ±1.1, respectively, when the vertical line array is tilted with a gradient of 0.1.