声速剖面反演对基阵倾斜失配的敏感性研究

Research about sensitivity of array inclination on sound speed profile inversion

通过推导基阵倾斜失配给声传播时间计算带来的误差,分析了这种参数失配对基于声传播时间的声速剖面反演结果的敏感性。研究结果表明,小角度倾斜时,由基阵倾斜所带来的声速剖面反演误差与倾斜俯仰角近似成正比,与声传播时间近似成反比。当基阵倾斜方位与声源一基阵连线方向一致时带来的误差最大,而垂直时误差最小。理论计算与仿真、实验结果在变化趋势和数量级上具有较好的一致性,为反演误差预报提供了参考。

From analyzing the error of sound transmission time induced by inclined array, the sensitivity about mis- match for sound speed profile （SSP） inversion based on sound transmission time is studied. It is indicated that the error of SSP inversion induced by inclined array is proportional to the pitch angle of array and inversely proportional to sound transmission time. The additional error is maximum when the azimuth angle of inclined array is accordant with the line between the source and array. However, while the azimuth angle is vertical with the line the error is minimum. The theoretical result is accordant with simulation and experiment in trends and order of magnitude. So it can provide some references for the prediction of SSP inversion error.