浅海角度-时间灵敏度核特性研究

The Characteristics of Time-angle Sensitivity Kernels in Shallow Water

灵敏度核是声学观测量扰动与声速扰动之间的关系量,为探究浅海声波导中声场的扰动位置对声波到达时间、到达角度等声学观测量的影响程度,用格林函数一阶玻恩近似结合双波束形成的阵处理方法,推导得到角度-时间灵敏度核。对选取的本征声线进行研究,相关结果表明角度-时间灵敏度核包含了更多的空间属性,弥补了传统灵敏度核在声场扰动位置判断上的不足,为灵敏度核在海洋观测中实验站点布设优化及海洋环境参数反演等方面的应用提供了有力支撑。

The sensitivity kernels build a linear relationship between the sound-speed perturbations and the observable variations received.In order to explore the influence of the sound-speed perturbations’position on acoustic observation in shallow water,such as arrival time and arrival angle,the first-order Born approximation of green’s function combining with the double-beamforming algorithm is used to derive the angle-time sensitivity kernels.Researching on the selected eigen rays,relevant results show that the angle-time sensitivity kernels contains some additional properties,which make up for the shortage in judgment of perturbations position.These results will be useful for stations arranging in experiments,they may be promising for ocean parameters inversion in the future.