水平变化浅海声波导中模态特征频率与声源距离被动估计

针对水平变化浅海声波导中声源宽容性被动测距问题,理论分析了海底地形水平缓变浅海波导中卷绕变换基础上的低频声场特征频率.推导了绝对硬海底时水平变化波导中声场模态时频到达结构以及模态瞬时相位的表达式,由该表达式给出了特征频率与收发距离的变化关系,进而提出了水平变化浅海波导中声源距离被动估计的修正方法,通过仿真和实验对理论与方法进行了验证.

Modal characteristic frequency in a range-dependent shallow-water waveguide and its application to passive source range estimation

In order to implement robust passive source ranging in a range-dependent shallow-water waveguide, the modal characteristic frequencies are theoretically analyzed based on warping transform. Formulae of the modal spatiotemporal arrival structure and instantaneous phase are derived in the waveguide with an absolute hard bottom. The relationship between the characteristic frequency and the source-receiver range is developed. With the relationship, a modified passive source-range estimation approach is presented in a range-dependent shallow-water waveguide. Simulation and experiment verify the theory and the approach.