这种以传播为基础的被动测距方法利用的是水平(拖曳)阵而不是常规的垂直阵,并且不需要传播模的先验知识。虽然基于模的计算仍然需要,但出人意外的是不需要明显地知道声速剖面、海洋深度和海底参数,因为足够求解声源距离的信息可从测量数据本身导出。 This propagation-based passive ranging approach utilizes a horizontal (drag) array instead of a conventional vertical array and does not require prior knowledge of the propagation modes. Although model-based calculations are still needed, it is surprising that the sound velocity profile, ocean depth and seafloor parameters do not need to be clearly known, since enough information to solve for the source distance can be derived from the measured data itself.