多途环境中的动目标距离深度联合估计

Combined Estimation of Range and Depth in Multipath Condition

水下声信道因边界反射而呈现多途特性,加之现有的各测量系统的垂直尺度的限制,致使目标深度测量发生困难.本文研究了邻近海面点声源声场和浅海水下声信道的特性,将射线声学理论引入问题的分析中,采用双水听器,利用虚源原理,提出了"双阵元多途定位(MPTDE)算法",对水下目标进行三维测量.在计算机仿真研究中构造了系统框图,对多途环境中的不同参数条件下的目标运动轨迹测量效果作了对比分析,验证了算法的目标深度测量能力.

Underwater acoustic channel presents multipath characteristics because of surface and bottom reflection, which lead to serious degradation of elevation or depth estimation. In this paper, multipath characteristic is studied with Ray Trace theory. Pseudo source theory are applied in 3-dimension passive tracking and Multipath Passive Tracking by Dual-Element (MPTDE) algorithms are presented to estimate target's 3-dimension track with dual elements. The simulate results of different multipath conditions are compared, which approves the validity of MPTDE algorithms.