一种深海多途相干信道下的高分辨DOA估计方法  

A high-resolution DOA estimation method for deep-sea multipath coherent channels

作　　者：曹勇杰 毛卫宁[1] CAO Yongjie;MAO Weining(School of Information Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学信息科学与工程学院,江苏南京210096

出　　处：《指挥控制与仿真》2024年第4期105-112,共8页Command Control & Simulation

摘　　要：针对基于平面波声场模型的深海DOA(Direction of Arrival,DOA)估计存在误差的问题,从射线理论出发,建立了多途信道下深海DOA估计的阵列信号模型,推导出了深海多径声线传播时间和相邻阵元声线传播时延差的表征方法,运用解相干DOA估计算法,提高深海DOA估计性能,通过仿真验证了算法的有效性。研究表明,深海DOA估计问题实为多维参数优化问题;充分考虑海洋声场的声传播特性,可以从根本上解决深海DOA估计的误差问题。Aiming at the problem of error in deep-sea DOA(Direction of Arrival,DOA)estimation based on plane wave sound field model,this paper establishes the array signal model of deep-sea DOA estimation under multipath channel based on ray theory.The characterization method of deep-sea multipath ray propagation time and adjacent array element ray propagation delay difference are also derived.Compared with the propagation delay difference expression of adjacent array elements in the traditional plane wave model,the propagation delay difference expression of adjacent array elements derived in this paper is more universal.Combined with the decoherence DOA estimation algorithm,the performance of deep-sea DOA estimation is improved,and the effectiveness of the algorithm is verified by simulation.The research shows that the time delay difference between adjacent array elements is not only related to the distance between array elements and the target azimuth,but also related to the depth of the sound source and the horizontal distance from the sound source to each array element.The construction of the steering vector in DOA estimation should consider the influence of these factors.At this time,DOA estimation is a multi-dimensional parameter optimization problem.Fully considering the acoustic propagation characteristics of the ocean sound field can fundamentally solve the error problem of deep-sea DOA estimation.

关 键 词：阵列信号处理 深海多途相干信道 信号波达方向估计 高分辨方位估计 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]