非均匀矢量阵列的定向性能仿真与分析

摘要

Most traditional direction of arrival(DOA) estimate algorithms are applicable for uniform linear scalar sensor array, but they are restricted for non - uniform or anomalistic array because of asymmetry quality of space structure, so they can not meet the actual demand. To solve the DOA estimation in non -uniform vector sensor array, the time delay expression of four non -uniform vector sensor array is put forward, the array direction vector is given, the MUSIC algorithm flow chart in non - uniform vector array for DOA estimate is proposed, the better performance of each array element setting method is selected, and the probability of success and the mean square error by SNR and snapshots are calculated. The simulating experiment shows that the performance of non - uniform line array is best, and it has better performance of DOA estimation in low SNR and few snapshots.%关于探测水下声目标,针对常规波束形成空间分辨力受到限制的问题,现有波达方向(DOA)估计算法主要适用于等距均匀声压线阵,在非等距或不规则阵列中由于阵列空间结构的不均匀性而受到限制,不能满足实际需求.为解决非均匀结构矢量阵列的DOA估计,提出四种常见非均匀结构矢量传感器阵列的时延表达式,形成各阵列导向向量,通过选择各阵列中性能最优的阵元结构设置,统计了各阵列DOA估计性能随信噪比和快拍数变化的成功概率和均方误差,仿真结果表明,非均匀线阵在低信噪比和小快拍的情况下具有更高的估计性能,为波达方向定位提供了依据.