基于矢量修正的稀疏阵列测向解模糊方法

摘要

针对稀疏阵列DOA估计中存在的测向模糊问题,提出了基于矢量修正的稀疏阵列测向解模糊方法.该方法通过推导阵元相对位置与稀疏阵列角度估计之间的关系,分析了阵元相对位置的最大公约数对 MUSIC算法测向性能的影响,利用在稀疏均匀线阵特定位置添加新的阵元的方法,对原阵列的导向矢量进行修正,解决了稀疏阵列的测向模糊的问题.仿真实验结果表明,该方法不仅保留了稀疏阵大孔径的优点,提高了多信号分辨能力和测向精度,并且在低信噪比和小快拍条件下性能较好.%Aiming at the problem of direction finding ambiguity in multi-source DOA estimation of sparse array, a novel method of ambiguity resolution for sparse array based on vector correction was proposed in this paper. Firstly,the relationship between the relative position of the element and the DOA estimation of the sparse array were deduced.Secondly,the influence of the greatest common divisor of the relative position of the element on the direction finding performance of the MUSIC algorithm was analyzed.Thirdly,by adding a new element in the sparse uniform array,the steering vector of the original array was corrected.Thus,the problem of direction finding ambiguity of the sparse array was resolved.Simulation results showed that this method not only had bet-ter multi-target resolving power and estimation accuracy than classical array,but also could achieve unambigu-ous result under low SNR condition.