基于Toeplitz矩阵的互耦误差下相干信号源DOA估计

DOA Estimation of Coherent Signals Under Mutual Couple Based on Toeplitz Matrix

在阵列互耦误差存在的前提下,针对多组相干信号源和若干非相干信号源并存的情况,提出了一种对信号源进行准确估计的算法.算法首先估计阵列的互耦参数,并利用此互耦参数对阵列接收数据进行补偿;然后利用Toeplitz矩阵重构法对相干信号进行解相干;最后利用MUSIC算法估计各个信号源的来波方向(direction of arrival,DOA).实验结果表明,算法有效解决了互耦的影响,避免了阵列损失,实现了间距很小信源的准确估计.

This paper describes the method of direction of arrival （DOA） estimation for many groups of coherent and uncorrelated sources under mutual couple based on Toeplitz matrix. The method first estimates the mutual couple parameter of the linear array, and compensates the array date using the mutual couple parameter. Then, the method deeoherences the coherent sources by using Toeplitz matrix. Finally, the DOA of each source is estimated by using the MUSIC method. Experimental results show that the algorithm is effective in solving the influence of mutual coupling, avoiding the loss of array, and realizing the accurate estimation of small sources.