基于均匀圆阵的循环平稳信号的 DOA 估计

摘要

Direction of arrival(DOA) estimation of coherent sources is always a complex problem. This paper is concerned with the DOA estimation approaches of cyclostationary signals and coherent sources based on a uniform circular array. By using the method of the mode space transformation algorithm and the matrix decomposition algorithm which combines the cyclostationary signals and cyclic MUSIC algorithm, the DOA estimation of the uniform circular array and coherent sources in a Gaussian white noise environment can be realized. The simulation shows the method is efficient.%　　相干信源的 DOA 估计一直是一个十分棘手的问题，由此提出了一种基于均匀圆阵的利用信号循环平稳特性进行DOA估计的方法。利用模式空间变换算法以及矩阵分解算法的思想，结合信号的循环平稳特性和Cyclic MUSIC算法，实现在高斯白噪声背景下均匀圆阵相干信源的 DOA 估计。通过 MATLAB 仿真验证了该算法具有良好的解相干能力，在低信噪比条件下具有比常规的循环空间平滑算法更好的解相干性能。