宽带相干信号DOA和极化参数联合估计方法

doi:10.12305/j.issn.1001-506X.2024.03.05

摘要/Abstract

摘要：

针对宽带相干信号下波达角和极化参数的联合估计问题, 提出了一种低复杂度的参数估计方法。首先, 通过轴向虚拟平移对圆阵接收信号进行平滑, 而后对平滑后的自相关矩阵进行聚焦。之后, 联合聚焦后的自协方差矩阵和平滑后的互协方差矩阵构造极化波达方向矩阵。然后, 通过该矩阵的特征值和特征向量, 经闭合式求解出入射信号的波达角和极化参数。所提算法实现了估计参数的自动配对, 无需谱峰搜索, 计算量小, 且仅需3个阵元即可实现参数估计, 能够节约硬件资源。仿真实验从复杂度、有效性和稳健性3个方面验证了所提算法的可行性。

关键词: 阵列信号处理, 宽带阵列, 相干信源, 参数估计, 极化波达方向矩阵

Abstract:

Aiming at the problem of joint estimation of direction of arrival (DOA) and polarization parameters in broadband coherent signals, a low complexity parameter estimation method is proposed. Firstly, the received signal of circular array is smoothed by axial virtual translation. Secondly, the smoothed autocorrelation matrix is focused. Then, the polarization DOA matrix is constructed by combining the focused autocorrelation matrix and the smoothed cross covariance matrix. Then, the DOA and polarization parameters of incident signals are solved by closed form through eigenvalues and eigenvectors of the matrix. The proposed algorithm realizes the automatic pairing of estimated parameters, does not need spectral peak search and has a small amount of calculation. It only needs three array elements to realize parameter estimation, which can save hardware resources. The simulation results verify the feasibility of the algorithm from three aspects: complexity, effectiveness and robustness.

Key words: array signal processing, broadband array, coherent source, parameter estimation, matrix of polarization direction of arrival (DOA)

中图分类号:

TN911.7

王栗沅, 何华锋, 韩晓斐, 何耀民, 李震. 宽带相干信号DOA和极化参数联合估计方法[J]. 系统工程与电子技术, 2024, 46(3): 805-813.

Liyuan WANG, Huafeng HE, Xiaofei HAN, Yaomin HE, Zhen LI. Joint estimation method of DOA and polarization parameters based on broadband coherent signals[J]. Systems Engineering and Electronics, 2024, 46(3): 805-813.

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