针对传统算法在强干扰及非平稳噪声复合背景下相干信源波达方向(DOA)估计精度低、鲁棒性不强等问题,文中提出了基于修正投影阻塞算法和Toeplitz矩阵重构的相干弱目标DOA估计。首先,通过接收信号的协方差矩阵进行特征值分解,构造与干扰导向矢量正交的修正投影矩阵作为干扰阻塞矩阵;然后,对接收阵列信号做预处理重新形成协方差矩阵,并对此矩阵进行Toeplitz重构解相干;最后,使用传播算子算法对重构后的协方差矩阵进行DOA估计,降低复杂度。仿真证明:该算法在复合背景下对相干信号的DOA估计比传统算法有着更高的精度和鲁棒性。

Aiming at the problems of low accuracy and weak robustness of the direction of arrival (DOA) estimation of coherent sources for traditional algorithm under the composite background of strong interference and non-stationary noise, a coherent weak target DOA estimation based on modified projection blocking algorithm and Toeplitz matrix reconstruction is proposed. Firstly, the eigenvalue decomposition is carried out through the covariance matrix of the received signal, and the modified projection matrix orthogonal to the interference guidance vector is constructed as the interference blocking matrix. Then the received array signal is preprocessed to reform the covariance matrix, and Toeplitz reconstruction is performed on this matrix for decoherence. Finally, the propagator algorithm is used to estimate the DOA of the reconstructed covariance matrix to reduce the complexity. Simulation results show that the algorithm has higher accuracy and robustness than the traditional algorithm for DOA estimation of coherent signals under the composite background.

TN957.51

国家自然科学基金资助项目