多径环境下阵列波达方向估计及互耦校正

Array DOA Estimation and Mutual Coupling Calibration Algorithm for Multipath Condition

在阵列信号处理的研究中,多径环境会降低接收机的定位精度,传统的多重信号分类算法的性能会大大降低,空间平滑算法能有效地进行解相干。当阵列天线存在互耦效应时,传统的空间平滑算法的测向性能会大大下降。针对多径环境下的均匀线阵,利用互耦矩阵的复对称带状的结构特点,结合空间平滑算法,提出了一种可以进行互耦校正的波达方向估计算法。该算法通过求解线性约束下的二次规划问题,利用谱峰搜索得到入射信号的DOA。数值仿真结果验证了该算法的有效性。

In array signal processing, multi-path environment will reduce the positioning accuracy of the receiver, the performance of traditional MUSIC algorithm will be greatly reduced, and spatial smoothing algorithm can effectively perform decoherence. In multipath condition, the performance of direction finding of traditional spatial smoothing algorithm decreases sharply in the presence of sensor mutual coupling. To solve mutual coupling of uniform linear array(ULA)in the presence of multipath condition, a direction of arrival(DOA) estimation algorithm based on mutual coupling correction is proposed. The algorithm is based on the special structure of mutual coupling matrix(MCM) of ULA and combines spatial smoothing algorithm. By solving a quadratic optimization problem under the linear constraint and utilizing peak search technology it obtains DOA. The effectiveness of the proposed algorithm is verified by the simulation results.