阵列天线自适应波束形成的一种改进方法  

An Improved Adaptive Beamforming Algorithm of Array Antenna

作　　者：谭晓斐[1] 田北京[1] 王彤[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《雷达科学与技术》2008年第4期297-301,共5页Radar Science and Technology

基　　金：国家重点实验室基金(No.9140C010403060C01)

摘　　要：介绍了矩阵求逆(SMI)的阵列天线自适应数字波束(DBF)形成的一种旁瓣抑制的方法。由于信号协方差矩阵估计误差的存在,自适应方法形成的波束会产生畸变,随着杂波小特征值发散程度的增加,有时形成的自适应波束会出现较高的旁瓣。文中重点分析了波束发生畸变的原因并提出了旁瓣抑制的一种改进方法,算法有效地对协方差矩阵估计进行了修正。仿真结果表明存在干扰的情况下,当迭代次数和迭代增益大小选择适当时,该方法能有效地降低自适应旁瓣高度,而且不会对干扰零深产生明显影响,增强了空时波束形成算法的鲁棒性。A method to DBF of SMI algorithm based on array antenna to lower the height of sidelobe is proposed. There are two problems：the performance degradation caused by the existence of errors in covariante, and the appearance of high sidelobes with the increase of small eigenvalues of clutter. A method to effectively control the height of sidelobe through amending the estimated covariance of clutter is proposed through analysis of the reason of beam-aberrance. The simulation results validate the effectiveness of the proposed method to suppress the sidelobe height in adaptive pattern without influences on the nulling depth of the interference when iteration times iteration gain are proper.

关 键 词：空时自适应 波束形成 线阵 迭代增益 

分 类 号：TN957[电子电信—信号与信息处理] TP274[电子电信—信息与通信工程]