A low angle estimation method based on beam-space domain in very high frequency (VHF) multiple-input multiple-output (MWO) radar is proposed. The multipath signal model for MEMO radar is constructed with both transmitted multipath and received multipath signals being considered.Firstly,some receiving beams are formed. Secondly,a matched filterbank is used to extract the transmitted orthogonal waveform components.Thirdly,some transmitting beams are formed at the receiving side.Thus, the array data is mapped from element space into beam space. Finally, a modified generalized multiple signal classification (MUSIC) algorithm is developed for angle estimation after beam-space pre-processing.Compared with the element-space processing, the proposed algorithm has nearly the same estimation precision and owns lower computational burden. Theoretical analysis and computer simulation results demonstrate the merits of the new algorithm.%针对米波多输入多输出(Multiple-Input Multiple-Output,MIMO)雷达低仰角估计的问题,提出了一种基于波束空间的角度估计算法.结合米波MIMO雷达低仰角目标的回波特点,建立了同时考虑发射多径和接收多径的信号模型.算法首先在接收端形成多个接收波束,再利用发射信号进行匹配滤波,然后在接收端形成多个发射波束,将接收数据由阵元空间映射到波束空间,最后利用改进的广义多重信号分类算法进行角度估计.与基于阵元空间的算法相比,该算法在基本不损失角度估计精度的同时,大大降低了运算量.理论分析和仿真结果表明了该算法的优越性.
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