基于子空间估计的MIMO阵列降维STAP方法  

Reduced-rank STAP method for MIMO array based on estimation of subspace

作　　者：高伟[1] 黄建国[1] 王海强[1] 张群飞[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《系统工程与电子技术》2012年第5期876-881,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(60972152)资助课题

摘　　要：当对多输入多输出(multiple input multiple output,MIMO)阵列进行空时自适应处理时,由于MI-MO阵列虚拟孔径增大,相对常规相控阵列能够更好地抑制杂波和干扰,但其所需样本数据量大且计算复杂度高,工程实际中难以应用。提出基于子空间估计的MIMO阵列降维空间自适应处理(space time adaptive process-ing,STAP)方法,该方法结合扁长椭球波函数的时限带限特性近似构造出降维的杂波子空间,并利用与发射波形正交的辅助匹配滤波通道估计出干扰加噪声协方差矩阵,通过"逼零"方法求得MIMO阵列系统的空时权矢量。仿真结果表明,当存在非理想因素影响时,该方法能够有效抑制杂波和干扰且降维运算量更低。As the result of the extended virtual array aperture for multiple input multiple output（MIMO） array,the MIMO array can further suppress the clutter and jammer compared with the conventional phased-array.In practice it is difficult to use because of needing more sample support and higher computational complexity.A reduced-rank MIMO space time adaptive processing（STAP） method is proposed based on jammer estimated subspace.The method utilizes the characteristics of the time-limited and band-limited of prolate spheroidal wave function（PSWF） to approximate the clutter subspace.The MIMO system space-time weight is obtained by the ＂zero-forcing＂ method,and the covariance matrix containing jammer and noise is acquired through the matched filter orthogonal to all transmitted independent signal waveforms.The simulation results demonstrate that the proposed method can effectively suppress the clutter and jammer and has lower computational complexity.

关 键 词：多输入多输出阵列 空时自适应处理 扁长椭球波函数 子空间估计 

分 类 号：TN911.7[电子电信—通信与信息系统]