一种基于子阵列合成的DOA估计算法  

A Subarray-Synthesis Based DOA Estimation Algorithm

作　　者：许文龙[1] 蒋伟[1] 尚勇[1] 项海格[1] 

机构地区：[1]北京大学电子学系卫星通信研究室,北京100871

出　　处：《电子学报》2006年第9期1571-1577,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60462002;60302006)

摘　　要：在卫星通信中,由于星上资源有限,导致星载信号处理接收机的数目一般少于阵列天线的阵元数.在某些应用中需要在这样的条件下实现DOA估计:信号达波数大于星载信号处理接收机数目但是可能小于阵列天线的阵元数.实质上是要求能够用较少数量的接收机进行接收、处理含有较多阵元的阵列天线上的信号.针对这类应用要求,本文提出一种基于子阵列合成的DOA估计算法.通过子阵列输出协方差矩阵合成等效的大阵列输出协方差矩阵,基于等效大阵列输出协方差矩阵实现达波DOA超分辨率估计;讨论了子阵列天线选择优化问题.对算法性能进行了仿真验证,结果表明算法是有效的.In some satellite communications applications, we need to perform Direction of Arrival （DOA） angle estimation under the restriction that shorting of receivers when receiving and processing the signals impinged on an array antenna. In essence, this demands that using a limited number of receivers to process a large number of DOA signal. This paper proposes a method named Subarray synthesis based Direction of Arrival angle estimation. An equivalent output covariance matrix is firstly synthesized based on a given set of subarray antennas＇ output covariance matrices;impinged signal＇ s DOA estimation is then performed based on the equivalent covariance matrix; Subarray optimization criteflon and method are also discussed. Monte Carlo simulations verified the effectiveness of the estimation method.

关 键 词：阵列信号处理 DOA估计 子阵列合成 时分复用TDM 特征空间分解 

分 类 号：TN927[电子电信—通信与信息系统]