基于投影预变换的快速DOA估计算法  

Rapid DOA estimation algorithm based on projection pretransformation

作　　者：齐崇英[1] 陈志杰[1] 张永顺[2] 陈西宏[2] 

机构地区：[1]空军装备研究院雷达研究所,北京100085 [2]空军工程大学导弹学院,陕西三原713800

出　　处：《系统工程与电子技术》2006年第4期525-528,共4页Systems Engineering and Electronics

基　　金：空军装备部科研项目基金资助课题(KJ02132)

摘　　要：利用信源分布的先验信息,提出了一种基于投影预变换的快速DOA估计算法(projection pretransfor-mation method,PPTM),它将存在阵的输出数据向量变换到低维阵列流形的输出数据向量,降维变换后可明显减小DOA估计算法的运算量,并可提高谱分辨力。基于虚拟interpolate思想,将该方法进一步应用到整个阵列空域,在每一子空域实施降维投影变换,可大大减小谱估计算法的运算量。计算机仿真结果表明,PPTM比常规空间谱估计算法具有更好的分辨性能和更低的信噪比门限。A projection pretransformation method（PPTM） is proposed. By transforming the data output vector of an existing array into the output data vector of a lower-dimension array, the computational complexity of DOA estimation is reduced and the spectral resolution is improved. Based on the idea of virtual interpolate transformation, the new method is applied to the whole array field. In each subspace, the computational complexity of spectral estimation algorithm is further reduced by using PPTM. Computer simulation results demonstrate that the PPTM possesses a better resolving performance and a lower SNR threshold than conventional methods.

关 键 词：波达方向估计 投影预变换 信号处理 

分 类 号：TN911.7[电子电信—通信与信息系统]