基于差分和斜投影的信源DOA分步估计方法  

A Method of DOA Stepped Estimation Based on Difference and Oblique Projector

作　　者：巨春飞[1] 王凯[2] 

机构地区：[1]西京学院工程技术系,西安710123 [2]空军工程大学导弹学院,陕西三原713800

出　　处：《现代雷达》2009年第3期34-37,共4页Modern Radar

基　　金：国家自然科学基金项目(60601016);国家"863"计划资助项目(2006AA701307)

摘　　要：提出一种色噪声背景下,同时存在独立、相关和相干信源的DOA分步估计方法。该算法利用常规谱估计算法估计独立和相关(非相干)信源,然后用差分方法排除掉协方差矩阵具有Toep litz结构的噪声和独立源信息,在利用斜投影算子的方法去除相关信源后,对剩余的相干信源采用修正平滑算法恢复为满秩。该算法在提高阵列的信源过载能力的同时,可避免重复估计相关信源。计算机仿真结果证明了新算法的有效性和正确性。A DOA estimation method is proposed for uncorrelated, correlated and coherent sources coexisting in colored noise background. The uncorrelated and correlated sources are first estimated using coventional spatial spectrum estimation methods, then the noise and uncorrelated sources which have Toeplitz structure are eliminated with differencing. Finally, by exploiting the property of oblique projection, the contributions of correlated sources are eliminated from the eovariance matrix and only the coherent sources remain. So the coherent sources can be estimated by the technique of modified spatial smoothing. The number of sources obtained by this approach can exceed the number of array elements, thus avoiding repeatedly estimation of correlated sources. Simulation results demonstrate the effectiveness and efficiency of our proposed methods.

关 键 词：空间差分 斜投影算子 Toeplitz特性 DOA估计 

分 类 号：TN911.23[电子电信—通信与信息系统]