基于MP分解的相干线性调频信号DOA估计  

DOA Estimation of Coherent LFM Signals Based on MP Decomposition

作　　者：吕雪[1] 王建英[2] 尹忠科[2] 

机构地区：[1]四川九洲电器集团责任有限公司,四川绵阳621000 [2]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《铁道学报》2008年第4期39-43,共5页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(60602043)

摘　　要：针对具有时变方向向量的相干线性调频信号,本文提出一种基于MP(Matching Pursuit)方法实现的DOA估计算法。根据线性调频信号形式和阵列结构分别建立过完备原子库,通过对阵列接收数据在原子库上的MP分解过程,寻找出每一步分解的最佳原子,进而由最佳原子的参数获得信号的DOA估计,该算法不需要采用空间平滑处理,估计性能优于传统空间时频分布(STFD)方法,尤其在欠采样、低信噪比、多信源情况下算法仍然有较高的估计精度。理论分析及计算机仿真结果验证了算法的有效性。A new method for the direction-of-arrival （DOA） estimation of coherent LFM signals with time-var- ying direction vectors based on Matching Pursuit（MP）signal sparse decomposition is presented. DOA estima- tion is made by decomposing the array output over an over-complete matrix dictionary for the beat atom at each step of MP, the atoms of the dictionary are matrixes established according to the LFM signals~ frequency pa- rameters and array geometry. This method need not apply spatial smoothing, it has higher precision than the conventional spatial time-frequency distribution （STFD） based methods, especially in the case of lower SNR, multiple signals and insufficient samples. Theoretic analysis and numerical simulations are provided to demonstrate the effectiveness of the proposed algorithm.

关 键 词：线性调频信号 相干源 匹配跟踪 DOA估计 

分 类 号：TN911[电子电信—通信与信息系统]