一种准平稳相干信号的DOA估计算法  

A DOA ESTIMATION METHOD OF QUASI-STATIONARY COHERENT SIGNALS

作　　者：张辰锐 王剑书 雷涛[3,4] Zhang Chenrui 1,Wang Jianshu 2, Lei Tao 3,4(1Department of Physics, Luliang University, Lvliang 033000, Shanxi, China;2School of Electronics and Information, Northwestern Polytechnical University, Xi an 710129, Shaanxi, China;3School of Electronics and Information Engineering, Shaanxi University of Science and Technology, Xi an 710021, Shaanxi, China;4School of Electronics and Information Engineering, Lanzhou Jiaotong University,Lanzhou 730070, Gansu, China)

机构地区：[1]吕梁学院物理系,山西吕梁033000 [2]西北工业大学电子信息工程学院,陕西西安710129 [3]陕西科技大学电气与信息工程学院,陕西西安710021 [4]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《计算机应用与软件》2018年第7期76-80,193,共6页Computer Applications and Software

基　　金：国家自然科学基金项目(61461025;61202314);西北工业大学博士论文创新基金项目(CX201617);吕梁学院校内青年基金项目(ZRQN201518;ZRXN201414);吕梁学院教学改革创新项目(JXGG201825)

摘　　要：针对相干准平稳信号、相关噪声环境,提出一种基于Khatri-Rao(KR)子空间和前后向空间平滑的波达方向估计方法。该方法对接收信号进行分帧,并假设各帧内信号是平稳的,通过帧内信号的协方差矩阵构造新的Toeplitz矩阵;通过KR子空间方法将各帧Toeplitz矩阵组合成新的信号模型,该模型可抑制噪声的影响;通过前后向空间平滑求解出信号的来向;同时,方法也扩展到了宽带阵列信号模型。实验结果表明,在准平稳相干源与相关噪声的条件下,所提方法具有更高的检测概率和更低均方根误差,宽带阵列信号模型实验也验证了该方法的有效性。A direction of arrival estimation method based on Khatri-Rao（ KR） subspace and forward/backward spatial smoothing was proposed for quasi-stationary coherent signals and correlated noise. The observed signals were divided into frames. Assuming that the signal of each frame was stationary,a new Toeplitz matrix was constructed by the corresponding covariance matrix of each frame. A new signal model which could eliminate the noise was built through the KR subspace method,and the directions of source signals were estimated by forward/backward spatial smoothing method. Meanwhile,the proposed method was expanded to suit the wideband array signal model. The experiment result shows that the proposed method has a better probability of detection and less mean root square error under the conditions of quasi-stationary coherent signals and correlated noise. And the effectiveness of the proposed method is verified by the wideband array signal model experiment.

关 键 词：波达方向估计 准平稳相干信号 相关噪声 KR子空间 空间平滑 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]