冲击噪声背景下独立信号与相干信号并存的测向自适应新方法  

DOA estimation for uncorrelated and coherent signals in impulsive noise

作　　者：刁鸣[1] 刘磊[1,2] 安春莲[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]泰山学院物理与电子工程学院,山东泰安271000

出　　处：《中南大学学报（自然科学版）》2016年第1期108-113,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(61571149);中央高校基本科研业务费专项基金资助项目(HEUCF1508)~~

摘　　要：根据冲击噪声的幅值特点和快拍数数量,通过对阵列接收数据进行去冲击预处理后进行数据重构,提出一种冲击噪声背景下独立信号与相干信号并存的DOA估计的新自适应方法。首先,估计出阵列接收数据中信号成分的幅值上限;然后,对阵列接收数据中受到冲击噪声影响的数据进行归一化处理,削弱冲击噪声;最后,根据快拍数量对噪声残差数据进行采样后重构信号,利用传统的二阶统计量方法分别对独立信号和相干信号进行达波方向(DOA)估计。研究结果表明:该方法阵列利用率较高,估计性能好,且在强冲击噪声环境和小快拍数下仍然具有良好的估计性能。An effective self-adaptive method was proposed to eliminate the impulsive noise. Firstly, a threshold value was set up according to the amplitude feature of the array received data. Then, the amplitude of the array received data, whose amplitude is higher than the threshold value, was modified as the threshold value, and the residual noise was re-sampled to reconstruct the data according to the number of snapshot. Finally, the common second-order statistics method was utilized to estimate the directions of arrival（DOAs）, and the DOAs of the uncorrelated and coherent signals were estimated separately. The results show that the proposed method is effective in the presence of strong impulsive noise and fewer snapshots.

关 键 词：DOA估计 冲击噪声 独立信号 相干信号 二阶统计量 分数低阶统计量 

分 类 号：TN911.7[电子电信—通信与信息系统]