冲击噪声背景下频率和DOA的联合估计  

Frequency and DOA Simultaneous Estimation of LFM Signal under Impulse Noise

作　　者：张陆游[1] 张永顺[1] 张琳[1] 

机构地区：[1]空军工程大学导弹学院

出　　处：《空军工程大学学报（自然科学版）》2009年第3期43-46,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60601016);陕西省自然科学基金资助项目(SJ08F21)

摘　　要：为解决冲击噪声背景下的LFM信号频率和波达方向(DOA)联合估计问题,本文依据FLOM-时频分布理论和谱图重排方法,提出了一种基于FLOM-时频分布谱图重排的频率特性和DOA联合估计算法,该算法解决了时频分布DOA估计算法不能应用于冲击噪声的不足,能有效抑制交叉项影响,具有较好的时频聚集性能,算法通过频率拟合和时频平均-MUSIC算法可同时得到LFM信号的瞬时频率和DOA值,相比于目前已有的DOA算法,该算法具有更好的参数估计精度。计算机仿真试验证实了算法的有效性。To solve the problem of frequency trait and direction - of - arrival （DOA） simultaneous estimation of linear frequency modulated （LFM） signal under impulse noise, and according to the FLOM -Time Frequency Distri- bution （TFD） theory and spectrum reassigned method, a new algorithm of Frequency Trait and DOA Simultaneous Estimation is brought forward based on the reassigned FLOM -Time Frequency Distribution （TFD）. This algorithm can be applied in impulse noise environment, while the conventional Time Frequency Distribution DOA estimation methods can not. And the algorithm can be used to depress the influence of TFD cross -terms and is good in time - frequency collection. In using this algorithm, the LFM instantaneous frequency and DOA value can be obtained by frequency fitting and Time Frequency Average - MUSIC method. Compared with the similar DOA algorithms in existence, this algorithm is more accurate in estimation results. Simulation results show that the algorithm is effective.

关 键 词：波达方向 冲击噪声 时频分布谱图重排 频率拟合 

分 类 号：TN957[电子电信—信号与信息处理]