基于时频分布的电子侦察信道参数估计方法  

Channel estimation method for electronic reconnaissance based on time-frequency distribution

作　　者：江莉[1] 董惠[1] 李林[2] 刘利[1] 

机构地区：[1]西安建筑科技大学信息与控制工程学院,陕西西安710055 [2]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《航天电子对抗》2010年第4期26-29,共4页Aerospace Electronic Warfare

摘　　要：提出了一种基于时频分布的信道参数盲估计方法。首先分析了多径信道模型和时频域匹配滤波算法,接着根据时频分布自身项和交叉项的不同特点,提出采用短时傅里叶变换的时频图对Wigner-Ville分布进行滤波,以提取源信号的时频脊线,然后利用时频域匹配滤波对多径信号进行参数估计。该方法快速简单,参数估计准确,分辨率高。仿真实验对雷达脉内频率调制信号进行多径参数估计,实验结果证明了该方法的正确性和有效性。A channel parameter estimation method based on time-frequency distribution is proposed. First, multipath channel mode and match filtering in time-frequency domain are analyzed. Then according to the prop- erties of self and cross terms,the short time Fourier transform is used for filtering the Wigner-Ville distribution to extracting the time-frequency ridge of the source signal. This method is simple in calculation, accurate in pa- rameter estimation and high in resolution. Finally,Simulation experiments on radar intra-pulse linear frequency modulation signals and quartic frequency modulation signals verify the correctness and efficiency of the pro- posed method.

关 键 词：时频分布 多径信道 参数估计 瞬时频率 

分 类 号：TN971.1[电子电信—信号与信息处理]