一种多分量跳频信号参数盲估计方法  

A New Method for Blind Parameter Estimation of Multicomponent Frequency-Hopping Signals

作　　者：陈利虎[1] 张尔扬[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2009年第2期194-198,共5页Journal of Signal Processing

摘　　要：首先提出了将谱图与平滑伪Wigner-Ville分布(SPWVD)组合,利用谱图的无交叉项和SPWVD的时频聚焦性能,得到了一种清晰稳健的时频分布;然后基于此分布运用二维二次差分峰值检测方法检测出该时频图的峰值,并利用求平面重心的方法修正峰值,得到正确的峰值位置;将峰值分别在频率轴上和时间轴投影,即可得到信号载频的估计值和每跳的中心时刻(CT,central time);最后采用逐次CT差值直方图法得到跳周期(HD,hop duration)的估计,并根据估计出的跳周期值和每跳的CT值得到跳时(hop timing)估计。First, a new time-frequency analysis method, spectrogram and smoothed pseudo WVD synthesis is proposed,which can obtain robust results with good time-frequency concentration and suppression cross-term interference performance. Second, the peaks of time-frequency distribution are detected based on 2-D （two-dimensional） quadratic difference method. The projection of every peak on the frequency-axis is the estimation of carrier frequency, and the projection on the time-axis is hop duration＇ s central time （CT）. Third, the estimation of hop duration based on sequential CT differences histogram is given. At last, the hop timing can be estimated by the sta- tistical remainders of CTs divided by the hop duration＇ s estimation. The simulation results demonstrate that the estimation algorithm is effective and efficient.

关 键 词：跳频 时频分析 时频聚焦性 交叉项干扰 跳周期 

分 类 号：TN911.1[电子电信—通信与信息系统]