摘要
为了有效分析跳频信号并估计其参数,根据跳频信号的特点,提出了一种基于频率分解的组合时频分布.这种新的时频分布先将多分量跳频信号通过带通滤波变成多个单分量信号,再将每个分量的Wigner-Ville分布线性叠加.理论分析和仿真结果表明,这种新的组合时频分布能够有效抑制跳频信号的交叉项干扰.与现有的方法相比,具有更高的时频分辨率,更适合于跳频信号的时频分析和参数估计.
To estimate the parameters of frequency-hopping signals, a new combination of Wigner-Ville distribution based on frequency decomposition is put forward according to the characteristics of frequencyhopping signals. First, a multi-component frequency-hopping signal is decomposed into multiple singlecomponent signals with a group of band filters. Then the WVD of each component is summed up to form a new time-frequency distribution. Theoretical analysis and simulation result show that the new combination of Wigner-Ville distribution is effective to the reduction in cross-term interference of frequency-hopping signals. Compared with the existing method, this new method preserves a higher time-frequency resolution. Therefore, it is more suitable to time-frequency analysis and parameter estimation of frequency-hopping signals.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2010年第6期1137-1142,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(60672132
60872149)
关键词
跳频信号
组合时频分布
交叉项
时频分辨率
frequency-hopping signals
combination of Wigner-Ville distribution
cross-term
timefrequency resolution
