J4 ›› 2010, Vol. 37 ›› Issue (6): 1137-1142.doi: 10.3969/j.issn.1001-2400.2010.06.028

• 研究论文 • 上一篇    下一篇

一种组合时频分布在跳频信号参数估计中的应用

冯涛1,2;袁超伟1   

  1. (1. 北京邮电大学 信息与通信工程学院,北京  100876;
    2. 中国电科集团第54研究所,河北 石家庄  050081)
  • 收稿日期:2009-11-30 出版日期:2010-12-20 发布日期:2011-01-22
  • 通讯作者: 冯涛
  • 作者简介:冯涛(1971-),女,高级工程师,北京邮电大学博士研究生,E-mail: fengtao54@sina.com.
  • 基金资助:

    国家自然科学基金资助项目(60672132,60872149)

Combination of  Wigner-Ville distribution and its application to blind parameter estimation of frequency-hopping signals

FENG Tao1,2;YUAN Chao-wei1   

  1. (1. School of Info. and Comm. Eng., Beijing Univ. of Posts and Tele., Beijing  100876, China;
    2. 54th Research Inst. of the Chinese Electronic Tech. Corp. , Shijiazhuang  050081, China)
  • Received:2009-11-30 Online:2010-12-20 Published:2011-01-22
  • Contact: FENG Tao

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.

关键词: 跳频信号, 组合时频分布, 交叉项, 时频分辨率

Abstract:

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 frequency-hopping signals. First, a multi-component frequency-hopping signal is decomposed into multiple single-component 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.

Key words: frequency-hopping signals, combination of Wigner-Ville distribution, cross-term, time-frequency resolution