计算机应用 ›› 2013, Vol. 33 ›› Issue (05): 1230-1236.DOI: 10.3724/SP.J.1087.2013.01230

• 网络与通信 • 上一篇    下一篇

基于熵测度的跳频信号谱图分析

郭建涛,王林   

  1. 信阳师范学院 物理电子工程学院, 河南 信阳 464000
  • 收稿日期:2012-10-30 修回日期:2012-12-09 出版日期:2013-05-01 发布日期:2013-05-08
  • 通讯作者: 郭建涛
  • 作者简介:郭建涛(1973-),男,河南南阳人,副教授,博士,主要研究方向:通信信号处理、时频分析;王林(1962-),男,河南信阳人,副教授,主要研究方向:电磁场
  • 基金资助:

    河南省教育厅自然基金资助项目(2011A510021,13B510226);信阳师范学院高层次人才科研启动基金资助项目(09217)

Spectrogram analysis of frequency-hopping signals based on entropy measure

GUO Jiantao,WANG Lin   

  1. College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang Henan 464000, China
  • Received:2012-10-30 Revised:2012-12-09 Online:2013-05-08 Published:2013-05-01
  • Contact: GUO Jiantao

摘要: 为了有效分析跳频信号并估计其参数,依据跳频信号谱图和Wigner-Ville分布(WVD)的特征分析,提出了一种自适应跳频信号时频分析方法。该方法依据熵测度进行谱图窗函数宽度选择,获取优化的跳频信号谱图表示。理论分析和仿真结果表明,基于熵测度的谱图分析方法能够在大于0dB的高斯白噪声环境下,给出跳频周期参数的准确估计;与平滑伪Wigner分布及其自适应方法相比,该方法能够在较低信噪比下有效降低参数估计的方差,提高参数估计的准确性;同时对于长观测信号,具有更快的运算速度。

关键词: 跳频信号, 熵测度, 参数估计, 时频分析, 谱图

Abstract: To analyze and estimate the parameters of Frequency-Hopping (FH) signals effectively, an adaptive time-frequency analytical method was proposed according to the characteristics of FH signal spectrogram and Wigner-Ville Didtribution (WVD). The width of window function for spectrogram was selected based on entropy measure so as to obtain optimal spectrogram representation of FH signal. The theoretical analysis and simulation results show that the spectrum analytical method based on entropy measure could give accurate estimation of the hopping cycle of FH signal under the white Gaussian noise environment of greater than 0dB. Compared with Smoothed Pseudo WVD (SPWVD) and its adaptive method, the proposed method can effectively reduce the variance and improve the accuracy of parameter estimation at low Signal-to-Noise Ratio (SNR). While for long observation signal, it owns faster operation speed.

Key words: frequency-hopping signal, entropy measure, parameter estimation, time-frequency analysis, spectrogram

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