摘要
宽带非平稳干扰LFM信号对DSSS系统通信性能威胁较大,为抑制其干扰,必须估算LFM信号参数。在此介绍了几种时频表示方法及其特点,然后采用Radon变换或Hough变换相结合的方法进行LFM信号参数估计,讨论了LFM参数估算过程对时频表示方法的要求。分析表明,选择适当的函数是时频分布估计LFM信号参数的重点,分数傅里叶变换有相对好的LFM信号参数估计性能。
As the non-stationary LFM jamming signal is a threat to the DSSS communication system, its parameters should be estimated for the further elimination of interferene. Several time frequency representations and their characteristics are introduced. The Radon transform or Radon transform connecting with Hough transform is adopted to estimate the LFM signal parameters. The requirement of the time-frequency representations for estimating LFM parameters is analyzed. The a- nalysis result shows that when the LFM parameters are estimated on the basis of time-frequency distribution, the selection of the proper function is the most important, and the fractional Fourier transform has the relative fine performance.
出处
《现代电子技术》
2010年第20期150-152,156,共4页
Modern Electronics Technique
关键词
时频表示
时频分布
线性调频
LFM信号
time-frequency representation
time frequency distribution
linear frequency modulation
LFM signal
