摘要
分数阶Fourier变换作为最新提出的一种分析工具,其变换域同时具有信号的时域信息和频域信息,其实质是Fourier变换的一种广义形式,较适合处理非平稳信号。文中提出一种基于分数阶Fourier变换的多分量LFM信号参数估计与分离方法。通过在分数阶Fourier域搜索峰值点来对多分量LFM信号进行检测和参数估计,同时结合逐次消去思想来分离多个未知参数的LFM信号,抑制了强信号分量对弱信号分量的遮蔽干扰。
As a tool of analysis,Fractional Fourier transform is put forward lately. Its transform domain both has the time domain and frequency domain information of the signal. Essentially it is a generalized form of Fourier transform suitable for processing unstable LFM signal. By searching for the peaks in the fractional Fourier domain,the multi-component LFM signal detection and parameter estimation is done. And the successive elimination thought is adopted to separate LFM signals with multiple unknown parameters. The interference of strong signal components with the weak signal components are restrained.
出处
《电子科技》
2014年第10期133-135,共3页
Electronic Science and Technology
关键词
分数阶FOURIER变换
LFM信号
参数估计
fractional Fourier transform
linear frequency modulation signal
parameter estimation
