摘要
线性调频(LFM)信号的参数包括瞬时频率、起始频率和初始相位。提出了一种基于分数自相关的线性调频信号的参数提取算法。首先该算法通过计算LMF信号在旋转角α的分数自相关以及相对应的p序的积分,这样当有确定的角度α时,分数阶傅里叶变换(FrFT)域中会出现一个峰值;然后根据这个峰值检测到信号,同时能够把参数提取出来;最后通过仿真验证该算法的有效性。
The parameters of linear frequency modulated（LFM） signal include instantaneous frequency,initial frequency and initial phase.An algorithm for parameters extraction of linear FM signal based on fractional autocorrelation is proposed.The algorithm calculates the fractional autocorrelation at rotation angle α and the corresponding integral at the order of p,while a peak value is appeared at a certain angle α in fractional Fourier transform（FrFT） domain,then the signal can be detected and the parameters can be extracted.Finally,computer simulations validate the proposed algorithm.
出处
《测控技术》
CSCD
2016年第2期32-35,共4页
Measurement & Control Technology
关键词
分数阶傅里叶变换
分数自相关
线性调频信号
参数提取
fractional Fourier transform
fractional autocorrelation
linear frequency modulated signal
parameters extraction
