基于Chirp-Fourier变换的LFM信号的参数估计  

Parameter Estimation of LFM Signal Based on the Chirp-Fourier Transform

作　　者：于凤芹[1,2] 陈光化[1] 曹家麟[1] 

机构地区：[1]上海大学机械电子与自动化学院,上海200072 [2]江南大学通信与控制学院,江苏无锡214036

出　　处：《电子测量与仪器学报》2003年第3期75-79,共5页Journal of Electronic Measurement and Instrumentation

基　　金：江苏省自然科学基金项目 (编号为 :BK2 0 0 2 0 68)

摘　　要：本文从匹配Fourier变换的角度给出了Chirp -Fourier变换的定义、意义和离散实现。分析表明 ,LFM信号的Chirp -Fourier变换的峰值对应的坐标即为其初始频率和调频斜率 ,所以应用Chirp -Fourier变换可以估计LFM信号的参数。仿真试验表明 ,应用Chirp -Fourier变换不但可以有效地估计LFM信号的参数 ,而且有很好的抗噪声干扰能力。The definition, physical senses and discrete form of Chirp-Fourier transform are discussed from the point of view of match Fourier transform. Analysis results show that the peak of LFM signal Chirp- Fourier transform accords with original frequency and slope of frequency modulation. So the parameters of LFM signals can be estimated using Chirp-Fourier transform. Simulation results have showed that this method is not only of accurate estimation of the parameter, but also good at reducing noisy.

关 键 词：LFM信号 参数估计 匹配Fourier变换 Chirp-Fourier变换 离散CHIRP-FOURIER变换 线性调频信号 

分 类 号：TN911.6[电子电信—通信与信息系统]