基于分数阶傅里叶变换的多分量Chirp信号的检测与参数估计  

The Detection and Parameter Estimation for Multi- component Chirp Signals Based on the Fractional Fourier Transforms

作　　者：于凤芹[1] 曹家麟[1] 

机构地区：[1]上海大学机械电子与自动化学院

出　　处：《电声技术》2004年第1期53-55,59,共4页Audio Engineering

基　　金：江苏省自然科学基金资助项目(BK2002068)

摘　　要：分数阶傅里叶变换是傅里叶变换的广义形式。利用Chirp信号在分数阶傅里叶变换域的特点,提出了对含有多个非平稳Chirp成分的信号在噪声中的检测与参数估计方法。理论分析和仿真结果表明,与现有的基于时间域、频率域和时频域的方法相比,该方法物理意义清楚,计算简便,无交叉项干扰,抗噪声性能强。The fractional Fourier transform is a generalization of the Fourier transform. In this paper,taking advantage of non-stationary feature of linear Chirp signal in the fractional Fourier transforms domain, the methods of detection and parameter estimation for noised multi-component Chirp nonstationary signals based on fractional Fourier transforms are proposed. Theoretic analysis and simulation results show that not only the meaning of this method is clear, but also its computation is simple, and it has no interference as well. It is good at reducing noise comparing with those in time domain or in frequency domain or in joint time-frequency domain.

关 键 词：分数阶傅里叶变换 多分量CHIRP信号 检测 参数估计 时频分析 抗噪声性 线性调频 

分 类 号：TN911.7[电子电信—通信与信息系统]