基于分数阶Fourier变换的多分量LFM信号检测与参数估计  

Multicomponent LFM Signal Detection and Parameter Estimation Based on Fractional Fourier Transform

作　　者：章步云[1] 刘爱芳[1] 朱晓华[1] 刘中[1] 

机构地区：[1]南京理工大学电子工程系,南京210094

出　　处：《数据采集与处理》2003年第4期408-411,共4页Journal of Data Acquisition and Processing

摘　　要：介绍了分数阶 Fourier变换的基本原理和基本性质 ,提出了基于分数阶 Fourier变换的多分量 LFM信号检测和参数估计方法。为了解决多个 LFM分量之间的相互影响问题 ,特别是强分量掩盖弱分量的问题 ,本文还提出了一种结合逐次消去思想和分数阶 Fourier变换的多分量 LFM信号检测和参数估计算法 ,它可以解决强度相差较大的多分量 LFM信号中检测和估计弱 LFM分量参数的问题。The detection and parameter estimation of multicomponent LFM signals is extensively discussed. This paper firstly introduces the basic theory and the basic properties of the fractional Fourier transform (FrFT), then a new method for multicomponent LFM signal detection and parameter estimation based on fractional Fourier transform is proposed. To eliminate the mutual effects of multiple LFM components, especially the strong LFM signal to weak LFM signal, a novel scheme combining the idea of elimination one by one with the fractional Fourier transform is presented, which can effectively detect weak LFM signals and estimate their parameters among some strong LFM signals. Simulational results show its effectivity.

关 键 词：信号处理 参数估计 分数阶FOURIER变换 多分量LFM信号 信号检测 

分 类 号：TN911.7[电子电信—通信与信息系统]