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引用本文：

赵兆,是湘全.一种基于分数阶Fourier变换的雷达运动目标检测算法[J].电讯技术，2007，47（4）：95 - 98. [点击复制]
.A Moving Targets Detection Algorithm Based on Fractional Fourier Transform (FRFT)[J].，2007，47（4）：95 - 98. [点击复制]

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一种基于分数阶Fourier变换的雷达运动目标检测算法

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摘要:

针对雷达回波为多分量LFM信号时,时频分析存在的交叉项干扰问题,提出了一种基于分数阶Fourier变换(Fractional Fourier Transform,FRFT)的伪Wigner分布(PWD).该方法通过在参数平面按阈值进行峰值搜索确定变换域阶次,再在相应的分数阶Fourier域计算PWD,有效地抑制了交叉项的干扰,有利于更好地提取信号的时频信息.仿真实验证明了在强背景噪声下该算法的有效性.

关键词: 运动目标检测时频分析分数阶Fourier变换伪Wigner分布

DOI：10.3969/j.issn.1001-893X.

投稿时间：2007-01-01修订日期：2007-04-25

基金项目:

A Moving Targets Detection Algorithm Based on Fractional Fourier Transform (FRFT)

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Abstract:

In order to eliminate the interference of cross-terms during time-frequency analysis on multicomponent LFM signals,a new PWD(peudo Wigner distribution)in fractional Fourier transform(FRFT)domain is proposed.After 2-dimensional search on parameter plane,the transformation orders are determined.Then,PWD in corrsponding FRFT domain is calculated.The interference of cross-terms is effectively eliminated.Simulation results prove that it is effective with low signal-to-noise ratio(SNR).

Key words: moving targets detection(MTD),time-frequency analysis,fractional Fourier transform(FRFT),PWD