| 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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| 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. |
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| 作者姓名： | 赵兆 是湘全 |
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| 作者单位： | 南京理工大学,电子工程系,南京210094 |
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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.
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| 关 键 词： | 运动目标检测 时频分析 分数阶Fourier变换 伪Wigner分布 |
| 文章编号： | 1001-893X（2007）04-0095-04 |
| 收稿时间： | 1/1/2007 12:00:00 AM |
| 修稿时间： | 2007-01-012007-04-25 |
A Moving Targets Detection Algorithm Based on Fractional Fourier Transform (FRFT) |
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| ZHAO Zhao,SHI Xiang-quan.A Moving Targets Detection Algorithm Based on Fractional Fourier Transform (FRFT)[J].Telecommunication Engineering,2007,47(4):95-98. |
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| Authors: | ZHAO Zhao SHI Xiang-quan |
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| Affiliation: | Department of Electronic Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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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). |
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| Keywords: | moving targets detection(MTD) time-frequency analysis fractional Fourier transform(FRFT) PWD |
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