基于分数阶傅里叶变换的ISAR横向定标
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摘要
逆合成孔径雷达的横向定标是确定横向像素代表的真实尺寸、进行目标几何特征提取的前提。本文研究了一种基于分数阶傅里叶变换(Fractional Fourier transform,Fr FT)的横向定标方法,利用回波信号在慢时间域为线性调频信号的特性,使用Fr FT方法得到信号在不同分数阶傅里叶域的能量聚集性,估计目标回波信号多普勒调频率,求得转动角速度,进而完成横向定标。仿真实验验证了算法的有效性和准确性。
Cross-range scaling of the inverse synthetic aperture radar(ISAR) determines the real size of one cross-range unit,by which the geometry character of the target can be obtained. Considering the linear frequency modulation of the echo signal in slow-time domain,a new approach based on fractional Fourier transform(FrFT)is proposed for cross-range scaling. The approach estimates the chirp rate of the Doppler history and the target rotation vector according to the energy concentration property of the signal in the different fractional Fourier domain.The simulation results show that the algorithm is effective and accurate.
Cross-range scaling of the inverse synthetic aperture radar(ISAR) determines the real size of one cross-range unit,by which the geometry character of the target can be obtained. Considering the linear frequency modulation of the echo signal in slow-time domain,a new approach based on fractional Fourier transform(FrFT)is proposed for cross-range scaling. The approach estimates the chirp rate of the Doppler history and the target rotation vector according to the energy concentration property of the signal in the different fractional Fourier domain.The simulation results show that the algorithm is effective and accurate.
引文
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[8]莫正军,涂亚庆,刘良兵,等.基于重叠分段和Fr FT的VCO非线性度检测方法[J].数据采集与处理,2012,27(1):96-100.Mo Zhengjun,Tu Yaqing,Liu Liangbing,et al.VCO nonlinearity detection method based on overlapped subsection and Fr FT[J].Journal of Data Acquisition and Processing,2012,27(1):96-100.
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[11]Hou Huiling,Pang Cunsuo,Guo Hualing,et al.Study on high-speed and multi-target detection algorithm based on STFT and FRFT combination[J].Optic-International Journal for Light and Electron Optics,2016,127(2):713-717.
[12]郭斌.分数阶Fourier变换的基本原理和应用[D].成都:电子科技大学,2006:5-7.Guo Bin.Fundamental principle and application of fractional Fourier transform[D].Chengdu:University of Electronic Science and Technology of China,2006:5-7.
[13]陈艳丽,郭良浩,宫在晓.简明分数阶傅里叶变换及其对线性调频信号的检测和参数估计[J].声学学报,2015,40(6):761-771.Chen Yanli,Guo Lianghao,Gong Zaixiao,The concise fractional Fourier transform and its application in detection and parameter estimation of the linear frequency-modulated signal[J].Acta Acustica,2015,40(6):761-771.
[14]章步云,刘爱芳,朱晓华,等.基于分数阶Fourier变换的多分量LFM信号检测与参数估计[J].数据采集与处理,2003,18(4):408-411.Zhang Buyun,Liu Aifang,Zhu Xiaohua,et al.Multicomponent LFM signal detection and parameter estimation based on fractional Fourier transform[J].Journal of Data Acquisition and Processing,2003,18(4):408-411.
[15]陶然,邓兵,王越.分数阶傅里叶变换及其应用[M].北京:清华大学出版社,2009:98-103.Tao Ran,Deng Bing,Wang Yue.Fractional Fourier transform and its application[M].Beijing:Tsinghua University Press,2009:98-103.
[2]吕少霞.ISAR成像的横向定标算法研究[D].哈尔滨:哈尔滨工业大学,2007:6-12.LüShaoxia.Cross-range scaling algorithm based on ISAR imaging[D].Harbin:Harbin Institute of Technology,2007:6-12.
[3]Jiang Zhenglin,Bao Zheng.A new method of cross-range scaling of low resolution radar[J].Journal of Electronics&Information Technology,2001,23(4):365-372.
[4]佘志舜,朱兆达.逆合成孔径雷达横向距离定标[J].电子学报,1997,25(3):45-48.She Zhishun,Zhu Zhaoda.Cross-range scaling of inverse synthetic aperture radar[J].Acta Electronica Sinica,1997,25(3):45-48.
[5]Yuh C M,Xu Jia,Peng Yingning,et al.Cross-range scaling for ISAR based on image rotation correlation[J].IEEE Geoscience and Remote Sensing Letters,2009,6(3):597-601.
[6]Martorella M.Novel approach for ISAR image cross-range scaling[J].IEEE Transactions on Aerospace and Electronic Systems,2008,44(1):281-294.
[7]汪玲.逆合成孔径雷达成像关键技术研究[D].南京:南京航空航天大学,2006:61-70.Wang Ling.Study on key technologies of inverse synthetic aperture radar imaging[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2006:61-70.
[8]莫正军,涂亚庆,刘良兵,等.基于重叠分段和Fr FT的VCO非线性度检测方法[J].数据采集与处理,2012,27(1):96-100.Mo Zhengjun,Tu Yaqing,Liu Liangbing,et al.VCO nonlinearity detection method based on overlapped subsection and Fr FT[J].Journal of Data Acquisition and Processing,2012,27(1):96-100.
[9]邵高平,安建平.基于FFT和FRFT的非平稳干扰估计和抑制[J].数据采集与处理,2010,25(2):160-164.Shao Gaoping,An Jianping.Estimation and suppression of broadband non-stationary interference based on FFT and FRFT[J].Journal of Data Acquisition and Processing,2010,25(2):160-164.
[10]Zhao Yanbo,Yu Hua,Wei Gang,et al.FRFT-based parameter estimation of time-varying wideband underwater acoustic multipath channels[C]∥International Conference on Underwater Networks and Systems.Arlington:ACM,2015,9:22-24.
[11]Hou Huiling,Pang Cunsuo,Guo Hualing,et al.Study on high-speed and multi-target detection algorithm based on STFT and FRFT combination[J].Optic-International Journal for Light and Electron Optics,2016,127(2):713-717.
[12]郭斌.分数阶Fourier变换的基本原理和应用[D].成都:电子科技大学,2006:5-7.Guo Bin.Fundamental principle and application of fractional Fourier transform[D].Chengdu:University of Electronic Science and Technology of China,2006:5-7.
[13]陈艳丽,郭良浩,宫在晓.简明分数阶傅里叶变换及其对线性调频信号的检测和参数估计[J].声学学报,2015,40(6):761-771.Chen Yanli,Guo Lianghao,Gong Zaixiao,The concise fractional Fourier transform and its application in detection and parameter estimation of the linear frequency-modulated signal[J].Acta Acustica,2015,40(6):761-771.
[14]章步云,刘爱芳,朱晓华,等.基于分数阶Fourier变换的多分量LFM信号检测与参数估计[J].数据采集与处理,2003,18(4):408-411.Zhang Buyun,Liu Aifang,Zhu Xiaohua,et al.Multicomponent LFM signal detection and parameter estimation based on fractional Fourier transform[J].Journal of Data Acquisition and Processing,2003,18(4):408-411.
[15]陶然,邓兵,王越.分数阶傅里叶变换及其应用[M].北京:清华大学出版社,2009:98-103.Tao Ran,Deng Bing,Wang Yue.Fractional Fourier transform and its application[M].Beijing:Tsinghua University Press,2009:98-103.