| 基于FRFT距离压缩的高速目标ISAR成像 |
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| 引用本文： | 尹治平,张冬晨,王东进,陈卫东.基于FRFT距离压缩的高速目标ISAR成像[J].中国科学技术大学学报,2009,39(9). |
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| 作者姓名： | 尹治平 张冬晨 王东进 陈卫东 |
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| 作者单位： | 中国科学技术大学电子工程与信息科学系,安徽合肥,230027 |
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| 摘 要： | 通过建立高速运动目标的ISAR全去斜回波模型,分析了传统DFT距离压缩处理中所存在的距离色散问题及其对成像的影响.然后针对高速目标回波是调频斜率相同的多分量LFM信号的特点,提出了基于分数阶Fourier变换的距离压缩处理方法,并讨论了最优旋转角估计的问题.最后结合GRECO软件产生的回波数据进行仿真,证明了该方法能有效解决高速运动目标距离压缩中存在的色散问题,提高ISAR成像质量.
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| 关 键 词： | 分数阶Fourier变换 距离压缩 高速目标成像 逆合成孔径雷达 |
Range compression processing based on FRFT for ISAR imaging |
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| YIN Zhi-pin,ZHANG Dong-chen,WANG Dong-jin,CHEN Wei-dong.Range compression processing based on FRFT for ISAR imaging[J].Journal of University of Science and Technology of China,2009,39(9). |
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| Authors: | YIN Zhi-pin ZHANG Dong-chen WANG Dong-jin CHEN Wei-dong |
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| Abstract: | The echo signal of a fast-moving target was established.For the fast-moving target,range dispersion will occur in the DFT range compression,deriving from the high-speed radial motion,distort the range profile and defocus the ISAR image.A new reconstruction algorithm was proposed,which uses fractional Fourier transform (FRFT) instead of DFT to implement the range compression.The simulation results indicate that this new algorithm can avoid the range dispersion and achieve refocused ISAR images effectively. |
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| Keywords: | FRFT range compression imaging of fast-moving target ISAR |
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