| 基于分数阶Fourier变换的机载SAR运动目标检测 |
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| 引用本文： | 孙泓波, 顾红, 苏卫民, 刘国岁. 基于分数阶Fourier变换的机载SAR运动目标检测[J]. 电子与信息学报, 2002, 24(8): 1060-1065. |
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| 作者姓名： | 孙泓波 顾红 苏卫民 刘国岁 |
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| 作者单位： | 南京理工大学电子工程技术研究中心,南京,210094;南京理工大学电子工程技术研究中心,南京,210094;南京理工大学电子工程技术研究中心,南京,210094;南京理工大学电子工程技术研究中心,南京,210094 |
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| 基金项目： | “雷达信号处理国防科技重点实验室基金”(No.99JS01.4.1.DZ2401) |
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| 摘 要： | 该文首先建立了机载合成孔径雷达(SAR)对运动目标的回波信号模型,阐述了其本质为线性调频信号的特点。根据这种特点,提出了一种基于分数阶Fourier变换的机载SAR运动目标检测新方法,有效地消除了线性调频信号的时频耦合特性对信号检测的影响。与双线性时频分布类算法相比,分数阶Fourier变换是线性变换,在多运动目标存在的情况下,不会受到交叉项的影响。仿真结果验证了算法的有效性。
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| 关 键 词： | 分数阶Fourier变换 合成孔径雷达 运动目标检测 |
| 收稿时间： | 2001-04-09 |
| 修稿时间： | 2001-04-09 |
The airborne sar moving target detection based on fractional fourier transform |
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| Sun Hongbo, Gu Hong, Su Weimin, Liu Guosui. The airborne sar moving target detection based on fractional fourier transform[J]. Journal of Electronics & Information Technology, 2002, 24(8): 1060-1065. |
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| Authors: | Sun Hongbo Gu Hong Su Weimin Liu Guosui |
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| Affiliation: | Res. Center of Electron. Eng. Tech., Nanjing Univ. of Sci. and Tech., Nanjing 210094 China |
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| Abstract: | In this paper, the signal model of airborne SAR moving target echo is constructed firstly, which is a chirp signal naturally. According to this feature, a new technique of SAR moving target detection based on fractional Fourier transform is proposed. The effects of coupling in time-frequency domain on signal detection are eliminated. Compared with the bilinear time-frequency distribution algorithms, the fractional Fourier transform is a linear operator, and it will not affected by the intercross terms when multiple moving targets exist. The simulation results validate the effectiveness of this technique. |
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| Keywords: | Fractional Fourier transform Synthetic Aperture Radar (SAR) Moving target detection |
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