| 一种基于机载SAR原始回波的多普勒参数估计方法 |
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| 引用本文： | 郭微光,梁甸农,董臻,刘光平.一种基于机载SAR原始回波的多普勒参数估计方法[J].国防科技大学学报,2003,25(3):41-44. |
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| 作者姓名： | 郭微光 梁甸农 董臻 刘光平 |
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| 作者单位： | 国防科技大学电子科学与工程学院,湖南,长沙,410073 |
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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项目(51431020101KG01) |
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| 摘 要： | 多普勒参数的估计精度直接影响机载合成孔径雷达系统(SAR)成像质量。根据平均后的方位谱来估计多普勒中心频率,通过计算子图像之间的位移值来估计多普勒调频斜率。为了消除在实际应用中各种干扰的影响,采用了对原始回波数据加窗的方法来提高对估计的准确性。该算法的估计结果可以用于补偿载机运动误差引入的相位误差,从而实现高分辨率成像。通过使用实验数据进行分析,验证了该方法的有效性。
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| 关 键 词： | 机载合成孔径雷达 多普勒中心频率 多普勒调频斜率 |
| 文章编号： | 1001-2486(2003)03-0041-04 |
| 收稿时间： | 2003/1/10 0:00:00 |
| 修稿时间： | 2003年1月10日 |
Doppler Parameters Estimation from Raw Data of an Airborne SAR |
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| GUO Weiguang,LIANG Diannong,DONG Zhen and LIU Guangping.Doppler Parameters Estimation from Raw Data of an Airborne SAR[J].Journal of National University of Defense Technology,2003,25(3):41-44. |
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| Authors: | GUO Weiguang LIANG Diannong DONG Zhen and LIU Guangping |
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| Institution: | College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China;College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China;College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China;College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China |
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| Abstract: | In the airborne synthetic aperture radar system, the estimation accuracy of Doppler parameters affects the image quality directly. This paper estimates Doppler centroid using the averaged azimuth spectrum, and it estimates the Doppler frequency rate by computing the shift between sub-images. The raw data are windowed to reduce the affection of various noises in the system, and improve the estimation accuracy. Results of the algorithm can be used to compensate the phase error caused by motion error of the airborne. The method is finally verified with a set of actual experimental data. |
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| Keywords: | airborne synthetic aperture radar Doppler centroid Doppler frequency rate |
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