高精度星载SAR多普勒参数估算方法

文竹; 周荫清; 陈杰

高精度星载SAR多普勒参数估算方法

北京航空航天大学电子信息工程学院, 北京 100083

详细信息

中图分类号: TN 957.2
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出版历程
- 收稿日期: 2005-12-02
- 网络出版日期: 2006-12-31

Accurate method to calculate space-borne SAR Doppler parameters

School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 提出了一种基于空间坐标转换,利用卫星位置、速度参数精确估算星载SAR(Synthetic Aperture Radar)全观测带多普勒参数的方法.利用卫星速度、位置,通过星载SAR空间几何模型和坐标转换关系,建立SAR图像中斜距同卫星下视角之间的四次方程,解出下视角并进一步计算出该斜距处的多普勒参数值.仿真结果表明,该方法在无卫星位置、速度误差情况下估算精度达到0.02Hz(多普勒中心频率)和2×10^-4Hz/s(多普勒调频率);存在卫星位置测量误差(300m)以及速度测量误差(0.3m/s)的情况下,估算精度达到0.8Hz(多普勒中心频率)和0.07Hz/s(多普勒调频率).该方法适用于单星SAR以及分布式SAR高精度多普勒参数的估算.
- 合成孔径雷达 /
- 信号处理 /
- 雷达成像 /
- 参数估计
Abstract: A new method which can calculate the whole swath Doppler parameters of space-borne SAR(synthetic aperture radar) was presented. The method, based on space coordinate transformation, made the satellite position and velocity as references. Using the space geometric model and the coordinate transformation, a quartic equation between the slant range and the look angle was founded. After solving the equation, the look angle value was got, and the Doppler parameters were then calculated. The simulation results show that the calculation precision of the method can reach below 0.02Hz(Doppler centroid) and 2×10^-4Hz/s(Doppler rate) with no satellite position and velocity error. The precision can reach below 0.8Hz(Doppler centroid) and 0.07Hz/s(Doppler rate) even if there are measurement errors in satellite position (300m) and velocity (0.3m/s). This method is suitable for both single SAR and distributed SAR Doppler parameters precision calculations.
- synthetic aperture radar /
- signal processing /
- radar imaging /
- parameter estimate

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参考文献(1)

[1] 刘纪元,李春升,周荫清.星载SAR信号处理的多普勒中心频率估计方法[J]. 北京航空航天大学学报,1992,18(2):11-15 Liu Jiyuan, Li Chunsheng, Zhou Yinqing. Doppler centroid estimation for spaceborne SAR signal processing[J]. Journal of Beijing University of Aeronautics and Astronautics, 1992, 18(2): 11-15(in Chinese) [2] 魏忠铨,陈元藻,戎志鹏,等. 合成孔径雷达卫星[M].北京:科学出版社, 2001:175 Wei Zhongquan, Chen Yuanzao, Rong Zhipeng, et al. Synthetic aperture radar satellite[M]. Beijing:Science Press, 2001:175(in Chinese) [3] Madsen S N. Estimating the Doppler centroid of SAR data[J]. IEEE Transactions Aerospace and Electronic Systems, 1989,AES-25(2):134-140 [4] Blacknell D, Blake A P, Oliver C J, et al. A comparison of SAR multilook registration and contrast optimisation autofocus algorithms applied to real SAR data Processing of International Conference Radar 92. Brighton, UK:IEE,1992:363-366 [5] Curlander J C, McDonough R N. Synthetic aperture radar, systems and signal processing[M]. New York:Wiley, 1991:588-591 [6] 《数学手册》编写组. 数学手册[M]. 北京:高等教育出版社,1997:89-90 "Mathematics Manual" Edit Group. Mathematics muanual[M]. Beijing:High Education Press, 1997:89-90(in Chinese)

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