扁率摄动对地球同步轨道SAR成像聚焦的影响分析

胡文龙

doi:10.12000/JR15121

扁率摄动对地球同步轨道SAR成像聚焦的影响分析

doi: 10.12000/JR15121

胡文龙^,

1.
(中国科学院电子学研究所北京 100190)
2.
(中国科学院空间数据处理与应用系统技术重点实验室北京 100190)

基金项目:

国家部委基金

详细信息

作者简介:
胡文龙(1963-),男,籍贯安徽,北京航空航天大学博士学位,中国科学院电子学研究所研究员。主要研究方向为雷达信号处理、雷达目标识别、高轨SAR新体制新方法等。E-mail:wlhu@mail.ie.ac.cn

通讯作者:
胡文龙wlhu@mail.ie.ac.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2015-11-16
- 修回日期: 2016-03-31
- 网络出版日期: 2016-06-28

Impact of Earth's Oblateness Perturbations on Geosynchronous SAR Data Focusing

Hu Wenlong^,

1.
(Institute of Electronics, Chinese Academy of Sicences, Beijing 100190, China)
2.
(Key Laboratory of Technology in GeoSpatial Information Processing and Application System, Chinese Academy of Sicences, Beijing 100190, China)

Funds:

The National Ministries Foundation

摘要

摘要: 针对地球同步轨道星载合成孔径雷达(Geosynchronous Synthetic Aperture Radar, GEOSAR)长合成孔径成像受地球扁率摄动影响的问题,推导了卫星不同轨道根数受摄动所导致的雷达回波多普勒调频率和2次相位公式,通过分析扁率摄动对成像的影响,得到结论:地球扁率摄动使雷达回波产生附加的2次相位调制,相位调制的主导成分是卫星轨道长半轴受摄分量,相位调制幅度与成像所采用的轨道弧段有关,2次相位调制总量经过分钟量级的长合成孔径累积几乎在卫星运动全周期超过45的容限。雷达成像聚焦不能简单忽略扁率摄动的影响,必须采取相应的补偿措施,否则会造成图像散焦。
- 地球同步轨道SAR /
- 轨道摄动 /
- SAR成像
Abstract: In this study, we focus on the ultra-long integration of orbital perturbations of geosynchronous Synthetic Aperture Radar (SAR) for imaging. By deriving mathematical expressions for the Doppler rate and quadratic phase from orbital elements perturbated by oblateness or the J2 term of the non-spherical gravitational force of the Earth, we analyze the impact on SAR data focusing. Based on our results, we conclude that the quadratic phase will exceed 45, which is the defocusing threshold for imaging, after accumulation during a long integration time at the minute level. Because the potential for defocusing exists throughout nearly the entire satellite motion cycle, the SAR processor must carefully manage and compensate for the quadratic phase to avoid image degradations.
- Geosynchronous SAR (GEOSAR) /
- Orbital perturbation /
- SAR imaging

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参考文献(24)

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