| 摘要: |
| 大椭圆轨道SAR（Highly-Elliptic Earth Orbital SAR）作为低轨SAR（LEOSAR）、中高轨SAR（MEOSAR、HEOSAR）的结合，具有观测范围广、时间分辨率高的特点，是非常具有应用前景的新型SAR系统。本文根据大椭圆轨道SAR的系统特点及优势，对大椭圆轨道SAR系统设计中的成像体制选择、工作参数选择、成像模式设计等进行了论述。针对大椭圆轨道SAR系统存在的特殊问题，对大椭圆轨道SAR的关键技术问题进行分析，提出了针对上升/下降时段、远地时段观测特点的高精度成像算法，并对大椭圆轨道SAR天线和空间环境适应性设计难点进行了总结。这些研究结果为大椭圆轨道SAR系统实现及应用提供有益参考。 |
| 关键词: 大椭圆轨道SAR 系统设计 成像算法 空间环境适应性 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.04.004 |
| 分类号:TN958 |
| 基金项目:国家科技部国际合作专项（No.2015DFA10270） |
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| Investigation on Highly-Elliptic Earth Orbital SAR System Design and Key Techniques |
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YAO Baidong， SHENG Lei， SUN Guangcai， TAN Lulu， WU Hao， ZHOU Zicheng， WANG Yan
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1. The 38th Research Institute of China Electronics Technology Group Corporation， Hefei 230088， China;2. National Key Lab of Radar Signal Processing，Xidian University， Xi’an 710071， China
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| Abstract: |
| Highly-elliptic earth orbital SAR is a very promising spaceborne SAR system for earth observation，which is a combination of LEOSAR，MEOSAR and HEOSAR for its powerful and flexible observation capability. Concepts and system design considerations of highly-elliptic earth orbital SAR are investigated and some technology challenges are discussed in this paper. The imaging algorithms for ascending/descending and apogee period are also proposed. Moreover，the difficulties of antenna design and space environment adaptability are discussed. The investigation can provide useful reference for the highly-elliptic earth orbital SAR system design and applications. |
| Key words: highly-elliptic orbital earth SAR system design imaging algorithm space environment adaptability |
