| 摘要: |
| 地球同步轨道合成孔径雷达（Geosynchronous Earth Orbit SAR，GEO SAR）是近几年来SAR领域的研究热点。GEO SAR轨道高度达到35786km，作用距离远、覆盖范围大，使得传统低轨星载SAR的回波仿真方法不再适用，例如双程斜距计算方法、姿态导引方法、地面目标布设方法等都需要改进。回波仿真是SAR成像处理的一个重要环节，在吸收现有研究成果的基础上，提出了一种改进的GEO SAR回波仿真方法，考虑了不同的轨道构型，在椭球地球表面布设点阵目标，更符合实际情况。通过回波仿真和成像验证了所提方法的有效性。 |
| 关键词: 同步轨道合成孔径雷达 回波仿真 双程斜距 曲面目标 文森特公式 |
| DOI：DOI:10.3969/j.issn.1672-2337.2019.02.013 |
| 分类号:TN957 |
| 基金项目: |
|
| An Improved Echo Simulation Method of GEO SAR |
|
WANG Bingqian, QI Xiangyang, ZHOU Binbin
|
|
1.Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
|
| Abstract: |
| Geosynchronous synthetic aperture radar (GEO SAR) is a research focus in the field of SAR in recent years. The orbit height of GEO SAR reaches 35786km with long operating distance and wide coverage, making the echo simulation method of traditional low earth orbit SAR no longer applicable. For example, the two-way range calculation method, the attitude steering method, and the layout method of ground target need improving. Based on the existing research results, an improved echo simulation method of GEO SAR is proposed. This method considers GEO SAR with different orbital configurations, and it is more in line with the actual situation to develop a target scene model based on the ellipsoid earth surface. Finally, the effectiveness of this method is verified by echo simulation and imaging. |
| Key words: geosynchronous earth orbit SAR （GEO SAR） echo simulation two-way range surface scene Vincenty formula |
