电离层时空变化对中高轨SAR成像质量的影响分析

发布时间：2018-06-26 13:28

本文选题：中高轨SAR + 电离层　；参考：《电子与信息学报》2014年04期

【摘要】：中高轨道合成孔径雷达(SAR)是下一代星载SAR重要的发展方向之一,电离层影响分析是推动中高轨道SAR系统发展的关键技术。该文针对中高轨道SAR的系统特点,结合电离层时空变化特征,建立了背景电离层对中高轨道SAR系统的影响分析模型,重点分析了背景电离层及其时空变化对中高轨SAR系统图像质量的影响,主要包括距离向和方位向图像分辨率的下降以及图像位移。分析结果表明,电离层及其时空变化对中高轨SAR图像质量产生较为严重的影响,相同电离层条件下,对于分辨率相同的SAR系统,随着轨道高度的增加,电离层引入的误差对距离向分辨率和图像畸变以及方位向分辨率和图像位移产生的影响程度将增大。
[Abstract]:The medium-high orbit synthetic aperture radar (SAR) is one of the important development directions of the next generation spaceborne SAR. Ionospheric impact analysis is the key technology to promote the development of the medium-high orbit SAR system. According to the system characteristics of medium-high orbit SAR and the temporal and spatial variation of ionosphere, an analysis model of the influence of background ionosphere on medium-high orbit SAR system is established in this paper. The influence of the background ionosphere and its temporal and spatial variations on the image quality of the medium-high orbit SAR system is analyzed, including the decrease of the image resolution in the range and azimuth directions and the image displacement. The results show that the ionosphere and its temporal and spatial variations have a serious effect on the quality of the SAR images in the medium-high orbit. For the SAR system with the same resolution and the same ionosphere, the orbital height increases with the increase of the orbital height. The influence of ionospheric errors on range resolution and image distortion and azimuth resolution and image displacement will increase.
【作者单位】：中国科学院电子学研究所;微波成像技术重点实验室;中国科学院大学;
【基金】：中国科学院科技创新重点部署项目国家部级基金资助课题
【分类号】：TN957.52

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