CAJ | 학술논문

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。
중고궤도합성공경뢰체(SAR)시하일대성재SAR중요적발전방향지일，전리층영향분석시추동중고궤도SAR계통발전적관건기술。해문침대중고궤도SAR적계통특점，결합전리층시공변화특정，건립료배경전리층대중고궤도 SAR 계통적영향분석모형，중점분석료배경전리층급기시공변화대중고궤 SAR 계통도상질량적영향，주요포괄거리향화방위향도상분변솔적하강이급도상위이。분석결과표명，전리층급기시공변화대중고궤SAR도상질양산생교위엄중적영향，상동전리층조건하，대우분변솔상동적SAR계통，수착궤도고도적증가，전리층인입적오차대거리향분변솔화도상기변이급방위향분변솔화도상위이산생적영향정도장증대。
The Medium-Earth-Orbit SAR (MEOSAR) is one of the potential next-generation spaceborne SARs. Ionospheric effects analysis is one of the critical techniques for the development of MEOSAR. An analysis model for background ionospheric effect on MEOSAR is established based on the system characteristics of MEOSAR and the spatio-temporal variability of ionosphere. The degradation of image quality, including resolution and displacement distortion, induced by background ionosphere and its spatio-temporal variability is analyzed. The analysis result shows that ionosphere and its time-space variability affect critically the quality of obtained images. In condition of the same ionosphere, the degradation of resolution in both azimuth and range, the distortion on range image and the displacements in azimuth image are all more serious with the increasing of SAR orbit height when the resolution is same.