Study on Ionospheric Effects Induced by Spatio-temporal Variability on Medium-earth-orbit SAR Imaging Quality
Li Liang①②③ Hong Jun①② Ming Feng①② Hu Ji-wei①②
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Sciences and Technology on Microwave Imaging Laboratory, Beijing 100190, China) ③(University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract：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.
李亮, 洪峻, 明峰, 胡继伟. 电离层时空变化对中高轨SAR成像质量的影响分析[J]. 电子与信息学报, 2014, 36(4): 915-922.
Li Liang, Hong Jun, Ming Feng, Hu Ji-Wei. Study on Ionospheric Effects Induced by Spatio-temporal Variability on Medium-earth-orbit SAR Imaging Quality. , 2014, 36(4): 915-922.
2014, Vol. 36 
