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Summary of Proposal MTH1827

TitleIonospheric Effects in Interferometric Synthetic Aperture Radar (InSAR) in different latitude Area
Investigator bo, hu - Chinese Academy of Sciences , Institute of Geodesy and Geophysics, State Key Laboratory of Geodesy and Earth
Team Member
Professor Liming, Jiang - Institute of Geodesy and Geophysics. Chinese Academy of Sciences , State Key Laboratory of Geodesy and Earth
Professor Qiang, Shen - Institute of Geodesy and Geophysics. Chinese Academy of Sciences , State Key Laboratory of Geodesy and Earth
Professor Hansheng, Wang - Institute of Geodesy and Geophysics. Chinese Academy of Sciences , State Key Laboratory of Geodesy and Earth
PH.D Lin, Liu - Institute of Geodesy and Geophysics. Chinese Academy of Sciences , State Key Laboratory of Geodesy and Earth
SummaryThis project will first time focus on quantitative analysis of ionospheric effects on X-band SAR system in different latitude area and develop the model to relate the ionospheric effect on InSAR and the TEC variation from GPS observation. How to study the high spatial resolution TEC variation with InSARís ionospheric measurement also will be studied in this project. In the past few years, the researches on InSAR mainly focus on the effects of atmosphere, orbit error and image procedure, and seldom concern on ionospheric effects, some time it is neglected or treated as a part of atmospheric effects. That is because the ionospheric effect of InSAR measurement is not obvious in mid-latitude area (generally below one centimeter). However, this effect becomes more and more significant in low-latitude and high-latitude areas with the increased wavelength of an electromagnetic wave. In addition, these ionospheric perturbations not only effect the phase measurement, but also result into azimuth positional offset. The appropriate model between the TEC variation and ionospheric effect will be built in Qinghai-Tibet Plateau. The precision and reliability of InSAR measurement will be improved after mitigation of ionospheric effects in Qinghai-Tibet Plateau area. Besides, the outcome of new research also can help us to invert the high spatial resolution of TEC variation and understand the structure of ionosphere. In this study, there are two key issues to be solved: 1) how to distinguish between the ionosphere's effects and atmospheric effect as they are all correlated in spatial domain; 2) how to build the optimal model between the ionospheric effect on InSAR and the TEC variation; Therefore, the project to be developed represents has both significant scientific and practical values. The deliverables of this project may include several peer-reviewer journal papers, several presentations in the international conference, and some algorithms which infer the ionospheric effects on InSAR measurement. The study is also funded by the National Science Foundations of China.

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