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Remote Sensing Technology and Application  2016, Vol. 31 Issue (6): 1100-1106    DOI: 10.11873/j.issn.1004-0323.2016.6.1100
    
Effects of Wave Propagation on Repeat-pass Interferometric Performance of L\|band Geosynchronous Circular SAR
Kou Leilei1,Xiang Maosheng2
(1.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters
(CIC-FEMD)/Key Laboratory of Meteorological Disaster,Ministry of Education (KLME)/
Joint International Research Laboratory of Climate and Environment Change (ILCEC),
Nanjing University of Information Science & Technology,Nanjing 210044,China;
2.National Key Laboratory of Microwave Imaging Technology,Institute of Electronics,
Chinese Academy of Sciences,Beijing 100190,China)
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Abstract  

Unlike the conventional spaceborne SAR,the integration time of L\|band geosynchronous circular SAR (GEOCSAR) can be as long as 24 hours,the orbit altitude is about 36 000 km and the coverage may reach 1/3 of the Earth’s surface,the spatial and temporal variation of the trospheric refractivity and the ionospheric electron content may impose significant effects on repeat pass interferometric performance of GEOCSAR.Based on the spatial and temporal variation characteristics of the atmospheric medium,and the interferometic signal model,we analyze the effects of the trosphere and ionosphere on GEOCSAR interferometric performance.The effects from four aspects are mainly discussed including the phase delay caused by the troposphere and the ionosphere,the image shift on XY plane caused by the ionospheric horizontal gradient,focusing performance degradation caused by the diurnal variation of the trosphere and the ionospheric turbulence,and the Faraday rotation effect.The analysis and the simulation results show that the troposphere and ionosphere both impose very important influence on the GEOCSAR interferometric processing,the temporal variation of the ionospheric electron content during the synthetic aperture and the ionospheric turbulence may cause image defocused and then severely reduce the interferometric coherence.

Key words:  Geosynchronous circular SAR (GEOCSAR)      Trosphere      Ionosphere      Interferometric performance     
Received:  18 December 2015      Published:  30 December 2016
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Kou Leilei
Xiang Maosheng

Cite this article: 

Kou Leilei,Xiang Maosheng. Effects of Wave Propagation on Repeat-pass Interferometric Performance of L\|band Geosynchronous Circular SAR. Remote Sensing Technology and Application, 2016, 31(6): 1100-1106.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2016.6.1100     OR     http://www.rsta.ac.cn/EN/Y2016/V31/I6/1100

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