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Open AccessArticle

Ionospheric Phase Compensation for InSAR Measurements Based on the Faraday Rotation Inversion Method

1
Chinese Antarctic Center of Surveying and Mapping, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
2
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
3
School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(23), 6877; https://doi.org/10.3390/s20236877
Received: 1 October 2020 / Revised: 18 November 2020 / Accepted: 29 November 2020 / Published: 1 December 2020
(This article belongs to the Section Remote Sensors)
The ionospheric error can significantly affect the synthetic aperture radar (SAR) signals, particularly in the case of L band and lower frequency SAR systems. The ionospheric distortions are mixed with terrain and ground deformation signals, lowering the precision of the interferometric measurements. Moreover, it is often difficult to detect the small-scale ionospheric structure due to its rapid changes and may have more influence on ionospheric phase compensation for InSAR measurements. In this paper, we present a Faraday rotation (FR) inversion method and corresponding procedure to compensate the ionospheric error for SAR interferograms and to detect the variations of small-scale ionospheric disturbances. This method retrieves the absolute total electron content (TEC) based on the FR estimation and corrects the ionospheric error for synthetic aperture radar interferometry (InSAR) measurements by transforming the differential TEC into the ionospheric phase. In two selected study cases, located in high latitude and equatorial regions where ionospheric disturbances occur frequently, we test the method using the Phased Array L-band Synthetic Aperture Radar (PALSAR) full-polarimetric SAR images. Our results show that the proposed procedure can effectively compensate the ionospheric phase. In order to validate the results, we present the results of ionospheric phase compensation based on the split-spectrum method as a comparison to the proposed method. To analyze the ability of our proposed method in detecting small-scale ionospheric disturbances, TEC derived from FR estimation are also compared with those derived from the global ionosphere maps (GIM). Our research provides a robust choice for the correction of ionospheric error in SAR interferograms. It also provides a powerful tool to measure small-scale ionospheric structure. View Full-Text
Keywords: radar interferometry; ionospheric distortion; Faraday rotation; compensation radar interferometry; ionospheric distortion; Faraday rotation; compensation
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MDPI and ACS Style

Li, B.; Wang, Z.; An, J.; Zhang, B.; Geng, H.; Ma, Y.; Li, M.; Qian, Y. Ionospheric Phase Compensation for InSAR Measurements Based on the Faraday Rotation Inversion Method. Sensors 2020, 20, 6877. https://doi.org/10.3390/s20236877

AMA Style

Li B, Wang Z, An J, Zhang B, Geng H, Ma Y, Li M, Qian Y. Ionospheric Phase Compensation for InSAR Measurements Based on the Faraday Rotation Inversion Method. Sensors. 2020; 20(23):6877. https://doi.org/10.3390/s20236877

Chicago/Turabian Style

Li, Bing; Wang, Zemin; An, Jiachun; Zhang, Baojun; Geng, Hong; Ma, Yuanyuan; Li, Mingci; Qian, Yide. 2020. "Ionospheric Phase Compensation for InSAR Measurements Based on the Faraday Rotation Inversion Method" Sensors 20, no. 23: 6877. https://doi.org/10.3390/s20236877

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