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Article

Interferometric Phase Error Analysis and Compensation in GNSS-InSAR: A Case Study of Structural Monitoring

by 1,2, 1,2,*, 1,2 and 1,2
1
School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
2
Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Mehrez Zribi
Remote Sens. 2021, 13(15), 3041; https://0-doi-org.brum.beds.ac.uk/10.3390/rs13153041
Received: 18 June 2021 / Revised: 29 July 2021 / Accepted: 30 July 2021 / Published: 3 August 2021
Global navigation satellite system (GNSS)-based synthetic aperture radar interferometry (InSAR) employs GNSS satellites as transmitters of opportunity and a fixed receiver with two channels, i.e., direct wave and echo, on the ground. The repeat-pass concept is adopted in GNSS-based InSAR to retrieve the deformation of the target area, and it has inherited advantages from the GNSS system, such as a short repeat-pass period and multi-angle retrieval. However, several interferometric phase errors, such as inter-channel and atmospheric errors, are introduced into GNSS-based InSAR, which seriously decreases the accuracy of the retrieved deformation. In this paper, a deformation retrieval algorithm is presented to assess the compensation of the interferometric phase errors in GNSS-based InSAR. Firstly, the topological phase error was eliminated based on accurate digital elevation model (DEM) information from a light detection and ranging (lidar) system. Secondly, the inter-channel phase error was compensated, using direct wave in the echo channel, i.e., a back lobe signal. Finally, by modeling the atmospheric phase, the residual atmospheric phase error was compensated for. This is the first realization of the deformation detection of urban scenes using a GNSS-based system, and the results suggest the effectiveness of the phase error compensation algorithm. View Full-Text
Keywords: GNSS-based InSAR; interferometric phase error; deformation retrieval GNSS-based InSAR; interferometric phase error; deformation retrieval
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MDPI and ACS Style

Wang, Z.; Liu, F.; Zeng, T.; Wang, C. Interferometric Phase Error Analysis and Compensation in GNSS-InSAR: A Case Study of Structural Monitoring. Remote Sens. 2021, 13, 3041. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13153041

AMA Style

Wang Z, Liu F, Zeng T, Wang C. Interferometric Phase Error Analysis and Compensation in GNSS-InSAR: A Case Study of Structural Monitoring. Remote Sensing. 2021; 13(15):3041. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13153041

Chicago/Turabian Style

Wang, Zhanze, Feifeng Liu, Tao Zeng, and Chenghao Wang. 2021. "Interferometric Phase Error Analysis and Compensation in GNSS-InSAR: A Case Study of Structural Monitoring" Remote Sensing 13, no. 15: 3041. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13153041

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