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Remote Sens. 2017, 9(5), 464; doi:10.3390/rs9050464

Multimode Hybrid Geometric Calibration of Spaceborne SAR Considering Atmospheric Propagation Delay

1
School of Geomatics, Liaoning Technical University, Fuxin 123000, China
2
State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
3
School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
4
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad Thenkabail
Received: 10 February 2017 / Revised: 4 May 2017 / Accepted: 7 May 2017 / Published: 10 May 2017
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Abstract

The atmospheric propagation delay of radar signals is a systematic error that occurs in the atmospheric environment, and is a key issue in the high-precision geometric calibration of spaceborne SAR. A multimode hybrid geometric calibration method for spaceborne SAR that considers the atmospheric propagation delay is proposed in this paper. Error sources that affect the accuracy of the geometric calibration were systematically analyzed. Based on correction of the atmospheric propagation delay, a geometric calibration model for spaceborne SAR was established. The high precision geometric calibration scheme for spaceborne SAR was explored by considering the pulse-width and bandwidth of the signal. A series of experiments were carried out based on high-resolution Yaogan 13 (YG-13) SAR satellite data and ground control data. The experimental results demonstrated that the proposed method is effective. The plane positioning accuracy of YG-13 in stripmap mode without control points is better than 3 m, and the accuracy of the sliding spotlight mode is better than 1.5 m. View Full-Text
Keywords: spaceborne SAR; geometric calibration; atmospheric propagation delay; tropospheric delay; ionospheric delay spaceborne SAR; geometric calibration; atmospheric propagation delay; tropospheric delay; ionospheric delay
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Zhao, R.; Zhang, G.; Deng, M.; Yang, F.; Chen, Z.; Zheng, Y. Multimode Hybrid Geometric Calibration of Spaceborne SAR Considering Atmospheric Propagation Delay. Remote Sens. 2017, 9, 464.

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