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Sensors 2017, 17(9), 1977; https://doi.org/10.3390/s17091977

Geometric Calibration and Accuracy Verification of the GF-3 Satellite

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
*
Author to whom correspondence should be addressed.
Received: 3 August 2017 / Revised: 23 August 2017 / Accepted: 28 August 2017 / Published: 29 August 2017
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
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Abstract

The GF-3 satellite is the first multi-polarization synthetic aperture radar (SAR) imaging satellite in China, which operates in the C band with a resolution of 1 m. Although the SAR satellite system was geometrically calibrated during the in-orbit commissioning phase, there are still some system errors that affect its geometric positioning accuracy. In this study, these errors are classified into three categories: fixed system error, time-varying system error, and random error. Using a multimode hybrid geometric calibration of spaceborne SAR, and considering the atmospheric propagation delay, all system errors can be effectively corrected through high-precision ground control points and global atmospheric reference data. The geometric calibration experiments and accuracy evaluation for the GF-3 satellite are performed using ground control data from several regions. The experimental results show that the residual system errors of the GF-3 SAR satellite have been effectively eliminated, and the geometric positioning accuracy can be better than 3 m. View Full-Text
Keywords: SAR; GF-3 satellite; atmospheric propagation delay correction; geometric positioning accuracy; ground control points SAR; GF-3 satellite; atmospheric propagation delay correction; geometric positioning accuracy; ground control points
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhao, R.; Zhang, G.; Deng, M.; Xu, K.; Guo, F. Geometric Calibration and Accuracy Verification of the GF-3 Satellite. Sensors 2017, 17, 1977.

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