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Sensors 2017, 17(12), 2903;

Improvement of Gaofen-3 Absolute Positioning Accuracy Based on Cross-Calibration

School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
School of Geomatics, Liaoning Technical University, Fuxin 123000, China
Author to whom correspondence should be addressed.
Received: 29 October 2017 / Revised: 9 December 2017 / Accepted: 11 December 2017 / Published: 14 December 2017
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
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The Chinese Gaofen-3 (GF-3) mission was launched in August 2016, equipped with a full polarimetric synthetic aperture radar (SAR) sensor in the C-band, with a resolution of up to 1 m. The absolute positioning accuracy of GF-3 is of great importance, and in-orbit geometric calibration is a key technology for improving absolute positioning accuracy. Conventional geometric calibration is used to accurately calibrate the geometric calibration parameters of the image (internal delay and azimuth shifts) using high-precision ground control data, which are highly dependent on the control data of the calibration field, but it remains costly and labor-intensive to monitor changes in GF-3’s geometric calibration parameters. Based on the positioning consistency constraint of the conjugate points, this study presents a geometric cross-calibration method for the rapid and accurate calibration of GF-3. The proposed method can accurately calibrate geometric calibration parameters without using corner reflectors and high-precision digital elevation models, thus improving absolute positioning accuracy of the GF-3 image. GF-3 images from multiple regions were collected to verify the absolute positioning accuracy after cross-calibration. The results show that this method can achieve a calibration accuracy as high as that achieved by the conventional field calibration method. View Full-Text
Keywords: Gaofen-3; geometric accuracy; cross-calibration Gaofen-3; geometric accuracy; cross-calibration

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Deng, M.; Zhang, G.; Zhao, R.; Li, S.; Li, J. Improvement of Gaofen-3 Absolute Positioning Accuracy Based on Cross-Calibration. Sensors 2017, 17, 2903.

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