Improvement of Gaofen-3 Absolute Positioning Accuracy Based on Cross-Calibration
AbstractThe 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
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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.
Deng M, Zhang G, Zhao R, Li S, Li J. Improvement of Gaofen-3 Absolute Positioning Accuracy Based on Cross-Calibration. Sensors. 2017; 17(12):2903.Chicago/Turabian Style
Deng, Mingjun; Zhang, Guo; Zhao, Ruishan; Li, Shaoning; Li, Jiansong. 2017. "Improvement of Gaofen-3 Absolute Positioning Accuracy Based on Cross-Calibration." Sensors 17, no. 12: 2903.
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