Journal
SENSORS
Volume 17, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/s17122903
Keywords
Gaofen-3; geometric accuracy; cross-calibration
Funding
- Ministry of science and technology [2016YFB0500801]
- National Natural Science Foundation of China [91538106, 41501503, 41601490, 41501383]
- China Postdoctoral Science Foundation [2015M582276]
- Hubei Provincial Natural Science Foundation of China [2015CFB330]
- Open Research Fund of State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing [15E02]
- State Key Laboratory of Geo-information Engineering [SKLGIE2015-Z-3-1]
- Fundamental Research Funds for the Central University [2042016kf0163]
- Key Laboratory of Satellite Mapping Technology and Application, National Administration of Surveying, Mapping and Geoinformation [KLSMTA-201707]
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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.
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