期刊
REMOTE SENSING
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/rs9050464
关键词
spaceborne SAR; geometric calibration; atmospheric propagation delay; tropospheric delay; ionospheric delay
类别
资金
- Key research and development program of 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]
- Open Research Fund of State Key Laboratory of Geo-information Engineering [SKLGIE2015-Z-3-1]
- Fundamental Research Funds for the Central University [2042016kf0163]
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.
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