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| Citation: | Ding Chibiao, Liu Jiayin, Lei Bin, Qiu Xiaolan. Preliminary Exploration of Systematic Geolocation Accuracy of GF-3 SAR Satellite System[J]. Journal of Radars, 2017, 6(1): 11-16. doi: 10.12000/JR17024
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Preliminary Exploration of Systematic Geolocation Accuracy of GF-3 SAR Satellite System
doi: 10.12000/JR17024
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Abstract
GF-3, the first full-polarimetric Synthetic Aperture Radar (SAR) satellite of China with a resolution up to 1 m, was successfully launched in August 2016 and, after 5 months of in-orbit calibration, it was officially delivered to the users in January 2017. In this paper, the geometric positioning error sources of the entire system are analyzed based on the real data acquisition, including atmospheric transmission, image processing, and geometric positioning. The positioning precision of the SAR system is validated by corner reflectors. The results show that the satellite positioning accuracy improved by 3 m. -
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References
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- Figure 1. The range-Doppler model of spaceborne SAR
- Figure 2. The overlap position difference map of six hours per day of precise orbit
- Figure 3. The overlap velocity difference map of six hours per day of precise orbit
- Figure 4. The system time delay value of internal calibration with 20 MHz bandwidth and 45 μs pulse width
- Figure 5. The corner reflector and Timbel R5
- Figure 6. The place of corner reflectors
- Figure 7. The images of sliding spotlight mode of GF-3 satellite