Acta Optica Sinica, Volume. 35, Issue 7, 728003(2015)
On-Orbit Calibration and Evaluation of GF-2 Satellite Based on Wide Dynamic Ground Target
To validate the radiometric performance changing of GF-2 satellite, and obtain reliable on-orbit calibration coefficients of GF-2 sensors, an in-situ calibration methodology based on wide dynamic ground target is presented. Based on Dunhuang Gobi site, a test site including high, middle, and low reflective characteristics is re-selected and established. After that, the first on-orbit calibration for GF-2 is performed using the reflectance-based method and field measurement campaign. At last, the calibration coefficients changes and influence by comparing with prelaunch laboratory calibration results is discussed. The results indicate that: 1) the system offset of GF-2 itself is close to zero and relatively stable, while the radiometric responsivity has changed; 2) the calibration coefficients by using multi-site calibration method can better characterize on-orbit performance of GF-2 compared to the prelaunch lab calibration; the new calibration coefficients can be used for quantitative products retrieval and systems performance evaluation.
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Han Qijin, Ma Lingling, Liu Li, Zhang Xuewen, Fu Qiaoyan, Pan Zhiqiang, Wang Aichun. On-Orbit Calibration and Evaluation of GF-2 Satellite Based on Wide Dynamic Ground Target[J]. Acta Optica Sinica, 2015, 35(7): 728003
Category: Remote Sensing and Sensors
Received: Dec. 26, 2014
Accepted: --
Published Online: Jun. 26, 2015
The Author Email: Qijin Han (cresda_hanjin@126.com)