RADIOMETRIC CALIBRATION ON ORBIT FOR FY-2B METEOROLOGICAL SATELLITE' S VISIBLE CHANNELS WITH THE RADIOMETRIC CALIBRATION SITE OF DUNHUANG

Rong Zhiguo; Zhang Yuxiang; Qiu Kangmu; Hu Xiuqing; Zhang Lijun

Vol.15, NO.3, 2004

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(3): 266-272

Rong Zhiguo, Zhang Yuxiang, Qiu Kangmu, et al. Radiometric calibration on orbit for FY-2B meteorological satellite' s visible channels with the radiometric calibration site of Dunhuang. J Appl Meteor Sci, 2004, 15(3): 266-272.

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RADIOMETRIC CALIBRATION ON ORBIT FOR FY-2B METEOROLOGICAL SATELLITE' S VISIBLE CHANNELS WITH THE RADIOMETRIC CALIBRATION SITE OF DUNHUANG

National Satellite Meteorology Center, Beijing 100081

Received Date: 2003-01-12
Rev Recd Date: 2003-07-09
Publish Date: 2004-06-30

Abstract

Abstract

Pre-launch calibration of the FY-2B's visible channels has much error due to the influence of stray light. The radiometric calibration on orbit for FY-2B's visible channels might be running with the radiometric calibration site of Dunhuang's Gobi. There are must calibrated the BRDF of bi-direction characteristic of Dunhuang's site, because the zenith is close to 50°. The reflectance of the Gobi, light extinction of atmosphere and radiosonde observation were measured in synchronization for FY-2B in July 2002, while the bi-direction characteristics of the site were measured. The data processed results indicate that the calibration precision are debased 20% due to influence of stray light for FY-2B's visible channels, and the output of FY-2B's visible channels is very stabilization after long stakeout. The calibration tables calibrated by the site of four visible channels were listed.
- FY-2B;
- Stray light;
- Radiometric calibration on orbit;
- Visible channel;
- BRDF;

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References(6)

Figures and Tables

图 1 FY-2B可见光通道光谱响应函数

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图 2 FY-2B扫描辐射计 (9902) 可见光通道 (主、备8个探测器) 云南天文台定标结果图

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图 3 辐射计主放大器放大后输出与反照率的关系图

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图 4 敦煌场地2002年测量的地面反射比

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图 5 敦煌双向反射比

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图 6 2002年7月18日FY-2B在轨电定标阶梯

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图 7 2002年7月18日FY-2B可见光通道外场定标曲线

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表 1 FY-2B可见光通道主放大器放大倍数及14级增益系数

表 2 FY-2B扫描时刻大气参数

表 3 2002年7月18日定标查找表 (计数值与对应的各通道反射率)

表 4 可见-近红外通道场地定标误差分布

表 5 2002年7月18、20日定标查找表

References

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