FY-2C星辐射定标及其结果分析

Radiometric Calibration of FY-2C Meteorological Satellite and Its Result Analysis

介绍了风云二号(FY-2)C星发射前后红外与水汽波段的地面真空辐射定标、星上黑体定标和地面辐射校正场定标,以及可见光波段的地面太阳定标、积分球定标、地面辐射校正场定标和太阳像的原理与方法。给出了C星不同波段不同定标法的结果。分析表明,C星采用的定标方法均有效,并互为补充和验证。为进一步提高定标精度,还可对环境温度模拟、二次曲线拟合、减小积分球定标误差和光谱响应等作相应的改进。

The principle and method of ground vacuum radiometric calibration, satellite-borne black body calibration, and calibration of the ground radiometric correcting field for infrared and water vapor channels of the scanning radiometer for FY-2C meteorological satellite were introduced in this paper, and so were the principle and methods of ground solar calibration, integral sphere calibration, calibration of the ground radiometric correcting field, and solar image. The calibration results for different channels gained by various methods were presented. The analysis showed that the calibration method adopted in C satellite was effective, which could be used as supplement and approval for each other. The improvements such as environment temperature simulation, second curve fitting, error decreasing of integral sphere calibration and spectrum response would be used to high calibration precision in future.