HJ-1A/B星CCD相机在轨辐射性能检测分析

为检测分析HJ-1A/B星CCD相机在轨辐射探测性能及其辐射定标的有效性，提出了基于多种光学特性地面目标的在轨检测方法。首先，介绍了HJ-1A/B星CCD相机在轨辐射性能检测方法，并基于2013年HJ-1A/B卫星地面同步观测试验数据，获取了HJ-1A/B星过境时刻的卫星入瞳处等效辐亮度。然后以该等效辐亮度为基准，对HJ-1A/B星CCD相机历次在轨辐射定标结果进行检验，分析HJ-1A/B星CCD相机的在轨运行期间辐射探测性能变化趋势。结果表明：HJ-1A/B星在轨运行过程中，辐射性能在不断发生变化；在轨运行5年多时间里，HJ-1A/B星的CCD相机各波段的辐射性能平均衰变量最低为3.7%，最大为39.6%；为保证遥感数据的定量化精度，定期的在轨绝对辐射定标十分必要。

Validation and Analysis of In-Flight Radiation Properties of CCD Camera on HJ-1A/B Satellite

In order to analyze the radiation property changing and the validity of calibration for HJ-1A/B CCD cameras, a validation method based on multi-spectral reflectance field targets is developed. Firstly, the in-flight validation method for radiationproperties of HJ-1A/B CCD is introduced, and the equivalent radiance of HJ-1A/B CCD was calculated by using satellite-field synchronous measurements data in 2013. Then the radiometric calibration results of HJ-1A/B CCD are validated, and the trend of change of in-flight radiation properties of HJ-1A/B CCD is analyzed. The results show that the radiation properties of HJ-1A/B CCD change ceaselessly, and the attenuation of radiation properties of HJ-1A/B CCD is from 3.7% to 39.6% since launched, in-flight calibration for satellites is important to satisfy requirement of quantitative applications of remote sensing data.