卫星多光谱扫描仪模拟空间环境辐射定标技术

Radiometric calibration of satellite multi-spectral scanner under space simulation conditions

模拟空间环境辐射定标技术主要用于卫星发射前对其所携带的多光谱扫描仪的响应特性进行辐射定标,为用户提供定标曲线。介绍了利用多个光源、多套定标光学系统的多光谱扫描仪辐射定标技术。多谱段光源系统由太阳辐照积分球和黑体组成,积分球用于可见光、近红外谱段的辐射定标,黑体用于远红外谱段的辐射定标。多谱段定标光学系统通过在真空低温环境下的精密传动机构切换反射镜位置,以离轴抛物面反射镜为中心形成两套光学系统,分别将积分球、黑体的辐射反射到扫描仪的入口,从而一次试验即可完成卫星多光谱扫描仪全谱段的辐射定标。

The technology of radiometric calibration under space simulation conditions is used for calibration test of satellite prelaunch multi-spectral scanner. Multi-spectral sources and multi-spectral optical system is described. The multi-spectral sources include a solar integrating sphere and a blackbody, the solar integrating sphere covers the spectrum of visible light and near infrared, and the blackbody covers the spectrum of far infrared. The multi-spectral optical system can be switched by precision gearing to make two optical systems which reflect the light individually from integrating sphere and blackbody to reach the scanner. Therefore it can perform radiometric calibration under space simulation conditions for multi-spectral scanner by only one test.