夜光遥感卫星带外光谱响应校正研究

Correction of Out-Band Spectral Response of Night Light Remote Sensing Satellite

通过建立"吉林一号"夜光遥感相机光谱响应模型,分析了出现带外光谱响应的原因,提出了夜光遥感卫星带外光谱响应校正的方法。根据遥感相机各谱段间光谱响应的关系,通过对不同光谱特性的标准光源进行计算得到带外响应校正系数,然后对夜光遥感图像目标光源的带外光谱响应进行校正,并通过在轨实验完成目标光源辐亮度反演。校正后的夜光遥感卫星辐亮度差异得到了明显的降低,平均辐亮度差异由10.53%降低至4.88%,且各谱段辐亮度差异均低于7%。

This paper built a spectral response model of the "Jilin-1" night light remote sensing camera to analyze the reasons of the out-band spectral response and proposed a method for the out-band spectral response correction of the night light remote sensing satellite. According to the relationship between the spectral response of the remote sensing camera in each band, the out-band response correction coefficient is obtained by calculating the standard light sources with different spectral characteristics. The out-band spectral response of the target light source in the night light remote sensing images is corrected, and the radiance of the target light source is inversed through on-orbit experiments. The corrected radiance difference of the night light remote sensing satellite is significantly reduced, with an average decreasing from 10.53% to 4.88%, and the radiance difference in each band is less than 7%.