“资源三号”卫星多光谱相机在轨辐射性能变化监测

In-orbit Radiometric Performance Change Monitoring of ZY-3 MUX Camera

为更好的开展遥感数据定量化应用并分析监测载荷在轨期间的性能变化,文章根据"资源三号"(ZY-3)卫星发射以来的在轨场地观测数据,基于场地定标的反射率基法,计算多光谱(MUX)相机2012~2016年的场地定标系数,并提出利用离散系数评价MUX相机辐射性能变化的方法;对ZY-3卫星MUX相机在中国辐射校正场获取的共10次同步试验数据进行了分析,结果显示自2012年发射以来MUX相机辐射特性的衰变在5%左右。

For better quantitative application of remote sensing data and changes monitoring of the radiometric performance for in-orbit payload,this paper analyses the calibration coefficients since the launch of ZY-3 in 2012.The coefficients of variation is calculated to evaluatethe radiometric characteristics changes of MUX.Totally,10 synchronous in situ measurements are used for the calculation of ZY-3 MUX based on the reflectancebased method.The results show that the decay of radiometric performanceis around 5% since ZY-3＇s launch.