摘要
在轨运行的传感器辐射性能由于受到元部件老化、外太空辐射等因素的影响会发生变化,通过传感器在轨定标可以对传感器的辐射性能进行监测。时间序列是衡量卫星传感器在轨运行期间辐射性能变化的重要依据。该研究通过交叉定标法对"高分一号"(GF1)卫星的多光谱宽视场成像仪(WFV)开展时间序列定标,采用MODIS作为参考卫星,计算GF1/WFV4相机2013-2018年间的定标系数,将定标系数同官方定标系数相比较,并用归一化法计算相对增益偏差。结果表明,GF1/WFV4相机的每个波段平均相对增益偏差分别为4.18%,4.87%,4.89%和4.46%,基于交叉定标方法获得的定标系数与官方公布的定标系数具有较好的一致性,可以实现对GF1卫星在轨期间辐射特性变化趋势的监测。
The radiation performance of the sensors operating in orbit will change due to the influence of components ′aging,outer space radiation and other factors,which can be monitored by in-orbit calibration of sensors. The time-series is an important basis for measuring the radioation performance changes of satellite sensors during their in-orbit operation. The timeseries calibration for the multispectral WFV(wide field of view)imager of the GF1(Gaofen-1)satellite is performed by means of the cross-calibration method. The MODIS is taken as the reference satellite when the calibration coefficients of the GF1/WFV4 camera from the year of 2013 to 2018 are calculated. The calculated calibration coefficients are compared with the official calibration coefficients,and the relative gain deviation is calculated by means of the normalization method. The results show that the average relative gain deviations of four wavebands of GF1/WFV4 camera are: 4.18%, 4.87%, 4.89% and 4.46%respectively. The calibration coefficient obtained based on the cross-calibration method is in good agreement with the official calibration coefficient,which can realize the monitoring of the variation trend of the radiation characteristics of the GF1 satellite during its in-orbit operation.
作者
邵雯
谢勇
宦海
田传阳
SHAO Wen;XIE Yong;HUAN Hai;TIAN Chuanyang(School of Electronic&Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Geography&Science,Nanjing University of Information Science and Technology,Nanjing 210044,China;Nanjing Research Center,National Engineering Laboratory for Remote Sensing Satellite Applications,Nanjing 210044,China)
出处
《现代电子技术》
北大核心
2020年第10期33-37,共5页
Modern Electronics Technique
基金
国家自然科学基金(41671345)
国家重点研发计划(2016YFB0502500)
广西创新驱动发展专项(桂科AA18118038)
南京信息工程大学人才启动基金(2243141601074)
国家民用空间基础设施项目:陆地观测卫星共性应用支撑平台。
关键词
时间序列定标
GF1
光谱相机
交叉定标
辐射性能监测
结果分析
time-series calibration
GF1
multispectral camera
cross calibration
radiation performance detection
result analysis
