
红外与激光工程
InfraredandLaserEngineering
2015年1月
Jan.2015
高分一号卫星PMS相机多场地宽动态辐射定标
韩启金,张学文,乔志远,杨磊,潘志强,刘李
(中国资源卫星应用中心,北京100094)
摘
要:为克服卫星遥感器常规定标方法不足,实现GF-1卫星PMS相机高精度在轨定标,提出了
多场地宽动态辐射定标方法,分析了新方法的不确定度。首先,介绍宽动态辐射定标原理和试验场区概况,设计开展了GF-1卫星多场地同步观测试验;接着,基于试验数据和宽动态定标模型,实现了GF-1卫星PMS相机的在轨辐射定标;最后,讨论GF-1卫星PMS相机多场地定标的不确定度和模型的稳定性。结果表明:GF-1卫星PMS相机自发射以来辐射响应特性与实验室定标结果相比发生了一定变化,最大变化量达到了7.72%;PMS相机多场地辐射定标的综合不确定度为5.35%。所获取的PMS相机定标系数满足遥感辐亮度产品生产的精度要求,且多场地定标可作为后续高分卫星的在轨定标的方法参考。
关键词:高分一号卫星;PMS相机;试验场;辐射定标;不确定度中图分类号:TP722.4;TP721.1;TP731
文献标志码:A
文章编号:1007-2276(2015)01-0127-07
WidedynamicradiometriccalibrationofGF-1PMSsensors
usingmulti-testsites
HanQijin,ZhangXuewen,QiaoZhiyuan,YangLei,PanZhiqiang,LiuLi
(ChinaCenterforResourcesSatelliteDataandApplication,Beijing100094,China)
Abstract:Inordertoovercomethelimitationsofconventionalcalibrationmethodandrealizehighprecisionin-flightradiometriccalibrationofGF-1PMSsensors,anewwidedynamicradiometriccalibrationmethodusingmulti-testsiteswaspresented,andtheuncertaintyofthismethodwasyzed.Firstly,thewidedynamicradiometriccalibrationtheorywasintroducedandthecharacteristicsoftestsiteswasdescribed.Besides,theGF-1satellitetofieldsynchronousobservingcampaignwithmultitestsiteswasdesigned.Secondly,basedonmeasureddataandwidedynamiccalibrationmodel,thecalibrationofPMSsensorswasfinished.Finally,theuncertaintyandfeasibilityofthiscalibrationalgorithmicwerediscussed.TheradiometricpropertiesofGF-1PMSsensorshavechangedcomparingwiththeprelaunchlaboratorycalibratedresults,andthebiggestchangeiscloseto7.72%.AndtheuncertaintyofwidedynamicradiometriccalibrationofPMSsensorsbasedonmulti-testsitesis5.35%.Theobtainedprecisionofcalibrationcoefficientsmeetstherequirementsofremotesensingradiance′sretrieval,andthemethodprovidesareferenceforfurthercalibrationofhighresolutionsatellite.Keywords:GF-1satellite;
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