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时间:2020-05-20
《高分辨率空间相机实时偏流调整的误差分析及地面验证-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第9期仪器仪表学报Vol_35No.92014年9月ChineseJournalofScientificInstrumentSep.2014高分辨率空间相机实时偏流调整的误差分析及地面验证术王栋,闫得杰,吴伟平,孙天宇(中国科学院长春光学精密机械与物理研究所长春130033)摘要:为实现高分辨率空间相机长时间连续对地观测要求,分析了在轨主要影响像质的因素之一偏流角的形成原因,提出了在高分辨相机上加装偏流机构,在拍摄过程中实时调整偏流角的策略。列举了影响偏流调整精度的各项误差,重点对机构调整
2、附加误差进行分析,建立附加误差计算模型,给出了机构调整速度和调整误差的关系图。通过对某实际系统进行误差分配,当偏流调整速度不超过14/s,机构附加误差不超过3时,可满足96级TDICCD连续长时间成像要求,传递函数下降全程不超过5%。为验证调整策略的正确性,采用动态目标发生器模拟相机与地面相对运动,搭建了实时偏流调整地面闭环测试系统,完成了偏流角恒速变化和变速变化时实时偏流调整的实验验证。通过地面试验验证,实时偏流调整均能很好地完成对模拟靶标的跟随,在连续4min拍摄中动态图像始终清晰,引起传函下
3、降不超过0.008,充分证明了空间相机实时偏流调整的有效性和可行性。关键词:空间相机;偏流角调整;误差分析;实时;地面验证中图分类号:TH39V445.8文献标识码:A国家标准学科分类代码:590.99Erroranalysisandgroundverificationofhighresolutionspacecamerareal-timedriftangleadjustmentWangDong,YanDejie,WuWeiping,SunTianyu(ChangchunInstituteofOp
4、tics,FineMechanicsandPhysics,ChineseAcademyofSciences,Changchun130033,China)Abstract:Inordertomeettherequirementsoflongtimecontinuousearthobservationwithhighresolutionspacecamera,theformationreasonforoneofthemainfactorsafectingtheimagequalityonorbit,t
5、hedriftangle,isanalyzed.Astrategyisproposed,whichaddsthedriftangleadjustmentmechanismonhighresolutioncameraandadjuststhedriftangleinrealtimeintheimagingprocess.Theerrorsaffectingdriftangleadjustingprecisionarelisted.Theanalysisfocalizesontheadditional
6、elTOl~ofmechanismadjustment.Anadditionale/Totcalculationmodelisbuilt.Therelationgraphbetweenmechanismadjustingspeedandadjustingerorisprovided.Intheerrorbudgetofacertainrealsystem,whenthedriftangleadjustingspeedislessthan14/sandtheadditionalerrorisnoto
7、ver3,thelongtermcontinuousimagingrequirementof96-scaleTDICCDismet.andtheMTFdeclinationislessthan5%.Toverifythecorrectnessoftheadjustingstrategy,aclosed-loopgroundtestsystemfortherealtimedriftangleadjustmentwasestablishedusingadynamictargetgeneratortos
8、imulatetherelativemotionbetweenthespacecameraandtarget;theexperimentverificationoftherealtimedriftanglead-justingwasconductedundertheconditionthatthedriftanglevariesatconstantspeedandvariablespeed.Duringthegroundexperimentverification,therealt
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