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1、第37卷第5期航天返回與遙感2016年10月SPACECRAFTRECOVERY&REMOTESENSING111星載線陣遙感器在軌幾何外檢校技術(shù)研究周楠何紅艷（北京空間機(jī)電研究所，北京100094）摘要文章敘述了星載線陣遙感器的嚴(yán)格成像幾何模型，分析了姿態(tài)角誤差隨時(shí)間的變化情況，發(fā)現(xiàn)俯仰角誤差和滾動(dòng)角誤差隨時(shí)間變化的線性規(guī)律。在此基礎(chǔ)上，提出一種基于姿態(tài)角常差檢校模型同時(shí)顧及姿態(tài)角誤差隨時(shí)間變化的線性量的在軌幾何外檢校方法，檢校參數(shù)不僅由三個(gè)角元素誤差組成，同時(shí)包含俯仰角誤差和滾動(dòng)角誤差隨時(shí)間變化的線性量，并給出了相應(yīng)參
2、數(shù)求解方法。利用高精度控制數(shù)據(jù)和高分辨率衛(wèi)星影像驗(yàn)證了文章的模型和算法。試驗(yàn)結(jié)果表明，改進(jìn)后的外檢校試驗(yàn)結(jié)果優(yōu)于常差檢校模型，尤其是在線陣方向上的定位精度從17.9個(gè)像素提高到1.0個(gè)像素，這說(shuō)明了俯仰角誤差隨時(shí)間變化的線性量影響很大；在沿軌方向的定位精度從5.3個(gè)像素提高到3.7個(gè)像素，說(shuō)明滾動(dòng)角上的隨時(shí)間變化的線性量客觀存在，但是相對(duì)于俯仰角誤差隨時(shí)間變化的線性量影響不大。采用文章提出的在軌幾何外檢校方法，影像定位精度顯著提升。關(guān)鍵詞外檢校常差檢校線性量星載線陣遙感器中圖分類號(hào):P236文獻(xiàn)標(biāo)志碼:A文章編號(hào):1009
3、-8518(2016)05-0111-08DOI:10.3969/j.issn.1009-8518.2016.05.013ResearchofGeometricExteriorCalibrationofSpace-borneLinearArraySensorZHOUNanHEHongyan（BeijingInstituteofSpaceMechanics&Electricity,Beijing100094,China）AbstractThispaperbrieflydescribesimaginggeometricmode
4、lofspace-bornelineararraysensors,analyzesattitudeanglevariationwithtimeandfoundsoutalinearrulethatthepitchangleandrollangleerrorvariywithtime.Onthisbasis,anovelmethodofin-orbitgeometricexteriorcalibrationisproposedforgeome-tricexteriorcalibration,whichisbasedonthe
5、constantattitudeerrormodelandtakesintoaccounttheamountofattitudeerrorsoflinearchangewithtime.Also,acorrespondingparameterssolutionisgiven.Themodelandalgorithmofthisarticleareverifiedbyusinghigh-precisiongroundcontrolpointsandhigh-resolutionsatelliteimagery.Experim
6、entsindicatethattheimprovedexteriorcalibrationresultsarebetterthanthoseofthepreviousalgorithm.Especially,thepositioningaccuracyofthelineararraydirectionisimprovedfrom17.9pixelsto1.0pixel,whichshowsthattheeffectofthelinearamountofpitchangleerrorchangewithtimeissign
7、ificant.Thepositioningaccuracyoftheflightdirectionisimprovedfrom5.3pixelsto3.7pixels,whichshowsthattheli-nearamountofrollangleerrorchangewithtimeisobjectivereality,butithasalittleeffectwithrespecttothelinearamountofpitchangleerrorchangewithtime.Byusingtheproposedm
8、ethod,theimagepositioningac-curacywassignificantlyimproved.Keywordsexteriorcalibration;constantattitudeerror;linearamount;space-bornelineararraysensor收稿
