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ID:46632311
大小:3.08 MB
页数:8页
时间:2019-11-26
《嫦娥三号动力落月段轨迹确定策略》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第33卷第3期2014年5月飞行器测控学报JournalofSpacecraftTT&CTechnologyV01.33No.3May2014引用格式:昌胜骐,黄勇,宋叶志,等.嫦娥三号动力落月段轨迹确定策略[J].飞行器测控学报,2014,33(3):236243.ChangShengqi,HuangYong,SongYezhi,eta1.OntrajectorydeterminationstrategyforsoftlandingofCE3onthemoonEJ].Jour—nalofSpacecraftTT&CTechnologv,2014,33(3):236243.嫦娥
2、三号动力落月段轨迹确定策略昌胜骐1‘2,黄勇1,宋叶志1,李培佳1,胡小工1(1.中国科学院上海天文台·上海·200030;2.中国科学院大学研究生院·北京·100049)摘要:针对CE3(嫦娥三号)月球探测器动力下降弧段,特别是悬停避障段频繁机动的特点,提出了采用B样条函数逼近方法进行落月轨迹确定。仿真分析表明:在动力下降运动较平滑弧段,B样条逼近法计算结果略优于多项式拟合法;而在频繁机动弧段,B样条逼近法有明显优势。计算结果表明,加入VLBI(VeryLongBaselineInterferometry,甚长基线干涉测量)数据后能有效提高落月轨迹确定精度,在没有系统误差的情
3、况下联合定位后位置精度优于50nl。此外,还分析了三向测量系统差对定位的影响,可对CE3任务提供参考。最后对CE3实测数据进行处理,动力落月段末点位置和着陆器定位计算值相差不到200m。关键词:落月轨迹;B样条函数;三向测量;软着陆;嫦娥三号(CE3)中图分类号:V412.41文献标志码:A文章编号:16745620(2014)03023608DOI:10.7642/j.issn.16745620.201403023608OnTrajectoryDeterminationStrategyforSoftLandingofCE一3ontheMoonCHANGShengqil⋯,HU
4、ANGYon91,SONGYezhil,LIPeijial,HUXiaogon91(1.ShanghaiAstronomicalObservatory,ChineseAcademyofSciences,Shanghai200030;2.GraduateSchool,ChineseAcademyofSciencesUniversity,Beijing100049)Abstract:AmethodbasedonBsplineapproximationisproposedfordeterminationofthelandingtrajectoryofCE3(Chang’e3)prob
5、eonthenloonbasedonthefeatureoffrequentmaneuversoftheprobeintheboosteddescendingarcand,particularly,duringthehoveringandobstacleavoidanceperiod.Simulationsho、=vsthatthemethodgivesahigherprecisionresultcomparedwiththemethodbasedonpolynomialfunctionfittingintherelativelysmootharcintheboosteddes
6、cendingperiodanditissignificantlybetterinthearcwithfrequentmaneuvers.ComputationresultsindicatethattheaddingofVLBI(VeryLongBaselineInterferometry)dataeffectivelyincreasestheaccuracyindeterminationofthemoonlandingtrajectory.Thepositionaccuracyisbetterthan50nlafterjointtrajectorydeterminationw
7、ithoutsystematicerror.Theimpactofthesystematicerrorofthreewaymeasurementontrajectorydeterminationisalsoanalyzed.Finally,themethodistestedwithdatafromtheCE3mission.Comparedwiththecomputedlocationofthelander,thepositionaccuracyattheendpointoftheboost
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