正交度对高精度二维转台测量精度的影响

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1、航天返回与遥感第38卷第3期94SPACECRAFTRECOVERY&REMOTESENSING2017年6月正交度对高精度二维转台测量精度的影响王建永张晨阳赵文峰崔世程（北京空间机电研究所，北京100094）摘要针对二维跟踪测量转台方位轴和俯仰轴正交度对角度测量精度的影响，基于球面三角计算方法和向量运算方法，文章分别推导获得转台不正交时角度测量误差的计算公式，分析上述公式获得正交度及其测量误差对转台测角精度的影响规律。结果表明，二维转台俯仰运动范围大于10°时，转台方位轴和俯仰轴正交度对方位测角精度影响较大，对俯仰测角精度影响可忽略不计；转台测角精度对正交度的测量误差非常敏感，俯仰角

2、为75°时，若正交度测量误差为3″，则方位角测量误差可达11.2″。基于此提出一种正交度分段拟合的修正方法可将正交度对测角精度的影响控制在4″以内。最后，针对性的介绍了转台旋转轴正交度的两种测量方法及其测量误差主要来源。研究结果对通用二维跟踪测量转台测角精度指标的合理分解具有一定的指导意义。关键词二维转台轴系正交度误差分析测量方法航天遥感中图分类号:V423.6文献标志码:A文章编号:1009-8518(2017)03-0094-08DOI:10.3969/j.issn.1009-8518.2017.03.011EffectsofOrthogonalityontheMeasuremen

3、tPrecisionofHigh-accuracyTwo-dimensionalTurntableWANGJianyongZHANGChenyangZHAOWenfengCUIShicheng（BeijingInstituteofSpaceMechanics&Electricity,Beijing100094,China）AbstractConsideringtheinfluenceoforthogonalitybetweenazimuthaxisandpitchaxisontheanglemeasuringprecisionoftwo-dimensionaltrackingturnt

4、able,theformulaofanglemeasuringerrorisderivedbasedonthesphericaltrianglemethodandvectormethodrespectively,whentheazimuthaxisandpitchaxisofturntableisnon-orthogonal.Theeffectsoftheorthogonalityanditsmeasuringerrorontheanglemeasuringprecisionareobtainedfromtheformula.Resultsshowsthatwhenthemotionr

5、angeoftheturntableiswiderthan10°,theorthogonalitybetweentheazimuthaxisandpitchaxishasgreateffectsonthemeasuringprecisionoftheazimuthangle,butlittleeffectsonthepitchangle.Furtherresultsshowsthattheanglemeasuringprecisionisquitesensitivetotheorthogonalitymeasuringerror.Whenthepitchingangleis75°and

6、theorthogonalitymeasuringerroris3″,theazimuthangleerrorcanreachto11.2″.Thenanorthogonalitysegmentedfittingmethodisproposed,whichcancontroltheanglemeasuringprecisionwithin4″.Finally,twokindsofrevolvingaxesorthogonalitymeasuringmethodsandtheirmainerrorsourcearesummarized.Theseresultshavesomeinstru

7、ctionalvaluefortheanalysisontheanglemeasuringprecisionofthegeneraltwo-dimensionaltrackingturntable.Keywordstwo-dimensionalturntable;axesorthogonality;erroranalysis;measuringmethod;spaceremotesensing收稿日期：2017-02-09基金项目：国家重大科技