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1、第33卷2016年第3期上海AER()SPACE航天SHANGHAI文章編號(hào)：1006l630(2016)03一001106衛(wèi)星偏流角的矢量計(jì)算方法研究張大偉，溫淵，薛孝補(bǔ)，許瑩(上海衛(wèi)星工程研究所，上海200240)摘要：對(duì)一種近地圓軌道遙感衛(wèi)星偏流角的矢量計(jì)算方法進(jìn)行了研究?；诳紤]地球自轉(zhuǎn)時(shí)偏流角的定義和相關(guān)坐標(biāo)系，將計(jì)算偏流角用的速度矢量分解為數(shù)個(gè)速度的矢量和，由坐標(biāo)系轉(zhuǎn)換關(guān)系，根據(jù)衛(wèi)星地面物點(diǎn)定位信息確定其相對(duì)速度，推導(dǎo)出衛(wèi)星本體坐標(biāo)系中偏流角的計(jì)算公式。算法的基本運(yùn)算無(wú)需求導(dǎo)，可有效避免求導(dǎo)過(guò)程中牽連速度計(jì)算，具有模型準(zhǔn)確、計(jì)算
2、簡(jiǎn)便、結(jié)果精確、物理意義清晰、排查錯(cuò)誤容易等優(yōu)點(diǎn)。在不同三軸姿態(tài)角、載荷視物前向角和側(cè)向角條件下進(jìn)行了數(shù)學(xué)仿真計(jì)算，結(jié)果發(fā)現(xiàn)計(jì)算結(jié)果與偏流角定義相符，衛(wèi)星偏流角隨星下點(diǎn)地理緯度和緯度幅角的變化分別為封閉類圓和l／2周期的類正弦曲線，而視物前向角、側(cè)向角，滾動(dòng)角，俯仰角對(duì)偏流角的影響較小。該計(jì)算方法已用于高分五號(hào)(GF一5)衛(wèi)星的星上偏流角計(jì)算軟件。關(guān)鍵詞：遙感衛(wèi)星；高分辨率；地面物點(diǎn)；相對(duì)速度；偏流角；矢量算法；時(shí)間延遲積分電荷耦合器件(TDICCD)；牽連速度中圖分類號(hào)：V445．8文獻(xiàn)標(biāo)志碼：ADOI：10．19328／j．cnki．1
3、006—1630．2016．03．002StudyonaVectorAlgorithmofSatelliteDriftAngleZHANGDa—wei。WENYuan。XUEXiao—bu，XUYing(ShanghaiInstituteofSatelliteEngineering，Shanghai200240，China)Abstract：Avectoralgorithmofdriftangleforremote—sensingsatelliteonclosecircularorbitwasstudiedinthispaper．Theve
4、locityvectorusedincomputationofdriftanglewasdividedintovectoradditionofseveralvelocitiesbasedonthedriftangledefinitionwiththeconsiderationoftheearthspinandrelativecoordinatesystem．Therelativevelocityofobjectpointonthegroundwasdeterminedbythepositioninformationoftheobjectpo
5、intaccordingtOthecoordinatetransformation．Thecomputationformalofthedriftangleinthebodysystemofthesatellitewerederived．ThederivationwasnotneededintheessentialcalculationOfthealgorithmandthederivationcomputationofthetransportvelocitywasavoided，whichhadadvantagesthatthemodewa
6、saccurate，thecomputationwassimple，theresultwasexact，thephysicalmeaningwasclearandtheerrorfindingwaseasy．Thenumericalsimulationwasmadeunderthevariousattitude．forwardangleanddirectionfindingangle．Itwasshowedthatthecomputationresultwascoincidencewiththedefinitionofthedriftang
7、le．Thedriftangleswereclosedsimilarroundcurveandsimilarsinusoidalcurvewith1,／2cyclewhichwerechangingwiththelatitudeOfpointundersatelliteandargumentoflatituderespectively．Theinfluencesoftheforwardangle，lateralangle，rollangleandpitchangleonthedriftangleweresmall．Thealgorithmh
8、adbeenappliedinthesoftwareinGF一5satellite．Keywords：Remote—sensingsatellite；Highresolution
