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1、60上海AERoSPACE航天SHANGHAI第34卷2017年第3期文章編號(hào):1006—1630(2017)03—0060—06基于雙星編隊(duì)SAR三軌法差分干涉技術(shù)的基線設(shè)計(jì)許麗穎,王海濤(上海衛(wèi)星工程研究所,上海201109)摘要:將單星重復(fù)軌道三軌法差分干涉擴(kuò)展到雙星編隊(duì),對(duì)正側(cè)視下合成孔徑雷達(dá)差分干涉(DInSAR)技術(shù)的基線設(shè)計(jì)進(jìn)行了研究。在測(cè)量坐標(biāo)系中,將位于主星距離高度平面內(nèi)的簡(jiǎn)化基線擴(kuò)展為空間矢量,根據(jù)空間幾何關(guān)系得到正側(cè)視下雙星編隊(duì)sAR三軌差分干涉法的空間基線模型。建立了編隊(duì)sAR測(cè)高程時(shí)基線設(shè)計(jì)公式,以及基線矢量到DInSAR測(cè)形變所需基線的轉(zhuǎn)換公式,基于該模型首次從應(yīng)
2、用角度分析了基線對(duì)編隊(duì)SAR三軌法差分干涉測(cè)形變的誤差傳播特性。給出了基于基線比的基線設(shè)計(jì)方法:測(cè)高程時(shí),基線選擇以臨界基線為上限,綜合考慮測(cè)高精度和靈敏度確定基線;測(cè)形變時(shí),為降低誤差對(duì)形變精度的影響,基線比應(yīng)盡量小(基線比為0.25時(shí)編隊(duì)sAR三軌法DInSAR形變測(cè)量精度最高),即地形圖像對(duì)的垂直有效基線應(yīng)盡量大,形變圖像對(duì)的基線應(yīng)盡量小。用AL0s一2衛(wèi)星參數(shù)進(jìn)行了仿真計(jì)算,所得編隊(duì)基線和重復(fù)軌道基線誤差要求分別為毫米級(jí)和厘米級(jí)。研究對(duì)DInSAR系統(tǒng)中基線參數(shù)設(shè)計(jì)有更直觀的理論指導(dǎo)意義和實(shí)際應(yīng)用價(jià)值。關(guān)鍵詞:雙星編隊(duì);合成孔徑雷達(dá)差分干涉;三軌法差分干涉;高程;形變;基線;誤差傳播
3、;形變精度中圖分類號(hào):TN958文獻(xiàn)標(biāo)志碼:ADoI:lo.19328/j.cnki.1006—1630.2017.03.008BaselineDesignofThree-TrackFormationBasedonSpaceborneSARDifferentialInterferometryXULi—ying,WANGHai—tao(ShanghaiInstituteofSatelliteEngineering,Shanghai201109,China)Abstract:Thebaselinedesignofdifferentialsyntheticapertureradarinterfer
4、ometry(DInSAR)wasstudiedforsidelookingwhilethethree—trackmethodforsinglesatellitewasextendedtobi—satelliteformationinthispaper.Throughextendingthesimplifiedbaselinescalarinheight—rangeplanetospatialvector,thespatialbaselinemodelofthree-tracksidelookingDInSARwasobtainedaccordingtothespatialgeometryi
5、nmeasurementcoordinatesystem.TheequationofbaselinedesignwasestablishedfordetectingelevationofformationSAR.AndthetransferequationofbaselinefrombaselinevectortoDInSARdeformationmeasurementwasalsogiven.Onthebasisofthismodel,forthefirsttimetheerrortransfercharacteristicsfromDInSARdeformationaccuracywas
6、analyzedatthepointofviewofapplication.Thebaselinedesignmethodbasedonbaselineratiowasputforward.Theupperlimitationofbaselinewasthecriticalbaselineforelevationdetection.Thebaselineshallbeselectedforconsideringelevationdetectionaccuracyandsensitivity.Andthebaselineratioshallbeassmallaspossibletoreduce
7、theinfluenceoferrorontheaccuracyfordeformationdetection.TheverticaleffectivebaselineofterrainimagepairshallbeaslongasIpossibleandthebaselineofdeformationimagepairshallbeassmallaspossible.Theaccuracyofdeform