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研究,进一步分析了PS点相位与时间及空间二维向量的关系,研究表明PS点差分干涉相位与干涉像对的时间基线,空间垂直基线(相对于公共主图像)呈线性关系,与时间的比例斜率为PS点相对线性形变速率的常数倍,与空间垂直基线的比例斜率为各PS点对应的高程修正值,在此分析基础上建立了PS点干涉相位二维线性回归分析模型,与此同时对残余相位进行了分析.在PS候选点提取方面,不再基于单一的统计分析方法,将波谱差异法与强度稳定性法相结合,在对试验区构造环境及影响因素进行分析的基础上,对PS候选点提取中关键参数进行最优选择,利用二维线性回归分析模型对PS干涉相位进行分析,通过两次回归分析逐步计算出PS点高程修正值及相对线性形变速率,对差分干涉图进行修正,最终得到试验区时间序列形变图.基于试验区形变图像对PS点位移特性进行分析,对区域形变特征及形变规律进行讨论,对PSInSAR技术理论及应用再次进行总结.
研究表明盆地西北部念青唐古拉山处于上升阶段,沿卫星视线方向相对位移速率约3mm/a,盆地内部处于沉降阶段,由北向南运动幅度具有一定差异,靠近盆地南部山前地带沉降速率比较大,沿卫星视线方向相对位移速率约3～4mm/a.随着PS点在盆地内部分布向西北推移,其位移形式逐渐复杂,受青藏高原特有季节性冻融因素影响,许多PS点位移随季节表现出一定的往复式位移方式,但总体位移趋势沿卫星方向呈负向运动.
关 键 词:PSInSAR波谱差异后向散射强度二维线性回归分析时间序列形变图
ResearchonApplicationofPSInSARTechnology
onMovementMonitoringofActiveFault
JiangWenliang
ABSTRACT
Thepermanentscatterersapproach(PSInSAR),whichisbasedonconventionalInSARtechnique,putemphasisonprocessingtimeseriesofSARinterferogramsbyrecognizingandanalyzingsinglescattererswithastablebackscatterintensityorreliablephasebehaviorintime,tostudythedeformationhistoriesoftheearth'ssurfaceinalongtimeseries.ComparedwiththeconventionalInSARtechnology,thePSapproachcanbetterconquerproblemsoftemporalandspatialdecorrelation,alsotheatmosphericdelayeffect,whichwillimprovetheefficiencyofdatumutilization,tomeasurelargetimescaledeformationaffair.However,therearestillsomeproblemshamperthesuccessfulapplicationofPSapproach,whichareidentificationofreliablepointtargets,three-dimensionalanalysisofPSinterferometricphase.Atpresent,thesuccessfulapplicationofPSapproachismainlylimitedtogroundsurfacesedimentationofurbanareaordiggings,whereabundanceofnaturalpermanentscattererscanbeidentified.Bycontrary,fewernaturalpointtargetswillberecognizedinDamxiongarea,whichisselectedasthetestareaofthepaper,forlackofhumanbuildingandstructure,onlynakedrocksareidentifiedaspermanentscatterercandidate.ThepaperwillputemphasisonthestudyofsomekeyaspectsofPStechnology,applyingthePSapproachonactivefault,todetectthemicro-movementofearthsurfaceamongseismicdiapausesinducedbyactivefault.
ThelimitedfactorsofconventionalInSARareanalyzedinpaper,whicharetemporaldecorretaion,spatialdecorrelationandatmosphericdelay.Thebasicprinciple,advantageandstatusareintroduced.
Methodsofpointtargets'identificationareinvestigated,includingcoherence,spectraldiversity,phaseandbackscatterintensity.Moreover,newcriterionsarepensatoryformethodofbackscatterintensity.Identificationofmanualcornerreflectorisresearchedbasedonthesemethods.Selectionofmonmasterimageisstudiessubsequently.
ThephasemodelofconventionInSARareputedandanalyzed,especiallythetemporalandspatialbehaviorofit.Furthermore,relationsofunwrappedinterferometricphasewithtwodimensionswhichcorrespondingtotheperpendicularbaselineandtimedifferenceareanalyzed,whichindicatesalineardependenceofphaseonthetwoterms.Therelatedslopesofthemcorrespondtorelativeterrainheightcorrectionandrelativelineardeformationrates.Onbaseofthistheory,amodeloftwo-dimensionallinearregressionanalysisisestablishedforPSinterferometricphase.Residualphasesarestudiesatlast,whichisposedofnon-lineardeformationphase,atmosphericdelayphaseandphasenoise.
Methodsofspectraldiversityandstableintensityarebinedtoidentifypointtargetscandidate.Thisisquitedifferentformformerstudies,forwhichsinglemethodisusedonly.Afteranalysisofgeologicalstructureandinfluencingtermsoftestarea,theoptimalparametersareselectedandbinedforPSCselection.InterferometricphaseofPSCareanalyzedusingtwo-dimensionallinearregressionanalysismodel.Mapsofdeformationhistoriesareobtainedafterdifferentialprocessing.Characteristicsoftypicalpointtargetsareanalyzed,includingdeformationhistories,influencingterms.Characteristicsanddisciplinesoftestareadeformationarediscussed.KeypointsofPSInSARtechniquearesummarizedagain.
Researchindicates,NyainqêntanglhaRangeinnorthwestofDamxiongbasinraiseatarelativerateof3mm/aalongthelineofsightofsatellite,atthesametime,theDamxiongbasindescendsinacertaindegree,butthedescendingratesisafewdifferentfromthesouthtothenorth.Insoutheastofbasin,thepermanentscatterersdescendatarelativerateofabout3-4mm/aalongthelineofsightofsatellite.Affectedbytermoffrozenearth,thedisplacementofpermanentscatterersinthenorthofDamxiongbasinarenotobvious,butbehaveadescendenttrendasawhole.
Keywords:PSInSAR,Spectraldiversity,Backscatterintensity,Two-dimensionallinearregressionanalysis,Damxiongbasin,Deformationoftimeseries.
论文中英文摘 要
作者姓名:张彬
论文题目:近年来几次强震在中国南北地震带动态应力触发问题研究
作者简介::张,男,年月出生,年月师从于教授,于年月获士学位.8.0地震对甘肃景泰5.8地震和缅甸6.5地震的触发作用,2003年中,俄,蒙交界7.9地震对甘肃民乐-山丹6.1地震和岷县5.2地震的触发作用以及2004年苏门答腊8.7地震对云南双柏5.1地震和思茅
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