GNSS基準點選擇對監(jiān)測結(jié)果的影響分析摘要GNSS是現(xiàn)代化導(dǎo)航系統(tǒng)的代表，其在地理信息、地球物理、航空航天、地質(zhì)災(zāi)害監(jiān)測等領(lǐng)域得到了廣泛的應(yīng)用。GNSS監(jiān)測必須依賴于確定的基準點，選擇不同的基準點可能會對監(jiān)測結(jié)果產(chǎn)生影響。本文通過系統(tǒng)的文獻綜述和數(shù)值模擬，探討了基準點的選擇對GNSS監(jiān)測結(jié)果的影響。關(guān)鍵詞：GNSS；基準點選擇；監(jiān)測結(jié)果；影響分析AbstractGNSSisarepresentativeofmodernnavigationsystems,whichhasbeenwidelyusedinthefieldsofgeographicinformation,geophysics,aerospace,geologicalhazardmonitoring,etc.GNSSmonitoringmustrelyondeterminedreferencepoints,andselectingdifferentreferencepointsmayaffectthemonitoringresults.Inthispaper,throughsystematicliteraturereviewandnumericalsimulation,theselectionofreferencepointsanditsimpactonGNSSmonitoringresultsareexplored.Keywords:GNSS;referencepointselection;monitoringresults;impactanalysisIntroductionGNSSisanadvancedanduniversalpositioningsystembasedonspacetechnology,whichcanprovidecontinuousandaccuratethree-dimensionalpositioningandvelocityinformation.Itplaysanimportantroleinavarietyoffieldssuchasnavigation,surveying,mapping,andmonitoring.GNSSmonitoringistheprocessofusingtheGNSStechnologytomonitorthedynamicchangesoftheearth'ssurface,includingdeformation,subsidence,anddisplacement.Thistechnologyhassignificantapplicationprospectsinthefieldsofearthquakeprediction,landsubsidencemonitoring,landslidemonitoring,andsoon.TheaccuracyofGNSSmonitoringresultsiscloselyrelatedtotheselectionofreferencepoints.Referencepointsarethebenchmarkpointsthatarestableovertimeandcanprovideaccurateandreliablepositioninginformation.Therefore,thechoiceofreferencepointsiscriticalforGNSSmonitoring.MethodologyInthisstudy,weusedtwomethodstoexploretheimpactofreferencepointselectiononGNSSmonitoringresults.Firstly,throughliteraturereview,wesummarizedandanalyzedtheresearchontheselectionofGNSSreferencepointsinrecentyears,andsortedoutthefactorsthatshouldbeconsideredintheselectionofreferencepoints,includingrockstability,siteaccessibility,landformsandtopography,andpositionaccuracy.Secondly,weusednumericalsimulationtoanalyzetheimpactofreferencepointselectiononGNSSmonitoringresults.Weselectedthreedifferentreferencepointsformonitoring,andsimulatedthedeformationoftheearth'ssurfacecausedbytectonicactivity.Wecomparedthedeviationofthemonitoringresultsunderdifferentreferencepoints.ResultsandDiscussionThroughliteraturereview,wefoundthatselectingstablegeodeticmonumentsisaneffectivewaytoobtainhigh-precisionandlong-termstableGNSSmonitoringresults.Theselectionofreferencepointsshouldalsoconsidertheenvironmentaroundthesite,suchasrockswithhighseismicactivityandgroundwithcomplexgeologicalstructure,whichmayaffectthestabilityofreferencepoints.Throughnumericalsimulation,wefoundthatdifferentreferencepointshavedifferenteffectsonGNSSmonitoringresults.Inoursimulation,ifwechooseareferencepointwithasolidrockfoundation,thedeviationofthemonitoringresultissmall,whichindicatesthatthestabilityofthereferencepointiscritical.Iftherockfoundationisunstable,themonitoringresultswilldeviatesignificantlyandcauseerrors.However,theinfluenceofsiteaccessibility,landformsandtopography,andpositionaccuracyonmonitoringresultsisnotobvious.ConclusionInsummary,theselectionofGNSSreferencepointsplaysacrucialroleinGNSSmonitoring.Throughliteraturereview,welearnedthatthestabilityofreferencepointsisthemostimportantfactortobeconsideredwhenselectingreferencepoints,andthattheenvironmentalconditionsaroundthesiteshouldalsobetakenintoaccount.Throughnumericalsimulations,wefoundthatthestabilityofreferencepointsgreatlyaffectstheaccuracyofmonitoringresults,whileaccessibility,landformsandtopography,andpositionaccuracyhavelittleimpact.Therefore,whenselectingreferencepointsforGNSSmonitoring,weshouldfocusonthe