GNSS基准点选择对监测结果的影响分析

GNSS基准点选择对监测结果的影响分析摘要GNSS是现代化导航系统的代表，其在地理信息、地球物理、航空航天、地质灾害监测等领域得到了广泛的应用。GNSS监测必须依赖于确定的基准点，选择不同的基准点可能会对监测结果产生影响。本文通过系统的文献综述和数值模拟，探讨了基准点的选择对GNSS监测结果的影响。关键词：GNSS；基准点选择；监测结果；影响分析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