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TheFeasibilityofGPSforGezhouba

WeiweiLu0330506002Background

Thedatum-check-networkandlinear-triangulationnetworkofGezhoubawerepartsofthedamdistortionmonitoringsystembuiltupatearly80`swhentheGezhoubaProjectfinished.Themonitoringmethodstakeninthissystemhavemanydisadvantageousfactors,suchascockamamieobservationways,highstrengthwork,easilytobeinterferedbyweatherfactorandsoon.Especiallytheneedtocutdownalotoftreestomeettherequirementofobservation,destroyedthevirescenceofenvironment.Andthedisplacementofthecoordinateofdatum(Liaojiabao)resultinseveredistortionofdatum-check-networkadjustmentoutcome.SoitisnecessarytousetheadvancedGPStechniquetomodifythedatum-check-networkandlinear-triangulation-networksystem,dobetterservicetothesafetymonitoringofGezhouba.TheprinciplesofdesigningtheGPSnetHighaccuracyHighreliabilityLessworkloadLessexpenditureSurveyinginstrumentsthreeAstechZ12GPSreceiversModeofoperationRelativelystaticpositioning

TheGPSnetwillbemadeupofsynchronoustrianglesSurveyconfines

Recordinterim:20〞Elevationmask:15°

Mode:staticUsedsatellites:≥5PDOP≤4FlowoffieldoperationPreparetheinstruments,arrangethestaffsReconnaissanceDrawthedraftandthesurveyscheduleFieldsurveyDownloadthedataandcalculatethebaselinesEvaluatethequalityofthebaselinesolutionsNotcheckoutRecastthebaselinesEvaluatethequalityofthebaselinesolutionsEndStartNotcheckoutCheckoutCheckoutBaselinecalculationsUsethesoftware-WinprismIngeneral,whenthebaselinesolutions’RMS≤

1cmandRatio(ofthereliability)≥95%,thebaselinesolutionsarereliableRecastthesebaselineswhichdon’tcheckoutRemovethesebaselineswhichstilldon’tcheckoutFore-processthebaselinesolutionsUsethesoftware-CosaGPS2000(developedbyWuhanUniversity)Calculate

?theclosureerrorofthesynchronousloops

?theclosureerroroftheasynchronousloops

?theclosureerroroftheiterativebaselinesolutionsRemovethesebaselinesolutionswhichdon’tcheckoutTheadjustmentsoftheGPSnetUsethesoftware-CosaGPS2000Thethree-dimensionunconstrainedadjustmentThetwo-dimensionsimultaneousadjustment

Thethree-dimensionunconstrainedadjustmentAim

?thoroughlyinvestigatetheinternalaccuracyoftheGPSnet?detectthepossiblyexistinggrosserrorsConductthethree-dimensionunconstrainedadjustmentinWGS-84datumThetwo-dimensionsimultaneousadjustmentAim?furtherchecktheaccuracyandreliabilityoftheobservations

?comparetheresultswiththeprevioussurveyresultsConductthetwo-dimensionadjustmentassociatedwiththelocaldatum

Theadjustmentresultsreachtheaccuraciesrequiredby?Thesafetymonitoringstandardsforconcretedam?ConclusionsandproposalsSomeconclus

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