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1、遥感原理与应用考试问答题（ExaminationquestionsandanswersofremotesensingprinciplesandApplications）Three,questionsandanswers(40points)The1.networkprincipleofGPSnetwork(12points)Answer:forthebenefitofusers,thefollowingprinciplesshouldbefollowedingraphicdesignofGPSnetworks:(1)thelayou
2、toftheGPSnetworkshallbecarriedoutinaccordancewiththeprincipleofoptimumdesign,dependingonthepurpose,thesatellitestatus,theexpectedaccuracy,thereliabilityoftheresultsandtheefficiencyoftheoperation.(2)GPSnetsshouldnormallyformaclosedfigurethroughindependentobservationedg
3、es,suchasoneormoreindependentobservationrings,oranenclosedrouteformtoincreasetheinspectionconditionsandimprovethereliabilityofthenetwork.(3)betweentheGPSnetworkandisnotrequiredvisibility,butshouldbeconducivetotheapplicationaccordingtotheconventionalmeasurementmethodso
4、fencryptioncontrol.(4)thepossibleconditions,thenewlayoutofGPSnetworkshouldbecombinedwiththeexistingnearGPSpoint;thenewlayoutoftheGPSoutletsshouldbeconnectedwiththeoriginalgroundcontrolnetwork,theconnectionpointofthecoincidencepointsshouldnotbelessthanthree,anduniformd
5、istribution,soastoreliablydeterminetheconversionbetweenGPSnetworkandtheexistingnetworkparameter.(5)GPSoutlets,shouldusetheexistingstandardpointelevationsurvey.2.whatistherelativisticeffect?(8points)Answer:GPS20200kmsatelliteoperatinginhighorbit,thesatelliteclockisaffe
6、ctedbytheeffectontheeffectofgeneralrelativityandspecialrelativity,comparedtoitsfrequencyandgroundclockfrequencyoffsetwilloccur,thisisakindofprecisepositioningerrorfactorsmustbetakenintoaccount.Whatfactorsshouldbeconsideredinthedesignofthe3.GPStechnology?(10points)A:th
7、etechnicaldesignismainlybasedonthehigherauthoritiesissuedthemeasurementtaskbookandGPSmeasurementstandards.Itsgeneralprincipleistominimizetheconsumptionofmaterial,manpowerandtimetomeetuserrequirements.Intheprocessofwork,weshouldconsiderthefollowingfactors:(1)stationfac
8、tors;(2)satellitefactors;(3)instrumentalfactors;(4)logisticsfactors.4.howtoreducemultipatherror(10points)Answer:themultipath
