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1、第39卷第5期测绘学报Vol.39,No.52010年10月ActaGeodaeticaetCartographicaSinicaOct.,2010文章编号:10011595(2010)05047806基于GPS双频原始观测值的精密单点定位算法及应用1,2111张宝成,欧吉坤,袁运斌,钟世明1.中国科学院测量与地球物理研究所,湖北武汉430077;2.中国科学院研究生院,北京100049PrecisePointPositioningAlgorithmBasedonOriginalDualfr
2、equencyGPSCodeandCarrierphaseObservationsandItsApplicationZHANGBaocheng1,2,OUJikun1,YUANYunbin1,ZHONGShiming11.InstituteofGeodesyandGeophysics,ChineseAcademyofSciences,Wuhan430077,China;2.GraduateUniversityofChineseAcademyofSciences,Beijing100049,ChinaAbstra
3、ct:Aprecisepointpositioning(PPP)algorithmbasedonoriginaldualfrequencyGPScodeandphaseobservationsispresented.InsteadofformingtheionospherefreecodeandphaseobservationsasusuallydoneforstandardPPPalgorithm,bytakingthedispersivepropertyofionosphereintoaccount,th
4、efirstorderionosphericdelayeffectsofL1frequencyalongsatellitereceiverlineofsight(LOS)areincorporatedintothestatevectorwhichisestimatedbyextendedKalmanfilter(EKF)technique.Thisalternativealgorithmcouldavoidtheadverseeffectofamplifiedmultipathandmeasurement
5、errorsexistingintheionospherefreeobservations,Inthemeantime,severalconstraintscanbeintroducedtotheLOSionosphericdelayparametersduringthefilteringprocess,toimprovetheconvergenceofthefiltertomorereliableandprecisesolutions.TheLOSionosphericdelayscouldbeobtaine
6、dsimultaneouslywithotherunknownparameters,whichwouldfacilitatetheresearchonionosphereatasinglesite.Besides,therecursiveDIAprocedureisadoptedasqualitycontrolstrategytoguaranteethereliabilityoftheestimatorsfromtheproposedPPPimplementations.Theperformanceofprop
7、osedalgorithmisevaluatedfordifferentpositioningapplications:static,lowdynamicandhighdynamictest,andapositioningaccuracyofabout1~2cmand7~8cmcanbeachievedrespectivelyforstaticandkinematicpositioning.Theconvergencebehaviorandrepeatabilityoffilteredsolutionscan
8、bewellimprovedbycomparingthepositioningperformanceofproposedandstandardPPPimplementationsforlowdynamictest.Keywords:precisepointpositioning(PPP);GPSdualfrequencyobservations;extendedKal
