基于GPS的电离层监测研究.docx
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基于GPS的电离层监测研究.docx
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基于GPS的电离层监测研究
外文文献翻译
(含:
英文原文及中文译文)
文献出处:
GCrowley .GPSBasedIonosphericMonitoring[J].RadioScience,2013,1(10):
76-85.
英文原文
GPSBasedIonosphericMonitoring
GCrowley
Abstract
Basedoncurrentresearchneedsingeosciences,geophysics,spacephysics,andnavigation,andseveralimportantGPSresearchprojectsinengineeringapplications,wehavesystematicallystudiedhigh-precisionmodelingandcorrectionofionosphericdelaysinrecentyears.Thecontentofthisreportisapartialcontributionofourresearchwork.ItmainlydealswiththeresearchontheoriesandmethodsofGPS-basedionosphericmonitoringandhigh-precisioncorrectionofdelay:
howtocorrecttheionosphericdelayeffectofstaticanddynamicsingle-anddual-frequencyusers.,furtherimprovingtheaccuracyandreliabilityofGPSmeasurements;enhancedionosphericmodelingofGPSwide-areadifferentialsystemsandtheuseofGPStomonitortheionospheretheoryandmethods
Keywords:
GPSionosphericmonitoring,ionosphericdelay,GPSwide-areadifferential
Thisarticlemainlyincludestwoaspects:
I.Systematicsummaryandintroductionofthegeneraldescriptionoftheresearchbackgroundandrelatedbasicresearch
ItmainlydealswiththesignificanceofresearchonEarth'sionosphere,thecontentofEarth'sionosphericdetectiontechnologyandrelatedtheoreticalresearch,theorigin,severityandnewissuesofionosphericproblemsinmoderngeodesy,thebasiccharacteristicsofEarth'sionosphereanditseffectsonthepropagationofelectricwaves.ThebasictheoryandmethodsofGPSpositioning,theeffectofionosphericdelayonGPSmeasurements,thebasicmethodsofGPSionosphericdelaycorrection,thebasicprinciplesandmethodsofGPS-basedionosphericresearch,etc.ItthendiscussestheimportanceandentrypointforsolvingtheeffectsofGPS'sionosphericdelay.
Second,thesystemreportofthespecificresearchworkmainlyfocusesonthefollowingaspects:
1Studyhowtousetheobservationinformationofasingledual-frequencyGPSreceivertodeterminetheionosphericdelaycorrectionmodeltoserveasmallrangeofsingle-frequencyusers;
2StudyhowtoseparatetheinstrumentdeviationandionosphericdelayinGPSobservationsinrealtime;
3Studyhowtoestablishalargeareaoftheionosphericgridmodel,andtheninitiallyimaginetheuseofChina'scrustalmovementobservationnetworktofurtherstudytheionosphericelectronconcentrationchangesinChina'sfield;
4Studyhowsingle-frequencyuserscanmakebetteruseofionosphericdelaycorrectioninformationunderadverseconditions.5StudybasictheoriesandframeworkschemesformonitoringrandomionosphericdisturbancesusingGPS;
6StudyhowtocomprehensivelyconsiderthechangesoftheionosphereonSundays,seasonsandyears,andfurtherimprovetheabilitytouseGPStosimulateionosphericdelay;
7Researchonhowtoachieveionosphericdelaycorrectionrequirementsintheprecisionorbitmeasurementofsatellite-borneGPSlow-orbitsatellites.
1.(local)High-precisionextractionofionosphericdelays
ThesystemdiscussesandanalyzesvariousfactorsthataffecttheuseofGPSobservationstoaccuratelyextractionosphericdelayinformation.Throughin-depthresearchontherelevantmodelsandmethods,theaccuracyofusingGPStoextractionosphericdelayinformationhasbeenfurtherimproved.mainlyinclude:
(1)Theparameter-fixedtrigonometricseriesionosphericmodelisextendedtoamoregeneralizedformofparametersthatismoresuitablefortheoreticalresearchandpracticalapplication.Itisrealizedthatdifferentcharacteristicparametersareselectedtosimulateionizationaccordingtothecharacteristicsofspatio-temporalchangesofionospheredelay.Layerdelayeffects.Thetrialresultsshowthatitcanbetterreflecttheionosphericactivitycharacteristicsandimprovethelocalionospheredelaysimulationcapability.ItissuitableforDGPSsystemstocorrecttheionosphericdelayofsinglefrequencyGPSusersintheirservicearea.
(2)Severaldifferentcalculationschemeshavebeendesignedtoanalyzethecharacteristicsofinstrumentaldeviationsindeterminingtheeffectofionosphericdelay.Studieshaveshownthattheeffectofinstrumentaldeviationsonthesolutionofionosphericdelaysismuchgreaterthantheeffectofobservationalnoise,resultinginsystematicerrorsofuptoafewmetersfordelayedobservationsoftheionosphere.WhenusingtheGPSobservationdatatosolvetheionosphericmodelordirectlycalculatetheslantrangeionosphericdelay,wemusthandletheinstrumentdeviationwithcaution,andweshouldnotsimplytreatitasnoise.
(3)Usingthephasesmoothingcodedatatofurtherrefinetheinstrumentdeviationseparationmethodandexplorethestabilityofinstrumentdeviation.Thestudyfoundthatthenewmethodcaneffectivelyovercometheinfluenceofnoiseonthedeviationoftheseparationinstrument,andtheinstrumentdeviationisrelativelystableandcaneffectivelyperforminter-rangeandinter-dayforecasting.
(4)Basedontheideaofreal-timeaveragedenoisingandweightedjointprocessingofcodeandphaseobservationdata,anewschemeforreal-timeseparationofinstrumentdeviationandsolutionofionosphericdelayisproposed.Examplesshowthatthenewmethodusestheaveragede-noisingseparationmethodtopost-processthephase-smoothingdata,findtheinstrumentaldeviations,andcorrecttheobservationsthatrequirereal-timeprocessingoftheinstrumentaldeviations,anddirectlyusetheobservationstodeterminetheionosphericdelays.Thesmallnumberofestimatedparameterscaneliminatemostoftheeffectsofinstrumentaldeviationsandhasagoodaccuracy.ItcanbeusedasaviablereferencefordeterminingionosphericdelaysinWAASandotherGPSnetworks.
2.ANewApproachtoBuildingLargeScale(RegionalandGlobal)High-precisionGridIonosphericModels
-Inter-regionalzoninganditsinitialimplementationinChina
Aftersystematicallystudyingtheprinciplesandmethodsofgridionospheremodeling,inordertoavoidtheeffectofthegeometricalstructureofthereferencestationnetworkontheestimationofthemodelaccuracy,thelocalcharacteristicsoftheionosphericdelayeffectsarefullytakenintoaccounttofurtherimprovetheionosphericmodelofthegrid.Theconstructionaccuracyofthenewgridgridionospheremodelisproposed.Basedontheabovestudies,theaccuracyofthegridionospheremodelwasestimatedusingthereferencenetworkofthecrustalmovementobservationnetwork.Thewide-areadifferentialGPSenhancementsystemtobeestablishedinChinawaspreliminarilyexplored,andtheionospherewasprovidedusingthegridionosphericmodel.Correctthefeasibilityoftheinformationandissuesforfurtherstudy.
3.IonosphericdelaycorrectionsforWAASsinglefrequencyGPSusersinadverseconditions
NewApproach-APR-ISolution
Innormalconditionsandcalmionosphericregions,WAAScanmeettheionosphericdelaycorrectionrequirementsofsingle-frequencyusers,butwhentheusercannotnormallyobtainionosphericdelaycorrectioninformation,suchasinthedifferentialsystemsuddenlyinterruptedmessagetransmissionortheuserstepintothenormalreceptionUndertheunfavorableconditionssuchasthelocationofdifferentialcorrectioninformation,single-frequencyGPSreceiverscannoteffectivelyperformreal-timeionosphericdelaycorrection.Inparticular,underconditionswhereionosphericactivityisabnormal,suchasionosphericdisturbance,thereal-timedifferentialcorrectioneffectwillbeseriouslyaffected.TheseproblemsaredifficulttoavoidandmustbesolvedintheactualoperationofWAAS.Thepreviousresearchresultsareallpost-processingmethodsandcannotmeet(quasi)requirementsforreal-timeionosphericdisturbances.
Inresponsetothissituation,wehavedesignedamethodthatcaneffectivelycombineionosphericdelayabsoluteandrelativechangesintherecursiveprocess,andproposeamethodthatcaneffectivelycorrectsingle-frequencyGPSuserionosphericdelayintheabove-mentionedadverseconditions-APR-Iprogram.
1)TheoreticalbasisforconstructingAPR-Ischeme
WAAScanprovidehigh-precisionionosphericdelaycorrectioninformation(absoluteamount)undernormaloperationandnormalconditions,andthesingle-frequencyGPSreceiverintheareaservicedbyWAAScaneffectivelyprovideionosphericdelayvariation(relativeamount)underadverseconditions.),andwithoutconsideringtheinfluenceofnoise,anapproximatevalueoftheionosphericvariationbetweenanytwoobservationepochscanbedirectlycalculated.
2)ProposeAPR-Ischeme
Bydesigningarobustrecursiveprocessthatcaneffectivelycombinetheabsoluteandrelativeamountofionosphericdelay,anewsingle-frequencyGPSionosphericdelaycorrectionscheme(referredtoasAPRscheme,AbsolutePlusRelativeScheme)isstudied;APR-Iprogramaccuracyestimationformula;analysisoftheimplementationofAPR-Iprogrameffectiveways.
Studieshaveshownthatthenewschemenotonlypreservestheprecisecorrectioneffectofdifferentialionosphericdelayinformationundernormalconditions,butalsoensurestheionosphericdelaycorrectioneffectofsingle-frequencyGPSusersunderadverseconditions.TheimplementationoftheAPR-IprogramdoesnotneedtochangetheoriginaldesignconceptofWAAS.Therearenonewrequirementsforthehardware.Onlyaslightimprovementoftheuser'sGPSsoftwareisrequired,andtheimplementationissimple.ItisacceptableandeasyforbothWAASandsingle-frequencyGPSusers.Realized.
4.ANewTheoryforDetectingRandomSignals--ProposedbyEstimatingSampleSelf-CovarianceEstimation
AnditsapplicationinGPSmonitoringofrand
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