北斗简述Beidou briefly.docx

北斗简述Beidou briefly.docx

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北斗简述Beidoubriefly

北斗简述（Beidoubriefly）

北斗简述（Beidoubriefly）

Thenavigationsystem

Intheareaofsatellitenavigationtechnology,thecurrentU.S.GPSandEurope'sGalileosystemhave30satellites.Asdevelopedbyourcountryaglobalsatellitepositioningandcommunicationsystem,thebeidousatellitenavigationsystemistheU.S.globalpositioningsystem（GPS）andthethirdafterRussia'sGLONASSsatellitenavigationsystemofmaturity.Thesystemconsistsofthreeparts:

thespaceend,thegroundendandtheclient.Thespaceendincludesfivegeostationaryorbitsatellitesand30non-stationaryorbitingsatellites.NowChinahassent16navigationsatellitesandfourexperimentalsatellitesintospace,and40moresatelliteswillbeaddedtothesysteminthenext10years.TheclientconsistsofabeidouuserterminalandaterminalthatiscompatiblewithothersatellitenavigationsystemssuchasGPS,GLONASS,andtheEuropeanUnion,GALILEO.[1]

1.Coverage:

thebeidounavigationsystemisaregionalnavigationsystemcoveringChina.Rangeofabout70?

east

longitude140?

5?

55?

northlatitude.GPSisaglobalall-weathernavigationsystem.Toensurethatsixtoninesatellitescanbeobservedatanytimeandatanytimeonearth（infact,upto11）.

2,satelliteNumbersandorbitalcharacteristics:

beidounavigationsystemissetupontheearth'sequatorplane2geostationarysatellitesatelliteabout60?

Anglefromtheequator.GPSisin6set24satellitesorbitplaneorbit55?

inclinationoftheequator,orbitalplaneAngleof60?

the

equator.Thesatellitewillorbittheearthatanaverageof11hoursand58minutesaweek.

Locationprinciple:

thebeidounavigationsystemisanactive,two-waynavigation.Thegroundcentercontrolsystemissolvedfortheusertolocatethedatainthreedimensions.GPSisthepassivepseudo-code-directionalrange-based3dnavigation.The3dpositioningdataoftheuserisindependentlysolvedbytheuserdevice.Theprincipleof"beidou"numberonebringstwoproblems,oneistheusertolocatethelosttheconcealmentoftheradioatthesametime,itwillbeverybadonthemilitary,ontheotherhand,theequipmentmustincludethetransmitter,soonthesize,weight,priceandpoweratadisadvantage.

4.Positioningaccuracy:

the3dpositioningaccuracyofbeidounavigationsystemisaboutafewtensofmeters,andthetimingaccuracyisabout100ns.TheGPS3dpositioningaccuracyPcodeisnowincreasedfrom16mto6m,andC/Acodeisnowincreasedfrom25-100mto12m,whichisabout20nsbeforethetimeofinsemination.

5,usercapacity:

thebeidounavigationsystembecauseitistheactivetwo-wayranginginquiries-responsesystem,betweentheuserequipmentandgeostationarysatellitesnotonlyasksignalreceivinggroundcentercontrolsystem,alsorequiresauserequipmenttothesynchronoussatellitelaunchresponsesignal,sothattheuserofthesystemcapacitydependsonthechanneluserallowmodel.next,asksignalrateandfrequencyoftheuser'sresponse.Therefore,theuserdevicecapacityofthebeidounavigationsystemislimited.GPSisaone-waydistancemeasurementsystem,andtheuser'sequipmentcanbe

locatedbythenavigationsatellitesentbythenavigationsatellite,sothecapacityoftheuserdeviceofGPSisunlimited.

6,viability,andallthenavigationandpositioningsatellitesystems,"beidouno.1"basedoncentralizedcontrolsystemandsatellitework,butthe"beidouno.1"onthedependenceofthecentercontrolsystemaremuchbigger,

Becausethelocationsolutionisthereandit'snotdonebytheuserdevice.Inordertocompensateforthissystemvulnerability,GPSisdevelopingtheinterplanetarydatalinktechnologytoenableGPSsatellitestooperateindependentlyifthemaincontrolstationisdestroyed.The"beidouno.1"system,inadditiontothatpossibility,couldnotcontinuetoworkoncethecentralcontrolsystemwasdamaged.

7,real-time,"beidou"numberoneuserforbacktothecenterpositioningcontrolsystem,centercontrolsystemsolutiontocalculatethethree-dimensionalpositionoftheuserdataandthenbacktotheuser,whichpassesthroughwalkingbackandforthageostationarysatellite,plussatelliteforward,centercontrolsystem,theprocessingoftimedelayislonger,soforthemovementofbody,increasesthepositioningerror.

Inaddition,the"beidou1"satellitenavigationsystemhassomefeaturesofitsown:

1."beidou"hasadualroleoflocationandcommunication,andtheabilityofSMScommunicationisnotavailableinGPS.

2.Thepositioningaccuracyof"beidou"isonepointtwometers.

The"beidou"terminalcostsabout20,000yuan.

4.Nobasestationisrequiredtobeinstalledinthereceivingterminal.

Theshipofthedisastercentercansendoutinformationinasecond.

7correlation

AlthoughGPShasbeenwidelyused,it'snotperfect.

1.Itssizeandcostaretoohigh,anditisdifficultforothercountriestofollowsuit.TheRussianandEuropeanspacestationsaretypicalexamples.

2.GPScanonlybeusedasnavigationbutcan'trealizethecommunicationfunction,soitcannotmeetthegrowingdemandofusers.IfyourelyonGPSalone,youcaneasilybecontrolledbyothers."?

?

Satellitepositioningsystem,theapplicationbusinessinthisareahasjustbegun,andsometrialsofciviliantrialshavebeencarriedoutformorethanoneyear.

"Beidouno.1"andGPSdifferencemainlyliesintwoaspects,ontheonehandisthedifferencebetweenthetechnicalsystem,GPSpositioningsystemisareceivingtype,onlybroadcastsignals,theuserreceiveslocatedcando,isnotrestrictedbycapacity."Beidou1"isatwo-waystreetthathasbothlocation-basedandcommunicativesystems,butwithlimited

capacity,GPSisaSharedsystemofmilitaryandciviliancontrolbytheU.S.military,andisopentotheworld.TheGPSthatweChineseuseisasignalthatcanreceiveitforfree,buttheamericansdon'tpromisetoguaranteeyouruse,hedoesn'tchargeforit,buthedoesn'tpromisetoneverchargeforit.

TheGPSintheUnitedStatesthatyearhasjustbeenusedfarmorethanthe"beidouno.1"expensive,earlyinthelate1980sandearly'90swhenpeopleisusingGPSsystemthecheapestGPSreceiverwillbetensofthousandsofdollars,andexpensivetohundredsofthousandsofdollars,asetoftwo.ThecurrentuserterminalsofthebeidouaremoreexpensivethanthelowpriceoftheGPS,andnowtheGPSpricegeneralnavigationsystemisinthethousandsofRMB,withahighaccuracyoftensofthousandstotensofthousandsofRMB.Theuserterminalofbeidouiscurrentlyaround20,000yuan.

Anotherproblemisthatitsuseandfeaturesaredifferent,andGPSsolvesaproblemofwhereI'mlocated,suchasinthedesert,intheocean.AndthebeidounotonlysolvestheproblemwhereIam,italsosolvestheproblemwhereyouarehere,theuserterminalofbeidouactuallyhasthetransceiverfunction,

AndGPSonlywithfunctionsofreceiving,itonlyknowbyreceivingposition,thebigdipperissendingandreceivingfunction,itspositioningneedtolaunchandthengetposition,atthesametimeitslocationmaybepassedontoyoucanalsotothepeoplewhocareaboutyou,bigdipperisactuallyadoublefunctionpositioningandcommunicationequipment,isnotthesameasintheuserbase,receivingoccasionsarenotthesame.

Beidouwhenargumentinthatyear,thestateseismologicalbureauanearthquakeresearchinstituteresearcheroutareportoftheargumentisaboutthisproblem,thebeidousystemwillbecomealifelineengineering,isthehumansurvivalandactivitiesrelatedtosomeoftheprojects,suchasearthquake,allofourcablesystemaftertheearthquakemaylosefunction,thebeidousystemasasatellitemonitoringsystemcanhavethelocationofthereportintime,andcancommunicate,suchasatsunami,isactuallycausedbytheearthquake,whichisveryusefultodotherescue,itcantimelysendlocationandrelevantinformationrelatedtotheposition,wecansendtheinformationtotherelevantdepartments.Priceproblem,infact,thepriceisrelatedtothenumberofusers,onethousandusersandtenthousand,thousandsofusers,totheuserterminalcanhaveverydifferentcost,themaincostisintheuserterminal,beidouuserterminalsaidjustnowisthereisahairhave,withthedevelopmentofthebusinessusers,thecostwillbedown.Sothe"beidou"iscivilised.

Beidouno.1"potential,mainlyinthefieldofintegratedpositioningcommunication,thedemandonthecomprehensivefunctioniswillbefullyinthefieldofapplication,nowonlypositioningneedtocustomers,totheneedsofthebigdipperisnoturgent.Butfortheneedtohavebothpositionandpassedoutthepositionoftheuser,thebeidousatellitenavigationandpositioningsystemisveryuseful.

BeidoupositioningaccuracyisequivalenttoGPS,generallyaround1.2m.Atpresent,thebeidounavigationsystemisopentouseathome.

China'sbeidounavigationsystemcanbebroadlydividedintogenerationandgeneration.Agenerationofthreesatellites,consistingoftwoworkingstarsandabackupstar.OnMay25,2003inxichangsatellitelaunchcenterinChinawillbethethird"beidou"navigationandpositioningsatelliteintospace,markedtheourcountryhavetheirownfirstgenerationsatellitenavigationandpositioningsystem.Thefirsttwosatelliteswerelaunchedon31October2000and21December2000respectively.Thebeidousatellitenavigationandpositioningsystemisthefirstregionalnavigationsystemthatprovidessatellitenavigationinformationthroughouttheday.Stage2:

[1]

OnApril14,2007,Chinasuccessfullylaunchedthefirstbeidounavigationsatellite.