第三章全部教案Word文件下载.docx
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【TheSpaceSegmentisprovidedbyInmarsat,andconsistsoffouroperationalcommunicationssatellites,withbackupsatellitesinorbit,readytobeusedifnecessary.Intheorbit,eachsatellitemovesatexactlythesamerateastheearth,andsoremainsinthesamerelativepositiontoanypointontheearth,abovetheearth’sequator.Inthisposition,antennasontheearthcanmaintaincommunicationswiththesatellite.TheInmarsatsatellitesarecontrolledbytheSatelliteControlCentre(SCC卫星控制中心)basedintheInmarsatHeadquartersinLondon,UK.
Eachsatellitehasacoveragearea,whichisdefinedastheareaontheearth'
ssurface(seaand/orland)withinwhichamobileorfixedantennacanobtainline-of-sightcommunicationswiththesatellite.Figure3-1showsthefoursatellitesinspace,andtheircoverageareas,correspondingtothefourOceanRegions:
●AtlanticOceanRegion-East(AOR-East).
大西洋东区
●AtlanticOceanRegion-West(AOR-West).
大西洋西区
●IndianOceanRegion(IOR).
印度洋
●PacificOceanRegion(POR).】
太平洋
3.1.1.2TheGroundSegment
地面段
1)EachofthesystemhasownnetworkofCESs
每个系统都拥有自己的地面站(A、B、C、M、F)。
任务:
建立PSDN,PSTN经本区卫星和MES的联系
2)NetworkCoordinationStation(网络协调站)
每区一个,联系本CESs,联系其他NCSs,进而联系其他洋区CESs,进行诸如入网和脱网的广播,并且联系OCC(操作控制中心);
3)OCC:
Operationcontrolcenter(操作控制中心)
协调和控制系统的工作;
4)INMARSATCES及NCS编码:
A系统:
CES不分洋区,二位八进制码
北京编码11,是第9号
四个协调站(NCS)的编码:
OCEANREGION
CESNO.
NCSNO.
协调站名
国别
POR
二位八进制
03(山口)
YAMAGUCHI
JAPAN
IOR
03
AOR-W
01(南伯里)
SOUTHBURY
USA
AOR-E
01
C系统:
CESID:
三位洋区号+编码(8进制)
NCS:
三位洋区号+44
COAST
REGION
码别
CES
NCS
TEL
Tlx
DATA
0+二位码
0+44贡西利.英
874
584
1114
1+二位码
1+44贡西利.英
871
581
1111
2+二位码
2+44圣淘沙.新
872
582
1112
3+二位码
3+44温泉关.希腊
873
583
1113
注:
TEL、TLX、DATA项代表洋区码,适用岸对船各系统的呼叫。
【TheGroundSegmentcomprises(包含)aglobalnetworkofCoastEarthStations(CESs),NetworkCoordinationStations(NCSs网络控制中心),andaOperationControlCentre(OCC操作控制中心).EachCESprovidesalinkbetweenthesatellitesandthenational/internationaltelecommunicationsnetworks.ThelargeantennasusedbytheCESstocommunicatewiththesatelliteforitsOceanRegionarecapableofhandlingmanycallssimultaneously(同时地)toandfromtheSESs.
ACESOperatoristypicallyalargetelecommunicationscompany,whichcanprovideawiderangeofcommunicationsservicestotheSESscommunicatingthroughtheCES.
EachoftheInmarsatcommunicationssystemshasitsownnetworkofCESs,asbelow:
●TheImnarsat-ACESs
●TheInmarsat-CCESs
●TheImnarsat-M/BCESs
ForeachInmarsatsystemaNetworkCoordinationStation(NCS)islocatedwithineachOceanRegion,tomonitorandcontrolthecommunicationstrafficwithinitsOceanRegion.EachNCScommunicateswiththeCESsinitsOceanRegion,andwiththeotherNCSs,aswellaswiththeOperationControlCentre(OCC)locatedintheImnarsatHeadquarters,makingpossiblethetransferofinformationthroughoutthesystem.】
3.1.1.3TheShipEarthStations
船舶地球站(SES)
【AShipEarthStation(SES)isadeviceinstalledonaship(oronfixedinstallationinamaritimeenvironment)toenabletheUsertocommunicatetoandfromshore-basedsubscribers,viaaselectedsatelliteandCES.】
3.1.1.4THEINMARSAT-ASYSTEM
A系统的简介
体积大,重量大,模拟信号2007、12、31将淘汰
天线:
伺服马达,具有方向性0.85---1.20米
TheINMARSATMobileNumber“IMN”
七位数字+四个字母+X
1570262YULOX
1:
A业务
570:
中国注册
262:
注册国编号
X:
水上移动业务
【ThiswasthefirstInmarsatsystem,introducedintocommercialoperationin1982,andnowprovidingtwo-waytelephone,telex,fax,electronicmail(E-mail),andotherformsofdatacommunications,includinghigh-speeddata(at56and64kilobits/sec).Recentdevelopmentsindatacompressiontechniques(数字压缩技术)enablethetransmissionofhigh-definition(高清晰)stillphotographs(静止画面),andevenslow-scanvideo(慢扫瞄电视),toandfromanImnarsat-ASES.
ThelargesizeandweightoftheImnarsat-AantennahasmeantthatInmarsat-ASESshavegenerally(通常)beenfittedonlargershipssuchasoiltankers,tradingvesselsandsuper-yachts.ThetotalnumberofmaritimeImnarsat-Aterminalsinuseallovertheworldwasover16,000atthestartof1994,andcontinuestogrow】.
3.1.1.5Thelnmarsat-CSystem
C系统的简介
体积小、重量轻、非实时传输(Non-realtime)
全方位、体积小(安装时注意位置的选择)
1)TheINMARSATMobileNumber“IMN”
9位:
4MIDXXXXX
C业务国别编号
376S.VINCENT
477H.K
412CHINA
431JAPAN
2)工作方式
非实时(Nonrealtime)
数据包(Datapackage)
经卫星分批Afterashort
发送interval
【TheInmarsat-Csystemwasintroducedin1991tocomplementtheInmarsat-Asystem,byprovidinglow-costglobalcommunicationsonasmallterminal,suitableforfittingonallvessels,largeandsmall.Itssmallsizemakesitespeciallysuitableforsmallervessels,suchasyachts,fishingvesselsorsupplycraft.TheInmarsat-Csystemdoesnotprovidevoicecommunications,butdoesprovideameansofsendingtextmessagesordatatoandfromanSES,usingstore-and-forward(存储转发)messaging.Thistechniquerequirestheuser(ateitherend)topreparethemessage/dataontheirendterminal,thentransmititviatheInrnarsat-Csatellitesystemtothereceivingend.There,afteradelayofafewminutes,themessage/datamaybeprinted,viewedand/orstored.SomeoftheInmarsat-Ccommunicationsservicesarelistedbellow,】
C系统的主要业务
●【TheabilitytosendorreceivemessagesbetweenanInmarsat-CSESandashorebasedtelexterminal,personalcomputerorelectronicmail(E-mail)service.AnInmarsat-CSEScanalsosendtextmessagestoashore-basedfaxterminal.
Specializedfaxbureauservices(传真运营商)areavailabletoconveytextmessagesfromshorebasedfaxmachinestoInmarsat-CSESs.】
C系统传真的发送:
船到CES以电传形式,CES到用户将转换成传真形式传输
●【TheEnhancedGroupCall(EGC)services,whichenableauthorizedshore-basedInformationProviderstosendinformationtoselectedgroupsofSESs-thesemaybewithinadefinedgeographicalarea,orbelongtoadefinedgroupsuchasashippingcompany.TwoEGCservicesareavailable:
】
(a)SafetyNET,whichisusedtobroadcastMaritimeSafetyInformation(MSI)toships.
安全网:
向某一洋区或地理区域进行的航警、气象的广播
(b)FleetNET,whichisusedtypicallybycompaniestosendcommercialinformationconfidentially(可靠)toshipsbelongingtotheirfleet.
船队网:
向一个船队进行的商业性广播
●ThedistressalertingandmessagingcapabilityofanInmarsat-CSES,whichmaybeusedtosendadistressalertormessagewithtopprioritytoaRescueCoordinationCentre(RCC).
3.1.1.6Thelnmarsat-Msystem
体积小、重量较轻、无电传业务,不符合GMDSS要求
6MIDXXXXX
TheInmarsat-MsystemwasintroducedinDecember1992,tocomplementtheexistingservices,byprovidingglobaltelephonecommunicationsonanSESwhichisinexpensiveandcompact(紧凑)insize.AnInmarsat-MSESissmallerandlighterthananInmarsat-ASES,makingInmarsat-Msuitableforsmallervesselssuchasyachtsandfishingvessels,aswellaslargervesselssuchascruiseliners,andtradingvessels.
TheservicespossibleonanInmarsat-MSESincludetwo-wayglobaltelephone,faxandcomputerdatacommunications.(M系统没有电传)
Inmarsat-MSESscanbepurchasedaseithersingle-channelormulti-channelmodels(butnotethatamulti-channelSESgenerallyrequiresgreatertransmissionpowerthanasingle-channelSES,sotheantennaand/orpowersupplyforamulti-channelSESmodelwouldbelargerand/orofhighergainthanforasingle-channelSES).
3.1.1.7Thelnmarsat-Bsystem
体积A系统类似,应用了数字技术,天线有方向性
3MIDXXXXX
Inmarsat-BisintendedasthesuccessortoImnarsat-A,providingitsservicesatlower-chargesthanImnarsat-A,althoughthetwosystemswillco-existformanyyears.
TheInmarsat-Bsystem,beingintroducedin1994,usesdigitaltechnologytoprovidehighqualitytelephone,fax,telexanddatacommunications,withtheantennasizeandweightapproximatelythesameasthatofImnarsat-A.
Single-channelandmulti-channelImnarsat-Bmodelswillbeavailable.Inmarsat-Bwillalsobecapableofhigh-speeddatacommunications(atupto64kilobits/sec),makingitespeciallysuitablefordata-intensiveuserssuchasoilcompaniesandseismologicalcompanies,whichneedtoexchangelargeamountsofdataonaregularbasis.
3.1.2INMARSAT-ACommunicationsservices
A业务
3.1.2.1Introduction
【TheINMARSAT-Aterminalgivesaccesstoawiderangeofcommunicationservicesfrompracticallyanywhereontheglobe,toanyotherlocationthroughouttheworld.ThecommunicationserviceswhichtheSESoperatorcanusedependmainlyonthetypeandinstallationoftheSESterminal,butarepresentativeselectionoftheInmarsat-Aservicesavailableare:
------distresscommunications
------automaticdial--uptelephonecalls
------automaticdial--uptelexcalls
------automaticdial--upfacsimilecalls】
Inaddition,orasanoptionalextra,youcanaccessotherservices,including:
------mediumspeeddata(2.4--9.6kbps)中速数据
------highspeeddata(56or64kbps)高速数据
------slow--scantelevision慢扫描电视
------voice/datagroupcall语音/数据组呼
------internationalpacketswitching国际分组交换
------person--to--personcalls叫人电话
------collectcalls受付费
------creditcardcalls预付卡
------timeandchargesinformationatendofcommunication
通信结束计费及时长通知
------nationalandinternationalinformationservice国内国际查询
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