GMDSS阅读材料.docx

GMDSS阅读材料.docx

《GMDSS阅读材料.docx》由会员分享，可在线阅读，更多相关《GMDSS阅读材料.docx（13页珍藏版）》请在冰点文库上搜索。

GMDSS阅读材料

ReadingComprehension

Passage1ThreetypesshipearthstationterminalsofInmarsat

SatellitesystemsoperatedbytheInternationalMobileSatelliteOrganization（Inmarsat）,arealsoimportantelementsoftheGMDSS.ThreetypesofInmarsatshipearthstationterminalsarerecognizedbytheGMDSS:

theInmarsatA,BandC.TheInmarsatAandB,anupdatedversionoftheA,provideship/shore,ship/shipandshore/shiptelephone,telexandhigh-speeddataservices,includingadistressprioritytelephoneandtelexservicetoandfromrescuecoordinationcenters.TheInmarsatCprovidesship/shore,shore/shipandship/shipstore-and-forwarddataandtelexmessaging,thecapabilityforsendingpreformatteddistressmessagestoarescuecoordinationcenter,andtheSafetyNETservice.TheInmarsatCSafetyNETserviceisasatellite-basedworldwidemaritimesafetyinformationbroadcastserviceofhighseasweatherwarnings,NAVAREAnavigationalwarnings,radionavigationwarnings,icereportsandwarningsgeneratedbytheUSCG-conductedInternationalIcePatrol,andothersimilarinformationnotprovidedbyNAVTEX.SafetyNETworkssimilarlytoNAVTEXinareasoutsideNAVTEXcoverage.

InmarsatCequipmentisrelativelysmallandlightweight,andcostsmuchlessthananInmarsatAorB.InmarsatAandBshipearthstationsrequirerelativelylargegyro-stabilizedantennas;theantennasizeoftheInmarsatCismuchsmaller.InmarsatalsooperatesanEPIRBsystem,theInmarsatL,whichissimilartothatoperatedbyCOSPAS-SARSAT.

UnderacooperativeagreementwiththeNationalOceanicandAtmosphericAdministration（NOAA）,combinedmeteorologicalobservationsandAMVERreportscannowbesenttoboththeUSCGAMVERCenter,andNOAA,usinganInmarsatCshipearthearthstation,atnocharge.ThereisalsonochargetoregisterforthisserviceandtoreceivethenecessaryInmarsatCsoftware.Formoreinformation,seetheNOAAShipboardEnvironmental（data）AcquisitionSystem,orSEAS.

WestronglyurgethatInmarsatCequipmenthaveanintegralsatellitenavigationreceiver,orbeexternallyconnectedtoasatellitenavigationreceiver.Thatconnectionwillensureaccuratelocationinformationtobesenttoarescuecoordinationcenterifadistressalertisevertransmitted.

Question:

1.WhichtypeofInmarsatshipearthstationterminalsareprovidedbytheGMDSS_________.

A.INMARSAT-C;B.INMARSAT-M;C.INMARSATMINI-M;D.INMARSAT-P

2.WhichtypeofInmarsatshipearthstationcanprovideSafetyNETservice?

A.INMARSAT-A;B.INMARSAT-B;C.INMARSATMINI-C;D.INMARSAT-M

3.ThewtitersuggeststhatINMARSAT-Cshipearthstations（）.

A.shouldhaveansatellitenavigator;

B.shoulebeconnectedtoasatellitenavigationreceiver.

C.A&B

D.AorB

4.Whichshipearthstationdoesnotrequiresrelativelylargegyro-satbilizedantenna?

A.INMARSAT-AB.INMARSAT-BC.INMARSAT-CD.BothA&B.

5.Themeaningofphrase“store-and-forward”inthepassageis（）.

A.firstmemorize,thenrelayB.memorizingmessage

C.directlysendmessageD.storeafile

6.INMARSAT-Lis（）.

A.INMARSAT-CsystemB.INMARSAT-B

C.EPIRBsystemofINMARSATD.COSPAS-SARASAT

7.Accordingtothepassage,whichofthefollowingisnottrue?

A.ameteorologicalobservationcanbetransmitedtoNOAAwithInmarsat-CSESatfreeofcharge.

B.AAMVERreportscanbetransmitedtotheUSCGAMVERCenteratcharge.

C.ItisnochargetoregisterforAMVERservice.

D.ItisnochargetoreceiveInmarsat-Csoftware.

Passage2Satellitecommunications

Theuseofsatellitecommunicationstoimprovemaritimesafetyisparticularlyimportantfortheintroductionoftheglobalsystemandforestablishingareliablecommunicationnetwork.

Satellitecommunicationswillbeusedinbothship–to–shoreandshore–to–shipdirections.TheINMARSATsatellitesystem,whichemploysgeostationarysatellitesandoperatesinthe1.5and1.6GHzfrequencybands,willprovideameansofalertingfromshipsbyusingshipearthstationsorsatelliteEPIRBsandacapabilityfortwo-waycommunicationsusingradiotelexandwillalsobeprovidedthroughtheINMARSATsystemusingeitherastandardshipstationandassociatedequipmentordedicatedfacilities.Anearpolar-orbitingsatelliteEPIRBservice,operatinginthe406-406.1MHzfrequencyband,willprovedamainmeansofdistressalertinganddeterminingthelocationoffloat-freeEPIRBsoperatingthroughthesystem..

Question:

1.WhichfrequencybandsdoesthegeostationarysatelliteswhichemploysbytheINMARSATsatellitesystemoperateon?

A.2MHzand4MHzB.4MHzand8MHzC.8MHzand12MHzD.1.5GHzand1.6GHz

2.Thenearpolar-orbitingEPIRBservice,operatinginthe（）frequencyband.

A.156.625MHzB.406-406.1MHzC.156.8MHzD.1.5GHzand1.6GHz

Passage3PublicCorrespondence

1.DSCChannelsforPublicCorrespondence

1.1VHF

TheVHFDSCChannel70isusedforDSCfordistressandsafetypurposesaswellasforDSCforpubliccorrespondence.

1.2MF

InternationalandnationalDSCchannelsseparatefromtheDSCdistressandsafetycallingchannel2187.5kHzareusedfordigitalselectivecallingonMFforpubliccorrespondence.

ShipscallingacoaststationbyDSConMFFORpubliccorrespondenceshouldpreferablyusethecoaststation’snationalDSCchannel.TheinternationalDSCchannelforpubliccorrespondencemayasageneralrulebeusedbetweenshipsandcoaststationsofdifferentnationality.Theshipstransmittingfrequencyis2189.5kHz,andthereceivingfrequencyis2177kHz.Thefrequency2177kHzisalsousedfordigitalselectivecallingbetweenshipsforgeneralcommunication.

2.TransmissionfoaDSCCallforPublicCorrespondencetoaCoastStationoranotherShip

ADSCcallforpubliccorrespondencetoacoaststationoranothershipistransmittedasfollows:

*TunethetransmittertotherelevantDSCchannel;

*SelecttheformatforcallingaspecificstationontheDSCequipment;

*KeyinorselectontheDSCequipmentkeyboard:

-the9-digitidentityofthestationtobecalled;

-thecategoryofthecall（routine）;

-thetypeofthesubsequentcommunication（normallyradiotelephony）;

-aproposedworkingchannelifcallinganothership.ProposalforworkingchannelshouldNOTbeincludedincallstoacoaststation;thecoaststationwillinitsDSCacknowledgementindicateavacantworkingchannel;inaccordancewiththeDSCequipmentmanufacturer’sinstructions.

*TransmittheDSCcall.DSC

3.RepeatingaCall

Coaststationsmaytransmitthecalltwiceonthesamecallingfrequencywithaninternalofatleast45secondsbetweenthetwocalls,providedthattheyreceivenoacknowledgementwithinthatinterval.

Ifthestationcalleddoesnotacknowledgethecallafterthesecondtransmission,thecallmaybetransmittedagainonthesamefrequencyafteraperiodofatleast30minutesoronanothercallingfrequencyafteraperiodofatleast5minutes.

4.PreparationforExchangeofTraffic

OnreceiptofaDSCacknowledgementwiththeindicationthatthecalledshipstationcanusetheproposedworkingfrequency,thecoaststationtransferstotheworkingfrequencyorchannelandpreparestoreceivethetraffic.

5.AcknowledgementofareceivedDSCCall

Acknowledgementsshallnormallybetransmittedonthefrequencypairedwiththefrequencyofthereceivedcall.Ifthesamecallisreceivedonseveralcallingchannels,themostappropriatechannelshallbechosenfortransmissionoftheacknowledgement.

TheacknowledgementofaDSCcallistransmittedasfollows:

*Useatransmitterwhichistunedtotheappropriatefrequency.

*InaccordancewiththeDSCequipmentmanufacturer'sinstructions,keyinorselectontheDSCequipmentkeyboard

-theformatspecifier（individualstation）;

-9-digitidentityofthecallingship;

-thecategoryofthecall（routineorship'sbusiness）;

-ifabletocomplyimmediatelyontheworkingfrequencysuggestedbytheshipstation,thesamefrequencyinformationasinthereceivedcall;

-ifnoworkingfrequencywassuggestedbythecallingshipstation,thentheacknowledgementshouldincludeachannel/frequencyproposal;

-ifnotabletocomplyontheworkingfrequencysuggested,butabletocomplyimmediatelyonanalternativefrequency,thealternativeworkingfrequency;

-ifunabletocomplyimmediatelytheappropriateinformationinthatregard.

1）Someorallthisinformationmightbeincludedautomaticallybytheequipment.

*Transmittheacknowledgement（aftercheckingasfaraspossiblethattherearenocallsinprogressonthefrequencyselected）afteradelayofatleast5sceonds,butnotlaterthan4-1/2minutes.

6.PreparationforExchangeofTraffic

Afterhavingtransmittedtheacknowledgement,thecoaststationtransferstotheworkingfrequencyorchannelandpreparestoreceivethetraffic.

Question:

1.WhichfrequencyisusedforDSCbetweenshipsforpubliccorrespondenceinMF?

A.2187.5kHzB.2189.5kHzC.2177kHzD.2174.5kHz

2.HowlongwillashipacknowledgeareceivedDSCcall?

A.atleast4-1/2minuteB.atmost5secondsC.4-1/2minutelaterD.between5secondsto4-1/2minute

Passage4

1.TestingTheEquipmentUsedForDistressAndSafetyCalls

TestingontheexclusiveDSCdistressandsafetycallingfrequenciesshouldbeavoidedasfaraspossiblebyusingothermethods.

ThereshouldbenotesttransmissionsontheDSCcallingfrequency156.525MHzandChannel70.However,whentestingontheexclusiveDSCdistressandsafetycallingfrequency2187.5kHzisunavoidable,itshouldbeindicatedthatthesearetesttransmissions（e.g.specialtestcalls）.

Testcallsshouldbetransmittedbytheshipstationandacknowledgedbythecalledcoaststation.Normallytherewouldbenofurthercommuni