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1、紧急无线电示位标(epirb)（Emergencyradiobeacon(EPIRB)）Emergencyradiobeacon(EPIRB)Functionof1.EPIRBsystemAlarm(alarm):whenthecarrierisindanger,itcanautomaticallyormanuallylaunchdistressalarm.Identification(identification):thetransmittedalarmsignalcontainsidentificationinformationtofacilitateident
2、ificationofthevector.Location(position):positioninformation(GPS)inasignal,oritspositioniscalculatedbydetectingthesignalemittedbyit(usingDopplereffect).(homing)function:121.5MHz(foraircraftlocation)orbuilt-inSART.2.EPIRBclassification(1)COSPAS-SARSATsystem406MHzEPIRB;applicabletoallseaa
3、reas.(2)INMARSATsystemL-EPIRB(1.6GHz);appliesINMARSATcoveragearea.(shutdowntheL-EPIRBsysteminDecember1,2006,andtheInternationalMobileSatelliteOrganizationnolongeroffersit.)(3)VHF-EPIRB(CH70)ingroundcommunicationsystem;suitableforA1seaarea.Ithasbeendiscontinuedandtransmitteddistressaler
4、tmessagesonchannel70totheauthoritiesthroughtheVHFsystem.3.EPIRBpurpose:shiptoshorewarningSection1COSPAS-SARSATsystemcompositionandworkingmodelCOSPAS-SARSATsystemistheuseofspace,aviationandmaritimesatelliteterrestrialindistressalertandlocationinformationforsearchandrescuedepartmentsarou
5、ndtheworldforfree,formerlyknownas"cospasSARSATsystem",inrecentyears,thesystemisalsointroducedasageostationarysatellitetransponder,sonowthesystemwasrenamed"internationalrescuesatellitesystem".I.COSPAS-SARSATsystemcomposition1.systembeacon(1)landpersonalbeaconPLB(Personal,Locator,Beacon)
6、,Workingfrequency:406MHz,workmode:manualstart.(2)airbeaconELT(Emergency,Locator,Transmitter);Operatingfrequency:121.5MHz/243MHz,workingmode:impactormanualstart.(3)marinebeacon(EPIRB);Operatingfrequency:406MHz/121.5MHz;positionfrequency:121.5MHz/243MHzStartmode:manualstart,automaticstar
7、t.121.5MHZbeaconismainlyusedformotor,theperformanceofthe121.5MHZbeaconhasgreatlimitations,soin1999theinternationalsatellitesearchandrescueorganization,theinternationalmaritimeorganization,theInternationalCivilAviationOrganizationandtheInternationalUnionandotherrelevantorganizationsan
