ITU R M 1467:2006
ITU R M 1467:2006 Prediction Of Sea Area A2 And Navtex Ranges And Protection Of The A2 Global Maritime Distress And Safety System Distress Watch Channel
Table of Contents
Annex1-PredictionofA2andNAVTEXranges1Overview
2PredictionofA2andNAVTEXranges
2.1IMOperformancecriteria
2.2Achievingtherequiredqualityofsignal
2.2.1Theeffectofreceivednoise
2.2.2C/Nrequiredforsinglesideband(SSB)radiotelephony
2.2.3C/NrequiredforNAVTEXbroadcasts
2.3Accountingforshipstopsidenoise
2.4Determinationofexternalnoisefactor,F[a']forthe
requiredavailability
2.5Accountingforpropagationbygroundwave
2.5.1Introduction
2.5.2Proofofperformancetests
2.5.3DeterminationofextentofA2servicearea
2.5.4DeterminationoftherangeachievedusingNAVTEX
operation
3ProtectionofA2watchfrequency
3.1Impactofsiteseparationonsystemperformance
3.2Estimatingtheleveloftheinterferencefield
3.3Requiredadjacentchannelselectivity
3.4Protectionfromadjacentchannelinterference
3.5Protectionfromtransmittersidebandnoise
3.6Co-siteoperation
4Softwarerequirements
4.1Noisecalculation
4.2Intermodulation