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1、ABSTRACTABSTRACTInrecentyears,manynaturaldisastersandemergencieshavefrequentlyhappenedinourcountry.Whenweresponsetotheseemergencies,theemergencybroadcasthasshoweditsspecialadvantagesandplayedanirreplaceableroleinreleasinginformationtimelyandguidethepublicopin
2、ions.ThetransmissionsoftwareofemergencybroadcastmessagesisbasedontheTechnicalSolutionsofEmergencyBroadcastSystemofSichuanProvinceandrelevanttechnicalspecifications,usesUDPmulticasttransmission,whichisrunontransmissionsystemofemergencybroadcastmessages.Thetran
3、smissionsystemofemergencybroadcastmessagescanbedividedintofoursubsystems:thepackagingserverofemergencybroadcastmessages,thetransmissionserverofemergencybroadcastmessages,thenetworkmanagementserverofresourcesandthereceivingserveroffeedbackmessages.Thissoftware
4、implementsthesoftwarepartofthefoursubsystemsrespectively,themaincontentsofthisthesisareasfollows:1.Thedesignandimplementationofthepackagingofemergencybroadcastmessages.BasedonTechicalSolutionsofEmergencyBroadcastSystemofSichuanProvinceandTSspecificationofMPEG
5、-2insystemlayer(ISO/IEC13818-1protocol),itimplementsthepackageofemergencybroadcastmessageswhichisreadytotransmit,thenpackstheemergencybroadcastmessagesintotheprivatesectionofemergencybroadcast,finallypacksitintoTSfileandstoresitinthelocalserver.2.Thedesignand
6、implementationofthetransmissionofemergencybroadcastmessages.Inspectthedatabasetableofemergencybroadcastmessages,obtaintheTSfileswhichmeettheconditionsofsendingthemandgeneratestheTScachedatalist,thenusethewayofUDPmulticasttosendTScachedatatothereceivingsystemo
7、femergencybroadcastmessages.Finallyweachievearatecontroloftransmission,whichmakesthesoftwaresendTSdataundertheconditionofCBRmode.3.Thedesignandimplementationofthenetworkmanagementofresources.Thisserverisusedformanagingtheequipmentresourcesbynetwork.Throughins
8、pectingtheworkingstateofthedatabasetable,theservercanobtaintheequipmentoperatinginstructions,thenpacktheoperatinginstructionsintotheresourcesmanagementIIABSTRACTmessages,andusethewayofUDP
