| In recent years,the frequent occurrence of natural disasters has caused the failure of the communication devices and the interruption of the communication link that has hampered rescue efforts.Thus,constructing a reliable emergency system with no blind area is essential and has become a hot topic.The key barrier to emergency system has been lack of suitable communication scheme and management architecture to deal with reams of data.Since Beidou satellite has advantages of low bit error rate,no communication blind area,etc.,communication technology based on Beidou short-message service has been widely used in rescue work and fishing boat location.Thus,building remote communication system based on Beidou short-message communication has great practical significance,however,there are still problems such as low reliability,low efficiency and limited interaction.This thesis presents novel management architecture and protocol for remote data transmission over beidou short-message communication.Firstly,overall architecture of remote data transmission system based on Beidou communication is constructed,making it possible for the application of Beidou short-message transmission to the emergency system.Secondly,reliability and efficiency of data transmission can be achieved whereby customized protocol.Thirdly,terminal protocol is designed based on analysis of user demands.Finally,this thesis proposes the design of an embedded communication device(Beidou communication device,BCD for short)and develops a corresponding management mechanism,realizing robust transmission of remote data.Through the research of this thesis,reliable remote communication system based on Beidou satellite is constructed.Based on BCD,lots of experiments are carried out and the practical results show the effectiveness of these methods.Research findings of this thesis provide a method for data transmission under emergency conditions,which has the certain research value and the wide application prospect. |
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