Abstract: In order to realize the time synchronization of the hardware redundancy embedded integrated electronic information system,a stable time synchronization model and a multi-node time synchronization framework are proposed in this paper.The master node time server is generated by the master-end competition,and the mode control method is used to dynamically detect the state of the working node.The server and each node complete a reliable synchronization process after two handshakes,including manual and automatic synchronization methods.The software-based implementation method can be deployed at any node in the system without the need for a separate time server,and meet the multi-bus data transmission interface.The test results have verified that the system synchronization accuracy in the LAN is less than 1ms,which is 10% higher than NTP synchronization reliability,as well asreduce the amount of synchronized data per unit time by half.It adapts to data transmission methods such as CAN,Ethernet and serial ports,and can complete synchronization of multiple time types.The method has achieve reliable time synchronization of the integrated electronic information system.

Key words: Embedded distributed system, Integrated electronics, Master-end competition, Mode control, Time synchronization