Research And Implementation Synchronization Algorithm Based On Time-trigger Ethernet

Base on the fast and continuous development of aviation, transportation andmedical services, Real time computer has been treated increasingly important part of thepopular research areas. Different companies have brought out different solutions onthose Ethernet network to meet various needs of different industries and those solutionshave been approved by industries. In multiple program competitions, Time TriggeredEthernet (TTE) comes to our eyes based on its inclusion of time trigger technology,fault tolerance mechanism and real time function into normal Ethernet’s flexibility,dynamics and “best-effort”. At the same time, TTE also adds new requirement into theclock synchronization in the network nodes of its particular time characteristic.This article applies study, research, analysis and simulation methods to make adeep study of TTE and realize the time protocol of TTE. Based on the study of TTEtechnology and OPNET simulation tool and the structure of system and internet format,we analyze the time synchronization protocol of TTP (Time-triggered Protocol), designthe calculation method of message permanence function and compression function.Byproviding simulation plan, constructing theory model, we made a successful simulationof TTE with certainty, fault tolerance and real time performance.TTE is consisted of terminal nodes, switches and links. This article designsterminal node model, switch model, the realization of OPNET simulation, and passthrough the functional test of those models. This article emphasizes the study ofsynchronization algorithm of TTE, plan of the process synchronized timing and thedesign of key calculation method of synchronization. Then, through building up thescene of terminal nodes and switches, as long as the single channel network topologyand the dual channel network topology, we come into the verification of theeffectiveness of clock synchronization algorithm. At last, by measuring network nodesynchronization precision, we come into the result of the single and dual channel’sclock synchronization accuracy.We make it into10nanoseconds and100nanosecondsto meet the needs of TTE. In the end of this article, we bring out the existing problems in TTE such as pooradaptation owning to the requirement of static configuration and the immaturity of thecalculation itself. However, we point out the future research direction for reference. Thestructure of TTE and synchronization algorithm designed by this article properly meetup the requirement of current real time application and could be used to develop relatedTTE products.