The Design And Implementation Of SpaceWire Bridge Based On TTE

With the continuous development of China’s aerospace industry,the next generation aerospace integrated electronic system has put forward higher requirements on the networkcentric electronic platform in terms of bandwidth,real-time capability,fault tolerance,compatibility,and economic cost etc.However,it has gradually become unable to satisfy the demands of future aerospace applications that requires highly integrated functions and highly shared resources due to the low speeds and limited performance of the aerospace electronic systems with various and complicated types of buses,poor integration and scalability.Since TTE(Time-Triggered Ethernet),with the advantages of real-time and resistance to sudden,fully use of network bandwidth resources,is quite qualified for comprehensive transmission of multiple types of business,and realization of the unification of real-time and non-real-time applications.Therefore,it has been applied in aerospace,rail transit,vehicle electronics and other control scenarios for the excellent adaptability and scalability.However,most of the aerospace electronic systems equipment currently use traditional aeronautical data buses standards that cannot be directly applied to aerospace integrated electronic systems based on TTE.consequently,it is of great importance that to research the aerospace integrated electronic systems based on TTE and the compatibility between TTE and the existing aerospace buses networks.Combined with the project "Research on Integrated Aerospace Electronic System Based on Time Triggered Ethernet",the thesis introduced the current research and future development of aerospace electronic system,which illustrates the limitations of traditional shuttle electronic system bus and the advantages of TTE as a new aerospace integrated electronic system buses.In addition,the implementation principle of the compatibility between TTE network and the SpaceWire buses is analyzed,which proves that the establishment of the addressing mapping mechanism and the dedicated protocol conversion bridge between the TTE networks and the SpaceWire buses is the key to achieving compatibility between the TTE and SpaceWire buses.Thirdly,it designs the overall scheme of the TTE-SpaceWire bridge according to specific needs,and introduces the structures,functions and work flows of each module inside the bridge.At last,the detailed design and implementation of TTESpaceWire bridge modules are described.A special simulation verification platform is designed to simulate and verify the function of the bridge.The innovation of this thesis is as follows: firstly,an addressing mapping mechanism between TTE networks and SpaceWire buses is proposed.Secondly,a dedicated TTESpaceWire protocol conversion bridge that is embedded in TTE switches is designed,which works for the cross-network transmission of various business flows in the electrical systems,as well as the realization of the information communication between the TTE end systems and the SpaceWire terminals.Thirdly,it establishes a dedicated simulation verification platform to verify the functions of the TTE-SpaceWire protocol conversion bridge.It was verified that the bridge design is correct,corresponding to the expected goal.