Based On Real-time Highly Reliable Fault-tolerant Architecture Of Communication Protocol Research

In the field of aerospace, the reliability of the flight control computer which is the corefunction of aerospace vehicle control system is very high. This paper mainly takes a certain typeof aerospace vehicle flight control computer development project as the background, analyzesdemands and characteristics of the flight control task, researches on the flight control computerprocessing architecture by the redundancy technique and puts forward a correspondingcommunication protocol for the "1+3mode" redundant fault-tolerant architecture which has beenestablished. The communication between the control node and task nodes of the "1+3mode"redundant fault-tolerant architecture plays a critical role in the entire flight control task; thereforethe study of the communication protocol has practical significance.Firstly, this paper introduces1553B bus and its related concepts, and introduces redundantfault-tolerant technology, synchronization technology and a reliability model, which are thetheoretical basis for researching on the fault-tolerant architecture of the flight control computer.Secondly, the model of dual processing frame is selected for this type of flight controlcomputer from operational equilibrium angle by analyzing the basic processing mode of theembedded computer processing architecture and the flight control computer’s task characteristics.Combined with redundant design basic principle, two processing architectures,"1+3mode"redundant processing architecture and "3+3mode" redundant processing architecture, aredesigned by the different levels of redundancy design in the various functional modules for themodel of dual processing frame. Based on the basic principle of space field reliability design, the"1+3mode" redundancy architecture is identified as the flight control computer processingarchitecture.Thirdly, for the cooperation processing mode of the "1+3mode" redundant processingarchitecture, the communication control unit and control unit are respectively used as the controlcenter and the operations center of the flight control computer. The interaction between two taskunits directly determines the success or failure of the final flight control task. In order to meet theinteractive real-time and reliability requirements of the two tasks, the communication protocolbetween them has been designed from the interaction, interactive frame structure andsynchronization mechanism.Finally, the communication protocol has been realized by using the embedded developmentenvironment and experiment has been carried on to test the performance and functionality of thecommunication protocol.