Research On Fault Tolerance Technology Of Microsatellite Integrated Electronic System Based On Operating System

As satellite missions become more diversified and more complex,on-board integrated electronic systems have begun to develop in the direction of multi-task scheduling,high-speed computing,highspeed transmission of mass data,and large-capacity storage.Traditional aerospace-grade processors have been unable to meet current needs,and the use of industrial-grade components and operating systems has become an inevitable trend of development.However,industrial-grade components do not have the ability to resist radiation and are susceptible to failures caused by high-energy radiation particles in a complex space environment.Therefore,the use of fault-tolerant technology to improve the reliability on-board integrated electronic systems based on industrial-grade components has become one of the hottset research direction.Combined with the development trend of fault-tolerant technology for integrated electronic systems of micro-satellites at home and abroad,this paper carried out the research on fault-tolerant technology of on-board integrated electronic systems for ZHX satellite project requirements from three aspects: system fault-tolerant architecture design,on-board reliability loading design based on operating system and system-level redundant backup management plan.The main contributions of this paper are as follows:1.For the functional requirements of the ZHX project,such as supporting operating systems,on-orbit intelligent computing,and on-orbit replaceable upgrades,a integrated electronic system dual-computer heterogeneous backup redundancy architecture was designed,and the efficiency of data transmission was improved through the separation of high-speed and low-speed data buses.Significant data is backed up by point-to-point communication to improve the data transmission fault tolerance of the entire system.2.For the requirements of on-board reliability loading based on operating system,three modes of reliability loading based on triple modular redundancy are proposed,and the loading process is analyzed and researched from the aspects of loading efficiency,resource consumption,portability and reliability.And completed the on-board reliability loading module design based on the operating system and FPGA code implementation.3.For the multi-processor competition mechanism under the dual-computer heterogeneous backup redundancy architecture,two redundancy management methods,parent-level arbitration and same-level autonomous system backup management methods,are proposed,which solves the problem of management rights conflicts under warm backup and realizes smooth and reliable transfer.And further designed and realized the master-slave switching process and the system information synchronization mechanism between the master-slave system,and improved the system reliability under the dual-computer heterogeneous backup redundant architecture design.In summary,the integrated electronic system architecture designed in this paper adopts the hardware architecture of ARM processor equipped with operating system and intelligent computing unit,and adopts reliability loading design and redundancy management scheme reinforcement,so it has high performance and high reliability.And other advantages,to meet the design requirements of the ZHX satellite integrated electronic system.The design ideas of the proposed system architecture,on-board reliability loading method and system-level redundant backup management scheme are universal,and the functional modules are portable so it can be used in other satellite systems.