基于COTS的宇航计算单元冗余架构可靠性研究

Research on reliability of redundant architecture of COTS based device space computing unit

摘要:

随着商业航天的发展,为了能以更低成本将宇航计算单元得到应用,需要结合设计成本、预期寿命、实时性和系统复杂度等因素,对不同计算单元冗余架构的可靠性进行评估。目前在基于高性能商用货架(Commercial Off-The-Shelf,COTS)器件的宇航计算单元研究多满足于工程应用,缺乏关于对不同架构可靠性的对比。首先,针对几种不同冗余计算单元冗余架构,简单介绍具体的拓扑结构和工作方式；其次,根据工作方式给出了他们的故障状态转移图；第三,根据上述几种架构,运用马尔可夫模型理论,对这些计算单元结构进行可靠性建模可靠性模型,在考虑失效率和维修率两个参数对系统可靠性影响的情况下,并以一个虚拟的长时期任务为背景对各结构的可靠性指标进行了评价。仿真结果为更低成本基于COST器件制造宇航计算单元提供了设计支撑。

Abstract:

With the development of commercial aerospace, in order to apply space computing units at lower cost, it is necessary to evaluate the reliability of redundant architectures of different computing units in combination with design cost, life expectancy, real-time performance and system complexity. At present, the research on Aerospace computing units based on high-performance commercial off the shelf (COTS) devices is mostly satisfied with engineering applications, and there is no comparison on reliability of different architectures. First of all, it introduces the specific topology structure and working mode of several redundant computing units. Second, it gives their fault state transition diagram according to the working mode. Third, according to the above-mentioned architectures, it uses Markov model theory to model the reliability of these computing unit structures, considering the failure rate and maintenance rate Under the influence of parameters on the system reliability, the reliability indexes of each structure are evaluated against the background of a virtual long-term task. The simulation results provide the design support for the lower cost Aerospace computing unit based on cost devices.