空间计算机存储单元容错性研究

Research on Fault Tolerant of Spacecraft Computer Storage Units

摘要:

近年来随着商业航天的发展，空间飞行器计算机系统开始大量使用工业级甚至商业级电子元器件，这种设计带来众多优点的同时却存在一个严重问题：商用芯片无法直接适应空间环境，商用元器件存储单元在空间环境下现单粒子多位翻转MBU（multiple bits upset）的情况越来越多，传统容错方法由于纠错能力不足无法解决此类问题，为解决上述不足文中提出了一种改进型准循环码作为容错方法来解决单粒子多位翻转问题。仿真和试验结果表明，该方法可以满足存储单元相邻位2位、3位翻转的纠错需求，且编码逻辑简洁，编解码延迟较低，适于工程应用。

Abstract:

With the development of commercial aerospace in recent years, space computer systems are increasingly using industrial-grade or even commercial-grade electronic components to complete the design, this design method brings many advantages but there is a serious problem: commercial chips cannot directly adapt to the space environment, component storage units are more and more affected by MBU（multiple bits upset）, the traditional fault-tolerant methods cannot solve such problems. In order to solve the above shortcomings, a new algorithms of error correction code is proposed as a fault-tolerant method to solve the MBU problem in the space environment. The simulation and test results show that this method can meet the error correction requirements of adjacent 2 bits and 3 bits of the storage unit, the coding logic is concise and the codec time delay is low, which is suitable for engineering applications.