航天器1553B总线控制器RAM故障自主诊断与处理方法

Autonomous Diagnosis and Recovery Method for RAM Fault of 1553B Bus Controller on Spacecraft

在航天器中,1553B总线控制器(BC)作为总线信息交互的管理中枢,其可靠性直接关系航天器的系统安全。近年来,受单粒子事件的影响,多个航天器在轨发生总线芯片RAM损坏的故障。文章针对此问题,结合总线芯片BC模式的典型应用场景进行分析,提出RAM故障诊断的策略和自主分区故障处理的方法。该方法能够使BC端软件通过诊断自主发现故障,定位故障区域,并通过替换、隔离等手段排除故障,消除故障对航天器的影响。通过软件仿真,对故障诊断和处理的性能进行了试验验证,结果表明:采用该方法的软件能够自主发现故障区域并完成隔离和替换,且其处理的准确性和时效性都明显优于传统依赖地面遥控的方法。

In a spacecraft, 1553B BC （bus controller） is the management center of 1553B bus,and its reliability is directly related to the safety of the whole system. In recent years,due to the influ-ence of the space environment, single event will happen to the RAM of the bus chip when the spacecraft is on-orbit. The affection of the problem according to characteristics of different appli-cations is analyzed in the paper. Based on the analysis,the RAM fault autonomous diagnosis and recovery method is proposed. The BC software based on this method can detect fault, locate fault section and isolate or replace fault automatically, so the spacecraft can be recovered from the fault. The results show that the processing is completely in line with expectations through soft-ware implementation for diagnosis and recovery method. Its accuracy and timeliness are obviously better than the traditional method depended on the ground telecommand.