航天电子系统IEEE1394总线可靠性模型研究

Research on reliability model of IEEE 1394 bus for aerospace electronic systems

数据总线作为综合电子系统的核心,它的可靠性是保证综合电子系统功能有效实现的关键。针对IEEE 1394总线,研究容错总线结构,分别分析基于stack-tree拓扑的双冗余以及环形冗余结构的节点失效模型。其中环形冗余stack-tree的模型运用递归函数。使用matlab仿真计算上述模型,定量的分析比较它们的容错性,得出环形冗余结构的可靠性更高,可超过0.99,且更稳定。研究结果对1394b总线的空间应用具有一定的参考意义。

As the core of the integrated electronics system, the reliability are keys to ensure the effective implementation of the functions of the system. The architecture of the fault-tolerant bus for IEEE 1394b is studied. Failure pattern of the fault-tolerant configurations is analyzed based on stack-tree topology. Nodes failing models have been constructed, those is of 1394 dual bus and of 1394 ring bus based on the stack-tree topology, respectively. The model description of the CSTR configuration is based on recursive function. Applying the models and using Matlab, reliability measures are been evaluated, that quantitatively compares the redundant bus architectures. The results demonstrate that CSTR leads to significantly more reliability gain which is greater than 0. 99, and steadier performance. The results will provide a significant guidance for space applications of 1394b bus.