The Model And Analysis Of Integrated Avionics System Data Bus With Queueing Theory

This paper models integrated avionics system data bus MIL-STD-1553B with the Queueing Theory after acquainting detailedly with the communication protocol of the data bus, geting at the method of analysis, working out several important parameters and probability distributing, and analyzing quantitatively some systems of fixed order bus control.Firstly, the M/M/land M/M/2 models is built in fixed order bus control, paralleling with monolayer bus framework and two-double bus framework respectively. From analyzing contrastively, it can gain the parameters that monolayer bus framework and two-double bus framework can reach respectively in the same condition.Secondly, M/M/2 model is analyzed in two state, sharing Queueing and separate Queueing. From analyzing contrastively, it can conclude that the parameters of sharing Queueing model is better than separate Queueing model in the condition that probability of task assignment is equal. So in the system that timing of tasks have not priority ranks, it should choice sharing Queueing model. But if the time of tasks have priority ranks and the number of higher priority tasks is small, it should choice separate Queueing model for improve performance of system.Fanally, G/M/l model is built in fixed order bus control. M/M/n model is exact in theory only when there are all asynchronous tasks in data bus, and when there are synchronous tasks in the same period, it is approximative. In this paper, G/M/l model is built for this case, making theory model to closer to the practice system.