基于任务弧段的测控通信任务可靠性建模方法

Reliability model of TT&C and communication task based on task arc

基于对任务的弧段划分,建立了测控通信任务的可靠性模型.根据任务执行时序图,参与任务的测控通信资源及任务成败标准,将测控通信任务划分为不同的任务弧段,定义了正常任务弧段和空闲任务弧段,基于Markov过程,提出了正常任务弧段和空闲任务弧段的可靠性建模方法.提出了在考虑测控通信资源的开机准备时间和停机时间的情况下的可靠性建模方法,对测控通信任务重新划分任务弧段,各任务弧段依据相应方法单独建立模型,依次求解各模型可得整个任务的可靠性.最后以具体的测控通信任务为例,计算并分析了不考虑资源开机准备时间和停机时间、仅考虑资源开机准备时间、仅考虑资源停机时间以及考虑资源开机准备时间和停机时间的任务可靠性,验证了模型的正确性.

Reliability model of tracking,telemetry and command（TTC） and communication task was constructed based on task arc division.According to time sequence of TTC and communication resources,and the resources taking part in task and task success criterion,the TTC and communication task can be divided into several successive task arcs.General task arc and idle task arc were defined,and their reliability modeling methods were proposed by using Markov approach.Moreover,the modeling methods considering the preparation time after resource opening and the resource close time were proposed.In these cases,task arcs were re-divided,and each of them was modeled according to the corresponding methods discussed.The task reliability can be obtained by solving these task arc models one by one.Finally,examples with numerical results under several cases show efficiency of the modeling methods.