航天测控系统任务可靠性分析的EOOPN模型

Mission reliability analysis of space TT&C system using extended object-oriented Petri net model

提出了一种可用于航天测控系统任务可靠性分析的扩展面向对象Petri网(Extend ObjectOriented Petri Nets,EOOPN)模型,旨在对给定的航天测控方案进行可靠性评估分析。针对问题特点明确了OOPN扩展思路,给出了EOOPN模型的形式化定义、运行规则和建模步骤,模型通过引入公共库所、激发弧、消息变迁和消息处理函数等概念,体现了面向对象的思想,具有很好的层次性和模块性。所建立的EOOPN模型能够完整地描述航天测控系统的组成和任务特点。通过对算例模型仿真运行,表明实验结果具有良好收敛性,与Markov解析值对比误差在1%以内,从而验证了模型的有效性。

A methodology is proposed to evaluate the mission reliability of TT＆C scenarios by modeling and analyzing space tracking,telemetry and command （TT＆C） system using extended object-oriented Petri nets （EOOPN）.The formal definition,operational rules and the modeling approach were given.It can embody the object-oriented idea by introducing the concepts of public place,message arc and message handle function into the model,and it has good hierarchical structure and modularity.The EOOPN model can completely describe the TT＆C system composite and mission process and reflect the dynamic stochastic factors in system operation.After simulating the EOOPN model,the case study reveals that the simulation results have a good convergence,and the errors are controlled within one percent compared with the analytical result of Markov models,proving the effectiveness of the model.