Modeling and Verification for CPS Space- Time Safety
Zhen Ye, Yi Zhu, JinYong Wang, Xiao Ying Chen · 2022
Cyber-physical systems (CPS) operate in open and uncertain physical spaces. In space-time related safety-critical software, how to quantify system performance and safety, model and verify the credibility of CPS has become a hot topic. Aiming at this problem, a Modeling and verification method for CPS space-time safety is proposed. Firstly, extend the space-time attributes and probability attributes of Architecture Analysis & Design Language (AADL) behavior annex, and propose the Safety Probability Architecture Analysis & Design Language (SP-AADL), which is used to model the space-time behavior of CPS systems with safety probabilities; Secondly, extend the space and probability properties of the process algebra-Time Communicating Sequential Process (TCSP), and propose Space Probability Time Communicating Sequential Process (SP- TCSP); Thirdly, the probability parameters are obtained by quantifying the state safety of the system through the statistical model test; Finally, by defining the model transformation rules, the SP-AADL model is transformed into the SP- TCSP model for formal verification, which proves the effectiveness of the method.