Research of System Modeling and Verification Method Combine with UML Formalization Analysis and Colored Petri Net

Because of complexity of CTCS-3 train control system, interworking testing and function evaluation could not be operated directly on the system, which means that deep research on modeling and simulation of train operation control system should be carried out. This paper proposes a modeling and verification method based on UML and colored Petri net. On the basis of analysis of advantages and disadvantages of UML modeling, colored Petri net is used as formal specification of UML modeling, which improves scalability of formal method and make up for the deficiency of UML, as lack of analysis of model and verification method. Aiming at sequence diagram, dynamic model of UML, colored Petri net is suggested as a modeling method. Sequence diagram of communication between on-board and RBC during conversion from CTCS-3 to CTCS-2 is designed and transformed into colored Petri net model. Based on information interaction between objects to each other, colored Petri net model of onboard and RBC is obtained. Using CPN tools, the model is simulated and analyzed boundedness and deadlock of model. Thus, correctness of model is verified.