Although the importance of scenarios in modeling and simulation has long been well known, there still exists a lack of common understanding and standardized practices in simulation scenario development. This paper proposes a Domain-Specific Language (DLS) to provide a standard scenario specification that will lead to a common mechanism for verifying and executing aviation scenarios, effective sharing of scenarios among various simulation environments, improve the consistency among different simulators and simulations, and even enable the reuse of scenario specifications. Following DSL design practices, the proposed Aviation Scenario Definition Language (ASDL) will provide a well-structured definition language to formally specify complete aircraft landing scenarios. In order to capture the necessary constructs for a simulation scenario, Simulation Interoperability Standards Organization (SISO) Base Object Model (BOM) is adopted as the baseline metamodel. This baseline is extended using the fundamentals of aircraft landing that cover all the domainrelated concepts and terminology as constructs. By taking a formal approach in defining aviation scenarios, ASDL aims at providing consistency and completeness checking, and model-to-text transformations capabilities for various targets in the aviation scenario definition domain. The results of this work will be used to develop a graphical modeling environment and automatic means to transform scenario models into executable scenario scripts. The work presented here is the first stepping stone in formal scenario definition in aviation domain.
Formal methods offer well-defined means for mathematical verification of the functional specifications of software systems. For model-based engineering, model checking is a verification technique that explores all possible system states. The Aviation Scenario Definition Language is a domain-specific language designed based on a scenario development process from a model-driven engineering perspective. It aims at providing a well-structured definition language to specify departure, en route, reroute , and landing scenarios. This paper uses statecharts and a model checker for the verification of each scenario generated and uses examples to demonstrate conformance to the rules established in the statecharts to verify the logic of all future scenarios.
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