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Applying Model-Based Systems Engineering and Fidelity Quantification to Support Fair Fight in a Distributed Simulation System


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Current 5th and 6th generation fighter aircraft capabilities, and the DoD's push towards digital engineering have created an environment in which simulated testing using live, virtual, and constructive assets has increasing utility. These simulations need to be credible in the eyes of the stakeholders, which for distributed simulation systems includes establishing fair fight between simulation services. Fair fight is when multiple simulations interoperate without generating one-sided systematic advantages. Issues that impede fair fight can be categorized into interoperability issues at the simulations implementation level and incompatible representations of reality between underlying models. This research used model-based systems engineering to generate non-functional system requirements for fair fight. The requirement for alignment of models conceptual representation of reality, led the need to quantify fidelity. Fidelity metrics that speak towards system level complexity, adherence to property scope specifications, and real-world behavior accuracy were applied to a SysML driven simulation. It was concluded that metrics for structural decomposition can describe a models limitations and scope, while traceability between model properties and real-world specifications has more utility than a singular metric. Lastly, by generating referent data with external simulation, behavioral differences can be quantified and downstream effects due to low model fidelity can be detected.



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