The JTLS-JCATS federation will address issues associated with multi-resolution modeling in a High Level Architecture (HLA) federation. In general, the Joint Theater Level Simulation (JTLS) will represent aggregate-level objects while the Joint Conflict and Tactical Simulation (JCATS) will represent entity-level objects. Most theater operations will be conducted in JTLS whereas JCATS will simulate tactical operations or functions for which detailed modeling is required. The ultimate objective for this federation is an integrated system that provides a capability to exercise real-time, warfighter-in-the-loop, exercise and analysis of simulated forces that can be executed on-call at user-selectable levels of resolution from the entire force to an individual system concurrently or separately. If successful, this federation will give the Joint Warfighting Center (JWFC) the capability to provide the joint simulation community an integrated JTLS and JCATS simulation system capable of supporting multi-level exercises including an expanded, combined, integrated, theater operations with urban, small unit, and entity system actions. This paper addresses the issues associated with designing such a federation, including challenges with aggregation and disaggregation of object data, data exchange required to handle fundamentally different algorithms inside the respective simulations, and effects of time management. In addition, this paper discusses the status of a prototype federation being developed in FY02.
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