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| High Level Architecture (simulation) | |
|---|---|
| Name | High Level Architecture (simulation) |
| Acronym | HLA |
| First published | 1996 |
| Developer | IEEE Standards Association |
| License | IEEE |
| Website | IEEE |
High Level Architecture (simulation) High Level Architecture (HLA) is a standardized framework for distributed simulation interoperability that enables multiple simulation systems to interoperate as federates within a federation. HLA provides rules, interface specifications, and object-model templates to coordinate synthetic environments and supports temporal and data management for complex simulations.
HLA defines a set of rules and an interface specification that govern how simulation components called federates interact within a federation, enabling reuse across projects such as Operation Desert Storm, Joint Strike Fighter program, NATO exercises, United States Department of Defense, DARPA, Lockheed Martin, and Raytheon Technologies. Influential in simulation communities that include users from NASA, European Space Agency, United States Air Force, United States Navy, US Army, and industry partners like Boeing and Northrop Grumman, HLA aligns with standards and doctrines that intersect with procurement programs such as F-35, AH-64 Apache, and multinational initiatives like NATO Allied Command Transformation. Adopted in training centers such as Army National Training Center and applied in research at institutions like MIT, Stanford University, Carnegie Mellon University, University of Oxford, and Imperial College London, HLA established a common semantic and temporal grounding that facilitated federated simulation in contexts including NATO Exercise Trident Juncture and academic collaborations funded by National Science Foundation.
Initial HLA specification work was driven by the United States Department of Defense to replace legacy protocols such as the Distributed Interactive Simulation (DIS) protocol used during events like Operation Allied Force and developed under programs involving contractors such as General Dynamics and SAIC. The standardization effort involved organizations including IEEE Standards Association, SISO (Simulation Interoperability Standards Organization), and research groups at MITRE Corporation, RAND Corporation, Johns Hopkins University Applied Physics Laboratory, and DARPA. Major revisions corresponded with broader technology shifts influenced by vendors like Sun Microsystems, Microsoft, Oracle Corporation, and IBM, and were shaped during industry fora hosted at places like Palantir Technologies conferences and NATO-sponsored workshops linked to Allied Command Transformation. Standards harmonization referenced organizational practices from International Organization for Standardization, and academic contributions from University of California, Berkeley and Georgia Institute of Technology informed interfaces and object modeling.
HLA comprises a federation execution managed by a Runtime Infrastructure (RTI), where federates implement simulation logic; the RTI provides services analogous to middleware from companies like Red Hat or VMware and is implemented by vendors such as Pitch Technologies, Makena Technologies, and Bohemia Interactive Simulations. The HLA Object Model Template (OMT) defines interaction and object classes, informed by modeling approaches used at Los Alamos National Laboratory and Lawrence Livermore National Laboratory. Federates register object instances, subscribe to attributes, and send interactions; these mechanisms enabled integration across platforms from Windows NT to Linux distributions developed by Canonical (company). The architecture supports modular federation design used in programs like Joint Distributed Engineering Plant and exercises such as Red Flag and RIMPAC.
The Federation Object Model (FOM) and Simulation Object Model (SOM) specify shared data schemas and semantics, paralleling model-driven practices seen in NASA missions and aerospace efforts at European Space Agency. FOMs enable attribute ownership, update rates, and data typing to coordinate heterogeneous systems from contractors such as Thales Group and BAE Systems. Data encoding and transport options integrate with middleware standards promoted by OMG (Object Management Group) and can interoperate with service-oriented architectures pursued by Siemens and Honeywell International. Use of FOMs in multinational programs like NATO exercises and industrial collaborations with Airbus requires semantic governance similar to practices at International Electrotechnical Commission.
HLA provides time management services including conservative and optimistic synchronization strategies, influenced by research from Lawrence Berkeley National Laboratory and Carnegie Mellon University. Federates use logical time, time advance requests, and lookahead concepts to coordinate causality, as studied in contexts such as High Frequency Trading research and simulation of events like Hurricane Katrina emergency response exercises which involved agencies such as Federal Emergency Management Agency. Implementations draw from concurrency control techniques developed in database research at IBM Research and transaction models used by Oracle Corporation, enabling distributed time-stepped and event-driven federations applied in projects by Sandia National Laboratories and Argonne National Laboratory.
Performance engineering for HLA federations addresses latency, bandwidth, and scalability concerns relevant to large-scale exercises like NATO Exercise Trident Juncture and industrial simulations used by Siemens and General Electric. Quality of Service (QoS) parameters, dead reckoning algorithms, and interest management strategies reduce network load and align with research from Bell Labs and AT&T Research. Profiling tools from vendors such as Intel Corporation and NVIDIA accelerate computational kernels used in federates for physics simulation libraries originating from CERN and graphics frameworks by Epic Games and Unity Technologies. Security and access control in federations reference frameworks from National Institute of Standards and Technology and practices used by Department of Homeland Security.
HLA is implemented in commercial RTI products by Pitch Technologies, MAK Technologies, and open-source projects influenced by communities around Apache Software Foundation and GitHub. Use cases span aerospace programs like F-35, training systems at Air Combat Command, distributed mission rehearsals for NATO, maritime simulations involving Royal Navy, traffic and transportation modeling used by Transport for London and urban planning studies at Massachusetts Institute of Technology. Research applications include agent-based experiments at Santa Fe Institute and climate modeling collaborations involving NOAA and European Centre for Medium-Range Weather Forecasts. HLA federations support interoperability in procurement programs like Defense Logistics Agency initiatives and multinational joint training such as RIMPAC.
Category:Simulation