An HLA Federate as Gateway to Legacy Simulation Systems

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An HLA Federate as Gateway to Legacy Simulation
Systems

• First experiences and applications

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Motivation I
A Ground-Air model, which covers scenarios from
brigade to Corps level. GUPPIS supports Corps
frame and Division frame exercises at the
Exercise Center of the German army in Wildflecken
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Motivation II
Federation of the STC CAX Testbed based on ALSP
(Aggregate Level Simulation Protocol) ICD
(Interface Control Document)
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Aims and Targets I

• Conditions caused by HLA/RTI
• HLA/RTI architecture is based on Remote
  Procedure Calls (RPC)
• Missing Features of the RTI
• An RTI implementation for some legacy SimSys
  (e.g., GUPPIS-KORA in Fortran 77 on DEC Unix)
• Data marshalling and Encoding

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Aims and Targets II

• Requirements of the HLA Interface
• SimSys independent of actual communication
  infrastructure (RTI) Coupling of SimSys to
  C2I-Systems
• An easily adaptable and understandable protocol
  between SimSys and federation
• Reusable for other legacy SimSys, HLA Interface
  independent of actual FOM

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Design I
Gateway Architecture
SimSys

• Message
• Oriented
• Middleware
• Implemented in Java on Linux/Windows

MOM
HLA Federate
HLA
Federation
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Design II
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Advantages

• Decoupling of SimSys and federation due to
  asynchronous messaging and message buffering
• Distributed application of HLA Federate
• Easy and flexible adaption of
• ICD message protocol with SimSys
• Communication infrastructure of the federation
  (exchanging the RTI)

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ICD Message Protocol

• ICD message protocol based on ALSP
• HLA Federate provides a common Protocol interface
  for ICD protocols
• KORA-ICD
• used for GUPPIS KORA/OA
• JOANA-ICD
• Additional SimSys Control Messages
• Communication between JOANA components and other
  models with the BASIN simulation architecture

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Main Components

• ICD-Module
• Communicates to SimSys with TCP/IP
• Transformation of ICD messages to RTI services
  and RTI callbacks to ICD messages
• FedAPI
• Communicates to federation via RTI
• Encapsulates the actual Java RTI binding in an
  RTI access layer

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Java Packages I
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Java Packages II

• hla.rti13.java1 Java RTI Binding (libRTI)
• fed.rti Encapsulation of RTI services and RTI
  callbacks
• fed.util General utilities, like buffered
  queues, XDR data marshalling and encoding,
  protocol tool for debugging
• fed.net Communication with SimSys using TCP/IP
  sockets

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Java Packages III

• fed.hla Transformation of ICD messages to RTI
  services and RTI callbacks to ICD messages
• fed.rmi Distributed application of HLA Federate
  by Remote Method Invocation
• fed.app Various applications for management and
  service providing of the HLA Federate

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Applications

• Developed for interoperability and HLA
  compliance of
• GUPPIS KORA/OA
• JOANA (SimoF, ALICE, MEMO)
• SIGNAL
• Used by ALICE (JOANA) in the NATO pre-pathfinder
  DiMuNDS 2000federation

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JOANA Framework I
JOANA JOINT OPERATIONS ARMY NAVY AIR
Simulation system on the operational level
representing joint and combined
operations. JOANA is currently used in German
FüAk CAXes
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JOANA Framework II
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Résumé

• A reusable and easily adaptablemessage-oriented
  HLA interface for loosely coupled, ALSP, DIS,
  etc. compliant or other special federated
  solutions of legacy SimSys
• Current and future work Interoperability of
  GUPPIS KORA/OA with WARSIM 2000 and C2I-Systems