Spring 98 SIW Paper

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Migration of Legacy Applications
Bret R.Givens VERIDIAN Veda Operations 5200
Springfield Pike, Ste 200 Dayton, OH
45431 937-253-4770
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AFRL Lethal UAV Objectives

• Support Need for Lethal UAVs to Employ Sensors
  and Weapons in High Threat Areas
• Analyze Concept of a Cooperative, Multi-ship
  Force Package Employment
• Provide an Integration of Distributed Assets With
  Their Individual Capabilities, Into One
  Cooperative Package
• Develop a Human Performance Monitor (HPM) to
  assess human impact on mission performance

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Test RPR Federation
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Multiple Federation Test Case
Multiple Federation Federate HelloWorld
FOM RPR-FOM
f18 Simulation VR-Link
HelloWorld Federate
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Lethal UAV Multiple Federation
Physiological Data, Cockpit Switch Hits Timing
Information
Various Simulations including EDSIM and UAV
simulations
Threat Model(s)
Human Performance Monitoring Federate
3LA Cockpit Federate
EDSIM/MSS VR-Link
RPR FOM
Human Performance FOM
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SMV Project Objectives

• Goal Demonstrate Crew System Concepts for
  Real-Time or Near Real-Time Command and Control
  (C2) and Use of Space Assets Consistent with
  USAFs Vision of Global Engagement
• SMV Project Objectives
• Conduct Mission and Function Analyses of an
  Unmanned System
• Develop Ground Control Station Interface
  Requirements
• Demonstrate Feasibility of Interface Concepts
• Explore Application of Distributed Simulation
  Technologies Employing HLA Crew System
  Development Activities

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Space Maneuver Vehicle

• Reusable Orbital Vehicle
• Completes On-Orbit Mission and Re-Enters and
  Lands for Refurbishment
• Maneuverability In Space
• Difficult to Target and Track
• Re-Tasking
• Global Access from LEO
• Unmanned and Diverse Payloads
• Missions
• Space Control
• Force Enhancement
• Force Support
• Peacetime Support of Non-DoD Agencies

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SatTrak

• Displays satellite pass information on a world
  map or in tabular form
• Provides a wide variety
• of information on passes
• whether satellite will be
• in sunlight
• calculates great circle
• bearings, MUF plots,
• Maidenhead grid locations, antenna lengths, etc.
  
• Shareware

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Migration Steps

• Developed space fomlette
• ephemeris data
• interactions
• Ported SPG4 from C to C
• Used Hello World as template
• Replace country object with SatTrak object
• RTIs ownership push model implemented to
  divest SatTrak entities attributes

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Test SMV Federation
Space Maneuver Vehicle FOM (SMV-FOM)
Run-Time Infrastructure (RTI)
Network Communications
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Assumptions

• Being migrated to an ADS architecture
• Provides necessary baseline capability
• Some deficiency
• Utilize other existing capabilities to provide or
  enhance necessary capabilities

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Object Management

• Reengineering a legacy application costs
  significantly less than new system development
• HLA Object Management allows federates to share
  responsibility for updating object attributes
• Object management is a powerful tool for
  migrating legacy applications

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Time Management

• Allows a variety of styles of federation
  executions
• Real-time vs. scaled real time vs.
  as-fast-as-possible executions
• No causal guarantees vs. repeatable, causal
  executions
• Allows federates with different time management
  requirements (and local TM mechanisms) to be
  combined within a single federation execution
• DIS-style training simulations
• Simulations with hard real-time constraints
• Event-driven simulations
• Time-stepped simulations

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Simulation Specifications
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Multiple Federation Need

• Connection to Small and Medium Programs
• High Fidelity in Selected Areas of Interest
• Focused on Particular Problem Domain
• High Fidelity Simulations Within That Domain
• Developed in Small Quantities
• Large Scale Simulations Providing Experimental
  Context
• Often Operated in Joint Experiments With Other
  RDE Centers

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RDE Constraints

• Experiment Costs
• Initial Simulation Development Costs
• HLA Training, Infrastructure Costs
• Internal Small Scale Experiment Costs
• External Large Scale Experiment Costs
• Sustaining Engineering Costs
• Quickly and Easily Extend or Add New FOMs
• Common Infrastructure Should Promote Reuse
• Fidelity in Areas of Interest

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Object Management Techniques

• The RTI supports two approaches to transferring
  attribute ownership
• To add a new capability to an existing baseline
  federate use the push approach
• The choice of an approach when it comes to
  enhancing an existing capability requires a
  method of quantifying fidelity

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Time Management

• Explicitly managing time within distributed
  simulations or federations has been ignored by
  large segment of simulation community
• As federations grow by adding federates through
  new development or migration, time management
  will become a necessity
• HLA Time Management services provide a flexible,
  robust means to coordinate events between
  federates