Real Time Simulations Using

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Real Time Simulations Using HLA on the Windows NT
PlatformCapt Kenneth W. Stauffer John M.
Woodyard AFRL/IFSC kenneth.stauffer_at_wpafb.af.mil j
ohn.woodyard_at_wpafb.af.mil
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Objective

• Develop and Demonstrate a Real-time Windows NT
  Pilot-in-the-loop/Hardware-in-the-loop simulation
  capable of long-haul HLA communication
• Link multiple Distributed Players using HLA in a
  synthetic battle-space.
• Measure Simulation and HLA Performance

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Technical Approach

• Choose Simulation System- Reconfigureable
  Avionics Modeling and Simulation System (RAMSS)
• Choose method of communication (HLA)
• RTI1.3V6 RTI1.3NG
• RPR-FOM
• Integrate HLA into Simulation System
• Show Proof of Concept
• Measure Performance

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Overview

• AFRL/IFSC (Integrated Test Bed)
• Who we are / What we do
• Simulation System Utilized (software)
• Hardware used
• Configuration of Lab
• HLA Server Application
• Testing /Results
• Conclusion

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Integrated Test Bed

• INTEGRATED TEST BED VISION Conduct information
  and weapons system research, development, virtual
  prototyping, and proof-of-concept demonstrations
  utilizing a virtual pilot-in-the-loop and
  hardware-in-the-loop distributed synthetic
  battlespace simulation.

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Integrated Test Bed Virtual Avionics Prototyping
Multi-Player / Distributed Simulation
Desktop Simulation Technology (ITB System Upgrade
-- RAMSS) - Development Tools
Weapon System Components Technology
System Design/Development - S/W Development -
H/W Breadboard
Final Development System Integration - H/W-S/W
Integration - HIL/PIL Test - Flight Test
Preparation
Concept Development
HLA
System Test Evaluation - Real/Virtual World
Flight Test
System Refinement TE - Virtual World Flight Test
Real-Time Simulation Technology - Networked
Simulation
Technology System Design for EMD/Production
Program
RAMSS - Reconfigurable Avionics Modeling and
Simulation Station
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Real World Environment
Develop, test, and evaluate weapons systems in
the context of the real-world environment
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Simulation Environment

• Avionics Simulation
• SIMPAC (Simulation Tool)
• Head Down Displays
• A-10
• F-22
• Out The Window Views
• Hardware Used
• Configuration of Hardware

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AVIONICS MODELS

• A-10, F15, C130 (Control and Aero Models)
• Digital Communications Output
• Air Data Computer
• Internal Navigation Unit
• Radar Altimeter
• Laser Ranger
• Weapon Delivery/Stores Management
• Operational Flight Program (MIL-STD-1553)

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Reconfigurable Avionics Modeling and Simulation
System Modular
Extendibility
Multi-CPU, Extendable System Robust Model
Set Extended Analysis Tools Crew -Station
Interfaces Flight Processor Interfaces HLA Capable
. . .
Simulation Cluster
Development Station
Wing-Station
Dev, Test, Evaluation Tools RT Simulation
Env OFP Support Analysis Tools Selected I/O
Model Set Simple Stick/Throttle
Out-the-Window/Sensor Sim Multiple
Displays Robust Model Set System Control
Interface Robust Stick/Throttle (F-22 style) HLA
Capable
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Wing station Hardware

• Dual Pentium II Xenon 450MHz
• 384MB Memory
• Enhanced Obsidian Graphics Card
• Dual 10/100 Mbs Ethernet card
• Condor MIL-STD 1553 Avionics bus
• F-22 Throttle and Stick

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Simulation Cluster Hardware

• 2 HP Netserver LPr
• Dual 450MHz Pentium II Xenon
• 384MB Memory
• HP Netserver LC3
• Dual 450MHz Pentium II Xenon
• 384MB Memory
• Connects to Generic Cockpit
• Sends position to Evans Sutherland 3000

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ITB Network Configuration
Military Cluster
System Simulation Cluster
Mil-Std 1553B
Mil-Std 1553B
HUB
100 Mbs
100 Mbs
Ethernet
Ethernet
Development Stations
Wing stations
Remote Connection
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Multi-player HLA Link Distributed Real-time
Simulation
HLA
Simulation Cluster
Wing Stations
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HLA Server
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Supported Attributes

• HLAServer must publish and subscribe to
• Attributes (RPR-FOM Base Entity Class)
• Position (Earth Centered Earth Fixed) ECEF
• Orientation Angular Velocity
• Velocity Acceleration
• EntityType Entity ID
• DeadReckoning Is Frozen

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Supported Interactions

• Start/Resume
• Stop/Freeze
• Collision
• Weapon Fire
• Munition Detonate

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SIMULATION LOOP

• RAMSS_UPDATE
• Get Simulation Values
• RAMSS_DEADRECK
• Perform Dead Reckoning
• RAMSS_BROADCAST
• Broadcast Own-ship data as required
• RAMSS_OTW
• Perform Out-The-Window Calculations
• RAMSS_TICK
• Tick The RTI (Receives other player information)

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RTI 1.3V6 Configuration

• RTIEXEC HOST
• auto_reldistr_config 1
• auto_discover_on 1
• netdev Local Ethernet IP
• tcp_netdev Local Ethernet IP
• reldistr_forced_discoveries Local Ethernet IP
• TCP_Bundling OFF

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RTI 1.3V6 Configuration

• RTIEXEC OTHERS
• auto_reldistr_config 0
• auto_discover_on 1
• netdev Local Ethernet IP
• tcp_netdev Local Ethernet IP
• reldistr_forced_discoveries RTIEXEC IP
• TCP_Bundling OFF

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RTI1.3NG Configuration

• Conversion from 1.3V6
• Include new files, dll and lib
• Compile no changes to HLA Server App
• Problems with multiple Ethernet cards
• Could not execute hello world between two
  machines
• New version released 13 Dec 1999
• Have not tested for Windows NT/multiple Ethernet
  card compatibility

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Testing

• Measurement tool used
• Ping Pong Test
• Results

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Measurement Tool
HLAServer/UpdateData
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• PONG
• Runs Open Loop

• PING
• Scheduled

2. Waits for/Catches Ball
1. Starts with ball/Sends Ball
3. Sends Ball
4. Waits for Ball/ Catches Ball
The Ball is the RPR-FOM Base Entity Class.
Catching Identifies receiving a known value in
VelocityX (1)
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Results

• Simulation loop takes 346us to execute
• Long haul test performed (Functionality)
• Used 56Kbs Breeze Box
• Actual through-put 21.8Kbs
• Wing Station in Ohio Communicated with Wing
  Station in California
• Need faster link for Real-time

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RESULTS 100Mbs Local
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Conclusions

• Real-time simulation shown on Windows NT Platform
• HLA implemented with Simulation System
• RTI1.3V6 RPR-FOM Successful
• RTI1.3NG Unsuccessful
• RTI1.3V6 Performance measured
• One Way trip of 7.8125ms on 100Mbs network
• Full Simulation with HLA uses 86 92 CPU
  Resources

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Where to go from here?

• Test 13 Dec release of RTI1.3NG with Windows NT
• Stress test the simulation using multiple players
  communicating via HLA
• Measure network performance of HLA VS number of
  players
• Help Integrate HLA into other AFRL LAB Simulation
  Facilities