Transcript STK User's Conference
NASA Space Internet Workshop End-to-End Network Modeling Using Terrestrial, Wireless and Satellite Components Ray Williams - TASC
7 June 2004
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End-To-End Architecture/Model Methodology
Data Discovery, Storage, Manipulation and Modeling Develop Complex End-to-End Architectures in Minutes Model and Analyze the Complete Environment
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Terrestrial
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Wireless
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Satellite Analysis and Visualization To Accurately Depict Relationships and Performance
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Satellite Tool Kit – Orbital Dynamics with Superior Interactivity
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Integrated C4ISR Views with Popkin System Architect
Architecture, Requirements and Schedule GIS Tools/Methods and Associated Layers
Day/Night Shading DTED and VMAP Terrain Data Discrete Event Network Modeling Tools
Network Simulator (ns-2) Opnet (IT Guru, Modeler) TASC
Data Discovery, Storage, Correlation/Transformation
Terrestrial
– Topology and Individual Host Data Obtained from nMap, nTop, Firewalk, Traceroute, tEthereal traces, Circuit Databases, …
Wireless
– – – RF Point-to-Point, Area Coverage Obtained from CSPT, Others RF Survey Data From Kismet, GPSMap, GPSD, … Laser Through NWP-ARPS Extensions
Satellite
– Orbital Parameters Taken from Two-Line-Element (TLEs), STK Import, …
Requirements
– Import of Customer Requirements Documents, DOORS, RequisitePro, AP233
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Terrestrial
Based on TCP/IP V4/6 LAN and WAN Links Object Based-Extendable TASC
Wireless
Point-to-Point Line-of-Sight RF and Laser Communications Links Object-Based Extendable TASC
Satellite
Anything You Can Do In STK, I Can Import By Using STK We Can Focus On The Communications Interface Is Object-Based Extendable TASC
STK As A Compute Engine
STK with it's Connect and Coverage Modules is Invaluable for Incorporating Satellite Objects into Network Scenarios – Architecture Components Exported to STK via Connect – STK is Commanded to Compute Coverage Times and – Orbital Positions STK Returns Values That Are Stored in a File That is Parsed Using Perl And Those Events Are Inserted into Time-Based Scenario File for Execution
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Our Automated Process
Cellular 802.11
IP Hosts Routes
Network Simulator End-to-End Model Framework Integrated Statistical Analysis Opnet Satellite Tool Kit TASC
Alternate Data Uses
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Model Inter-Relationships
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Issues With the Airborne/Space Link
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Variability in Wireless/Space Communications
Figure 1 LEO-TRDSS RF Link Signal Strength
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Weather Models
Simulation Modeling “Engines”
1. Spacecraft 2. Orbital & Geolocation 5. Meteorological & Propagation 3. Ground Station 4. RF Spectrum 5. Weather Interference (3 Distinct Thunderstorms ~12 Miles in Height)
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Integrated Model Output
1. Start of Network 2. Iridium 13 in Sight - Seattle to Washington Traffic Re-Routing 3. Iridium 13 - Out of Sight San Diego to Norfolk Traffic Routed Over Ground 4. No Satellite links up
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Acknowledgements
Briefing is Based on the Paper Presented at the 2004 Society of Optical Engineers Conference (SPIE.org) at Orlando, FLA “End-to-End Network Models Encompassing Satellite, Terrestrial and Wireless Components” Majority of Screenshots Acquired From The TASC Rapid Architecture Development and Evaluation System (TRADES)
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