nasa space internet workshop
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NASA Space Internet Workshop. End-to-End Network Modeling Using Terrestrial, Wireless and Satellite Components Ray Williams - TASC [email protected] 7 June 2004. End-To-End Architecture/Model Methodology. Data Discovery, Storage, Manipulation and Modeling - PowerPoint PPT PresentationTRANSCRIPT
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TASC
End-to-End Network Modeling Using Terrestrial, Wireless and Satellite Components
Ray Williams - TASC
7 June 2004
NASA Space Internet Workshop
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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
– Terrestrial– Wireless– Satellite
Analysis and Visualization To Accurately Depict Relationships and Performance
– Satellite Tool Kit – Orbital Dynamics with Superior Interactivity– 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)
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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
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Wireless
Point-to-Point Line-of-Sight RF and Laser Communications Links Object-Based Extendable
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Satellite
Anything You Can Do In STK, I Can Import By Using STK We Can Focus On The Communications Interface Is Object-Based Extendable
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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
STK As A Compute Engine
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Our Automated Process
Network Simulator
Opnet
End-to-EndModel
Framework
IntegratedStatisticalAnalysis
Satellite Tool Kit
Cellular
802.11
IP Hosts
Routes
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Alternate Data Uses
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Model Inter-Relationships
Physical Layer Simulation Engines1. Spacecraft Modeling (Matlab, SystemView, other COTS, proprietary)2. Orbital & Geolocation Modeling (STK, other COTS, proprietary)3. Terminal Modeling (Matlab, SystemView, other COTS, proprietary)4. RF Spectrum Modeling (Matlab, SystemView, other COTS, proprietary)5. RF and Optical Meteorological/Propagation Modeling
(various COTS and proprietary)
Network Simulation Engine
Seven-LayerOSI Model
ApplicationPresentationSessionTransportNetworkData LinkPhysical
User Interface
RF/Optical Link Budget
Physical Layer Simulation Engines1. Spacecraft Modeling (Matlab, SystemView, other COTS, proprietary)2. Orbital & Geolocation Modeling (STK, other COTS, proprietary)3. Terminal Modeling (Matlab, SystemView, other COTS, proprietary)4. RF Spectrum Modeling (Matlab, SystemView, other COTS, proprietary)5. RF and Optical Meteorological/Propagation Modeling
(various COTS and proprietary)
Network Simulation EngineNetwork Simulation Engine
Seven-LayerOSI Model
ApplicationPresentationSessionTransportNetworkData LinkPhysical
Seven-LayerOSI Model
ApplicationPresentationSessionTransportNetworkData LinkPhysical
ApplicationPresentationSessionTransportNetworkData LinkPhysical
User InterfaceUser Interface
RF/Optical Link BudgetRF/Optical Link Budget
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Issues With the Airborne/Space Link
Atmospheric Effects
Terrestrial Blockage &Propagation Effects
GEO 1 GEO 2
Fixed Terminal Mobile TerminalsTerrestrial Interference
Desired
Desired
Undesired
Space Weather &Ionospheric Effects
DesiredNGSO
Atmospheric Effects
Terrestrial Blockage &Propagation Effects
GEO 1 GEO 2
Fixed Terminal Mobile TerminalsTerrestrial Interference
Desired
Desired
Undesired
Space Weather &Ionospheric Effects
DesiredNGSO
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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. Spacecraft2. Orbital & Geolocation 5. Meteorological & Propagation3. Ground Station 4. RF Spectrum5. Weather Interference(3 Distinct Thunderstorms ~12 Miles in Height)
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Integrated Model Output1. 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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