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Authors: Ederson Ribas Machado and Anna Serra Font
Supervisor: Laurent Franck
SATLINK TOOLA TOOL FOR ANALYSING GEO SATCOM
Project 3 Space Communication Systems
Master & 3rd year program at ISAE
26th March 2015
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2SATLINK Tool - MACHADO, SERRA
•Introduction•Link Budget Analysis•LabVIEW•App development overview• Plan• Graphical User Interface
Final design Tabs functionalities
• Tests and results•SATLINK Tool Demonstration•Conclusions
CONTENTS
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3SATLINK Tool - MACHADO, SERRA
•The global analysis of a GEO SATCOM depends on many different parameters:
▫Position of satellite and Earth stations▫Environment▫Payload▫Digital link▫etc.
Introduction
LINK BUDGET
Objective:• Create a comprehensive tool in LabVIEW that offers the ability to
test different satellite link and derive the end-to-end system performance.
SATLINK Tool
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Link Budget Analysis
•Main Parameters▫ BER, Eb/No▫ EIRP▫ G/T▫
4SATLINK Tool - MACHADO, SERRA
• Accounting of loss and gains in the signal path.
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LabVIEW• Why is interesting to use this tool for link budget?• Two solutions : calculating and interface
Source: SatLinktool application©
Source: SatLinktool Application©
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6SATLINK Tool - MACHADO, SERRA
App development overview
•Plan
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7SATLINK Tool - MACHADO, SERRA
•Final design of the GUIGraphical User Interface
1) Service 2) System Geometry 3) Uplink
4) Payload 5) Downlink 6) Overall link
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Results
SATLINK Tool - MACHADO, SERRA
•ServiceTabs functionalities
Run
Press to attach the corresponding files
Enter the input parameters / drop down menus
Press to show the Help pop-up
Control Buttons
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9SATLINK Tool - MACHADO, SERRA
•System GeometryTabs functionalities
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10SATLINK Tool - MACHADO, SERRA
Tabs functionalities•Uplink
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11SATLINK Tool - MACHADO, SERRA
•Payload
Tabs functionalities
Press to select tab
Enter with IBO
Results
Mode indicator
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12SATLINK Tool - MACHADO, SERRA
•Downlink
Tabs functionalities
Figures and diagrams to help
the user
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13SATLINK Tool - MACHADO, SERRA
•Overall Link
Tabs functionalities
Help box
Input (C/N)I
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• Service/Uplink/Downlink/Payload - Antenna▫ Use of “Satellite Communications Systems” book [1]. examples . Direct application of formulas.[sections: 5.4.2, 5.4.3 , 5.6.3., 5.6.4, 5.7.4,].
• System Geometry
Tests and Results
Source: Eutelsat:www.eutelsat.com/deploy_SorbamLight/pages/azimuthElevation Source: SatLinktool Application©
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009SATLINK Tool - MACHADO, SERRA
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• Payload▫ Antenna: Satellite – Earth station Geometry angles. β , α, β*, α*, θ, and ϕ (examples ref.[1]).
Tests and Results
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009SATLINK Tool - MACHADO, SERRA
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• Payload▫ Transponder: Single and Multicarrier (3 Carriers/ Transponder). Direct application of the formulas,
checked with Matlab scripts.
Tests and Results
Single Carrier Multi Carrier
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009SATLINK Tool - MACHADO, SERRA
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SATLINK ToolDemonstration
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Conclusion
•Understanding Link Budget analysis
▫Feasibility approach
• Integration Computing (LabVIEW, matlab, class theory)
▫Improve skills: programming (labVIEW – loops , elements, not line of codes),
Matlab, associating concepts seen in classes. Theory
•Further improvements
▫ Increase the possible values of BER
▫Automate the process to take values of graphs
▫Additional computing: Complete total depointing angle computation
▫More options payload
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Source: SatLinktool models©
BER
Improvements
Source: From [FEN-95] – Eutelsat and CCIR Rep 720–2
AutomateData acquisition
Total depointing angle
Source: Comets sat : http://www.wtec.org/loyola/satcom/c6_s2.htm
Source: http://fas.org/spp/military/program/com/dscs_3.htm
Payload models
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Thanks for your attention!
Any questions?
SATLINK Tool - MACHADO, SERRA