1. SATLINK TOOL A TOOL FOR ANALYSING GEO SATCOM
Authors: Ederson Ribas Machado and Anna Serra Font
Supervisor: Laurent Franck
Project 3
Space Communication Systems
Master & 3rd year program at ISAE
26th March 2015

2. CONTENTS Introduction Link Budget Analysis LabVIEW
App development overview
Plan
Graphical User Interface
Final design
Tabs functionalities
Tests and results
SATLINK Tool Demonstration
Conclusions
SATLINK Tool - MACHADO, SERRA

3. SATLINK Tool Introduction Objective: LINK BUDGET
The global analysis of a GEO SATCOM depends on many different parameters:
Position of satellite and Earth stations
Environment
Payload
Digital link
etc.
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
SATLINK Tool - MACHADO, SERRA

4. Link Budget Analysis Main Parameters 4 BER, Eb/No EIRP G/T 𝐶 𝑁
Accounting of loss and gains in the signal path.
Main Parameters
BER, Eb/No
EIRP
G/T
𝐶 𝑁 4
SATLINK Tool - MACHADO, SERRA

5. LabVIEW 5 Why is interesting to use this tool for link budget?
Two solutions : calculating and interface
Source: SatLinktool application©
Source: SatLinktool Application© 5
SATLINK Tool - MACHADO, SERRA

6. App development overview
Plan
SATLINK Tool - MACHADO, SERRA

7. Graphical User Interface
Final design of the GUI
1) Service
2) System Geometry
3) Uplink
4) Payload
5) Downlink
6) Overall link
SATLINK Tool - MACHADO, SERRA

8. Tabs functionalities Service Run Press to show the Help pop-up
Press to attach the corresponding files
Enter the input parameters / drop down menus
Results
Control Buttons
SATLINK Tool - MACHADO, SERRA

9. Tabs functionalities
System Geometry
SATLINK Tool - MACHADO, SERRA

10. Tabs functionalities
Uplink
SATLINK Tool - MACHADO, SERRA

11. Tabs functionalities Payload Mode indicator Enter with IBO Results
Press to select tab
SATLINK Tool - MACHADO, SERRA

12. Figures and diagrams to help the user
Tabs functionalities
Downlink
Figures and diagrams to help the user
SATLINK Tool - MACHADO, SERRA

13. Tabs functionalities Overall Link Help box Input (C/N)I
SATLINK Tool - MACHADO, SERRA

14. Tests and Results Service/Uplink/Downlink/Payload - Antenna
Use of “Satellite Communications Systems” book [1]. examples . Direct application of formulas.
[sections: 5.4.2, 5.4.3 , , 5.6.4, 5.7.4,].
System Geometry
Source: SatLinktool Application©
Source: Eutelsat:
SATLINK Tool - MACHADO, SERRA
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009

15. Tests and Results Payload
Antenna: Satellite – Earth station Geometry angles. β , α, β*, α*, θ, and ϕ (examples ref.[1]).
SATLINK Tool - MACHADO, SERRA
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009

16. Tests and Results Payload Single Carrier Multi Carrier
Transponder: Single and Multicarrier (3 Carriers/ Transponder). Direct application of the formulas, checked with Matlab scripts.
Single Carrier
Multi Carrier
SATLINK Tool - MACHADO, SERRA
[1] Maral, Gérald / Bousquet, Michel. Satellite Communication System.-5th ed. UK, 2009

17. SATLINK Tool Demonstration
SATLINK Tool - MACHADO, SERRA

18. 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 18
SATLINK Tool - MACHADO, SERRA

19. Improvements 19 BER Payload models Automate Data acquisition
Source: SatLinktool models©
BER
Source: Comets sat :
Source:
Payload models
Source: From [FEN-95] – Eutelsat and CCIR Rep 720–2
Automate
Data acquisition
Total depointing angle 19
SATLINK Tool - MACHADO, SERRA

20. Thanks for your attention!
Any questions?
SATLINK Tool - MACHADO, SERRA