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1www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.Copyright © ESI Group, 2019. All rights reserved.
www.esi-group.com
Scilab and Xcos for VLEO satellites modelling
David González, Deimos Satellite Systems
Scilab Conference 2019
2www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Discoverer
This project has received funding from the European
Union’s Horizon 2020 research and innovation programme
under grant agreement No 737183.
Web page: https://discoverer.space/
3www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Enabling technologies and developments
Discoverer
Low drag, atomic
oxygen resistant
materials
Aerodynamic attitude
and orbit control
Atmosphere breathing
electric propulsion
Modelling of
aerodynamic surfaces
Very Low Earth Orbit
Satellite Concepts
4www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
VLEO
Benefits
• Improved payload performance
• Improved launch vehicle payload mass
• Reduced space debris collision risk
• End-of-life disposal
Challenges
• Increased atmospheric drag
• Increased atomic oxygen erosion
• Shorter communications windows with ground stations
• Free molecular flow
Very Low Earth Orbit
O
He
N2 O2
5www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Feather and shuttlecock
Geometries
FeatherShuttlecock
6www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Xcos model
7www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Attitude stabilization (Feather)
VLEO Orbit: altitude 350km, inclination 50°, agument of perigee 90°, mltan 12h, eccentricity 0.001
8www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Yaw and pitch
Pointing maneuvers (Feather)
Accommodation
coefficient
Settling time (s) Overshoot (%)
0 4281 32.73
0.2 5426 32.86
0.4 9022 33.01
0.6 22513 33.13
0.8 68319 36.06
0.95 - -
• Accommodation coefficient (σ)
9www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Attitude stabilization Shuttlecock
10www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Feather and shuttlecock comparison
Pointing maneuvers
Feather Shuttlecock
Pointing Angle Settling Time Overshoot(%) Settling Time Overshoot(%)
5 3523 37.8 253 79.3
10 3271 35.7 261 77.8
15 4116 29.5 272 73.7
20 - - 279 69.1
25 - - 312 62.1
30 - - 433 51.5
35 - - 673 42.1
40 - - - -
11www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Toolbox
12www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Comparison LEO – VLEO (DTM2013)
Toolbox examples
13www.esi-group.com
Copyright © ESI Group, 2019. All rights reserved.
Thank you

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Scilab and Xcos for Very Low Earth Orbits satellites modelling

  • 1. 1www.esi-group.com Copyright © ESI Group, 2019. All rights reserved.Copyright © ESI Group, 2019. All rights reserved. www.esi-group.com Scilab and Xcos for VLEO satellites modelling David González, Deimos Satellite Systems Scilab Conference 2019
  • 2. 2www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Discoverer This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 737183. Web page: https://discoverer.space/
  • 3. 3www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Enabling technologies and developments Discoverer Low drag, atomic oxygen resistant materials Aerodynamic attitude and orbit control Atmosphere breathing electric propulsion Modelling of aerodynamic surfaces Very Low Earth Orbit Satellite Concepts
  • 4. 4www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. VLEO Benefits • Improved payload performance • Improved launch vehicle payload mass • Reduced space debris collision risk • End-of-life disposal Challenges • Increased atmospheric drag • Increased atomic oxygen erosion • Shorter communications windows with ground stations • Free molecular flow Very Low Earth Orbit O He N2 O2
  • 5. 5www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Feather and shuttlecock Geometries FeatherShuttlecock
  • 6. 6www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Xcos model
  • 7. 7www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Attitude stabilization (Feather) VLEO Orbit: altitude 350km, inclination 50°, agument of perigee 90°, mltan 12h, eccentricity 0.001
  • 8. 8www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Yaw and pitch Pointing maneuvers (Feather) Accommodation coefficient Settling time (s) Overshoot (%) 0 4281 32.73 0.2 5426 32.86 0.4 9022 33.01 0.6 22513 33.13 0.8 68319 36.06 0.95 - - • Accommodation coefficient (σ)
  • 9. 9www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Attitude stabilization Shuttlecock
  • 10. 10www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Feather and shuttlecock comparison Pointing maneuvers Feather Shuttlecock Pointing Angle Settling Time Overshoot(%) Settling Time Overshoot(%) 5 3523 37.8 253 79.3 10 3271 35.7 261 77.8 15 4116 29.5 272 73.7 20 - - 279 69.1 25 - - 312 62.1 30 - - 433 51.5 35 - - 673 42.1 40 - - - -
  • 11. 11www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Toolbox
  • 12. 12www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Comparison LEO – VLEO (DTM2013) Toolbox examples
  • 13. 13www.esi-group.com Copyright © ESI Group, 2019. All rights reserved. Thank you