ascentis: planetary ascent vehicle fes tooltrajectory.estec.esa.int/astro/3rd-astro-workshop... ·...
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ASTRIUMSpace Transportation
ASCENTIS: Planetary Ascent
Vehicle FES Tool
Eugénio Ferreira, Thierry Jean-Marius
ASTRIUM Space Transportation
Mission analysis & GNC teams
3rd International Workshop on Astrodynamics Tools and TechniquesESTEC, 4 October 2006
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationOutline
• Simulation Tool objectives
• Architecture and models
• Simulator usage
• Simulation outcomes
• Conclusion
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationASCENTIS objectives
• Developed within ESA TRP “PAV GNC”in partnership with Scisys
• Assess concept performances during ascent
– GNC algorithms integrated in closed loop
– Validation of GNC architecture & coupling effects
• 6-dof Non Real Time platform, built on Matlab/Simulink
– Representative: involves deviations on both vehicle & environment
– Operating modes: unitary cases / Monte-Carlo analysis
– Modular and expandable, Graphical User Interface
• Based on ATPE framework
– Compatible with Real Time environment, existing Library modules used
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationConsidered Missions & Vehicles
• Mars ascent phase, up to circular orbit
– 3 boosted phases
– 1 long coasting phase, before circularisation
– Mars Sample Return
· 500 km circular orbit
· 2-stages, liquid
– Mars Manned Mission
· 15 000 km circular orbit
· 1½-stage, liquid
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationTop Level Architecture of the FES
GNC
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationFES models – Spacecraft
• Propulsion
– Engine Management
– Attitude Control System
– Thrust Vector Control
• Aerodynamics
– Each stage modelled
• Mass and Inertia Evolution
– Centring and Inertia
– Fuel Sloshing
– Mass Evolution
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationFES models – Dynamics & Environment
• 6-dof Dynamics
– Translational Dynamics
– Rotational Dynamics
• Mars Gravity Model
– Simple 3rd order
– Complex nth order gravitational
harmonics based on JPL50c
• Mars atmosphere Model
– Look-up tables from EMCD 3.1
– EMCD 3.1 interface directly
embedded in FES
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationFES models – Sensors
• Inertial Measurement Unit
– 3-axis accelerometer
– 3-axis gyrometer
– Alignment Matrix
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationFES generic models management
• Ascent profile induces required dedicated management
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2-5 October 2006
ASTRIUMSpace TransportationFES models – GNC
• GNC algorithms
– Alignement/Navigation
· Inertial
· Coast arcs
– Ascent Guidance
trades-off
· Linear tg
· Pred-cor
· F(vel)
– Ascent Control
· Hinf
· LQG
· Eigen value placement
• C-coded S-functions
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3rd Intl Workshop onAstrodynamics Tools & Techniques
2-5 October 2006
ASTRIUMSpace TransportationGNC sequencing example
1st Stage2nd Stage
1st Boost 2nd Boost Coasting phase 3rd Boost Coasting phase
Navigation
Guidance
TVC control
Roll control
Attitude control
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2-5 October 2006
ASTRIUMSpace TransportationASCENTIS usage
• Two ways to run Simulator:
– Command Line
· Simple init., navigate to simulator directory &
edit set of scripts that manages simulation
· Plot and analyse results using command line
plotting functions
– GUI
· Manages scripts in one place
· Gives selections of mission
· Loads mission specific files editing
· User may execute simulations
· Status displayed in command window
· Default plotting at the touch of a button
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2-5 October 2006
ASTRIUMSpace TransportationFES use example: Guidance trade-off
• Algorithms comparison through performance index
1.7 m/s98.8%Explicit
66.7 m/s86.2%Predictor-corrector
48.2 m/s18.5%Implicit
95% value20 m/s
requirementGuidance scheme
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2-5 October 2006
ASTRIUMSpace TransportationASCENTIS plots
• Default plots run from single script
• Script manages plotting functions, additional plotting can be added if desired
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2-5 October 2006
ASTRIUMSpace Transportation
Orbital elements@ injection
+ GuidanceX Navigation
ASCENTIS plots: Monte-Carlo (1/2)
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2-5 October 2006
ASTRIUMSpace Transportation
Q.ααααenvelope
Deflectionenvelope
ASCENTIS plots: Monte-Carlo (2/2)
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2-5 October 2006
ASTRIUMSpace TransportationConclusion
• ASCENTIS is a standalone platform, compatible
with both UNIX & WINDOWS environments
• Fully tested and validated, and RT compliant
• Easy to use interface GUI or Command driven
• Useful platform to assess performances for aPlanetary ascent phase