Astrodynamics tools in the ESTEC Concurrent Design Facility. Robin Biesbroek CDF Technical Assistant ESA/ESTEC Noordwijk - NL
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1 Astrodynamics tools in the ESTEC Concurrent Design Facility Robin Biesbroek CDF Technical Assistant ESA/ESTEC Noordwijk - NL CDF Astrodynamics CDF Presentation - 1
2 Introduction Concurrent Design Facility (CDF): ESA Mission Analysis, Conceptual design, pre-assessment studies & Industry reviews. Apply methods and tools of concurrent engineering Integrated Design Model (Excel Oracle) Strong focus on: Real-time results i.e. during design sessions Connectivity: linking to other tools, and Excel Variety: applications range from LEO to deep-space CDF is a facility We offer our users a set of astrodynamics tools The user is free to use these or not But: results imported into Excel to share with others CDF Astrodynamics CDF Presentation - 2
3 Overview of tools in the CDF Developed especially for the CDF: Swing-by Calculator (JAQAR Astrodynamics package) Commercially Off The Shelf: Microsoft Excel AGI s Satellite Tool Kit (STK) ESA developments IMAT and ORION (GMV) ASTOS (IFR) MASTER (eta_max, aerospace systems, QinetiQ) CDF Astrodynamics CDF Presentation - 3
4 JAQAR Astrodynamics package Consists of 6 software tools: Swing-by Calculator (SBC) Orbit Transfer Optimiser Tetsim tether simulator Orbit-parameters calculator STKephem LTO (Lunar Transfer Orbit) calculator Extra package for CDF: Events: coverage visualisation SBC & Events originally developed for the CDF LTO calculator for WSB transfers of LunarSat CDF Astrodynamics CDF Presentation - 4
5 Swing-by Calculator PC-based (Windows XP) Optimisation of interplanetary transfers Maximum 5 swing-bys Deep-space manoeuvres Low-thrust Aero-gravity assists Resonance orbits Launch windows 3 optimisers: Genetic Algorithm Systematic search Monte-Carlo CDF Astrodynamics CDF Presentation - 5
6 Swing-by Calculator (2) User-defined ephemeris (comets, asteroids) Orbit visualisation Launcher data-base Trajectory files Excel format STK format IMAT format Creates entire STK scenario numerical propagation G/S coverage Eclipse times CDF Astrodynamics CDF Presentation - 6
7 SBC Genetic Algorithm A contract was awarded by ESOC in 2003 to investigate genetic algorithm settings Mission to Pluto (via Venus & Mars) Cassini-Huygens Mission to Europa (Jovian Moon swing-bys) CDF Astrodynamics CDF Presentation - 7
8 SBC low thrust optimisation Low thrust parameters are the same as impulsive Deep-space manoeuvre B-plane parameters of previous swing-by Start-time SBC determines endtime Only finite thrust is propagated CDF Astrodynamics CDF Presentation - 8
9 Orbit Transfer Optimiser PC-based (Windows XP) Systematic search of 1/2/3 impulse transfer Plane change Node change Pericenter change Hyperbolic entry/exit Any planet Creates STK scenario numerical propagation G/S coverage Eclipse times Link to STK is done via HTML CDF Astrodynamics CDF Presentation - 9
10 LTO Calculator Currently optimisation of Weak-Stability Boundary (WSB) transfers Upgraded: Direct transfers Bi-elliptic STK interface CDF Astrodynamics CDF Presentation - 10
11 Events & STKephem Events: Creates daily event-patterns (G/S visibility, eclipse) from IMAT results 1 satellite to multiple G/S Multiple satellites to 1 G/S Result is bitmap & Excel output Portable to CDF final report & Excel STKephem Converts any trajectory file to STK format Freeware CDF Astrodynamics CDF Presentation - 11
12 Availability of JAQAR software JAQAR Astrodynamics Package can be downloaded from the internet Users of the Swing-by Calculator: ESA SSTL (Surrey Satellite Technology Ltd.) NASA Goddard spaceflight centre Other companies (demo-version) >100 students all over the world (student version) CDF Astrodynamics CDF Presentation - 12
13 Use of Excel for mission analysis A dedicated mission analysis Excel workbook has been developed Links inputs & outputs to other sub-systems Used for calculations, storage & presentations Contains >50 macros for calculations Launcher performance, Sun-synchronous orbits, repeating ground-track orbits, V & propellant Data-base sheets Import trajectory files from IMAT, SBC, STK and ASTOS CDF Astrodynamics CDF Presentation - 13
14 Excel Example Table of altitudes Macro gives performance Macro gives dry mass in hyperbolic orbit Visualisation to find optimum apogee CDF Astrodynamics CDF Presentation - 14
15 STK in the CDF Used for: orbit transfer 3D representation Understanding for the team Verification of orbit Movies G/S coverage Eclipse times GNC/AOCS Parameter evaluation User-defined CDF Astrodynamics CDF Presentation - 15
16 STK CDF connectivity SBC Excel HTML The future? OTO ESOC HTML interface CDF CDF Astrodynamics CDF Presentation - 16
17 IMAT Instrument Mission Analysis Tool Evaluate instrument return for planetary surface coverage Quick Assessment Orbit propagation Gravity loss/burn duration Auxiliary Calculations Eclipse times Ground-station visibility Planetary orbits only Developed by GMV, Spain CDF Astrodynamics CDF Presentation - 17
18 ORION Orbit Constellation Tool Constellation requirements and design Analysis of constellation performance Launch strategy and constellation set-up Launcher Database Corresponds to the CDF database in Excel Constellation orbit determination and maintenance Constellation replacement and end-of-life strategy Developed by GMV, Spain CDF Astrodynamics CDF Presentation - 18
19 ASTOS Aerospace Trajectory optimisation Software Used in preparation of & during projects Application to future launchers (Ariane 5 ECA/ECB) Optimisation of multi-phase problems based on PROMIS or TROPIC Applicable to atmospheric re-entry and aero-capture Creates STK trajectory/ attitude file Developed by IFR (Stuttgart), Germany CDF Astrodynamics CDF Presentation - 19
20 MASTER Meteoroid and Space Debris Terrestrial Environment Reference Model Characterization of the natural and the man-made particulate environment of the Earth Fast and simple evaluation of the resulting effects on space missions. semi-deterministic analysis of a reference population derived from the simulation of all major space debris source terms. Used to assess risk of debris impact Developed by eta_max, aerospace systems, QinetiQ CDF Astrodynamics CDF Presentation - 20
21 Conclusions CDF as a facility offers its users a set of Astrodynamics tools covering a wide field of applications Personal preference of users to use this set or not Strong focus on connectivity Future trend more and more important Successful results from mission analysis in all CDF studies Despite the fast track constraints CDF Astrodynamics CDF Presentation - 21
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