Genaral Mission Analysis Tool.pdf

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Using the General Mission Analysis Tool (GMAT) Steven P. Hughes (NASA GSFC) Darrel J. Conway (Thinking Systems, Inc.) Portions of this presentation were written by members of the GMAT team and are used with their permission. NASA Goddard Space Flight Center https://ntrs.nasa.gov/search.jsp?R=20170001580 2018-03-29T14:11:05+00:00Z

Tutorial Overview • GMAT Basics (D. Conway) • Mission Design Walk-Through (S. Hughes) • GMAT Navigation Example (D. Conway) • CSALT Demo (S. Hughes) • Wrap-Up (S. Hughes) GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 2

Outline I. GMAT Overview II. Key Concepts Two Parallel Interfaces a. b. Resources and Commands c. d. Fields and Parameters Execution Model III. Tour of the Graphical User Interface a. GUI Controls b. Resources Tree c. Mission Tree d. Output Tree e. OrbitView IV. Tour of the Script Language a. Basic Syntax b. Control Structures c. Using Math d. Using Parameters e. Solvers f. g. Best Practices Script Editor V. A Quick Demo GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 3

GMAT OVERVIEW

GMAT Timeline • Design Started in 2002 • Development Began in early 2003 • Initial Fully Functional Build: 2004 • First Public Demonstration/Release: 2007 – Alpha/pre-Beta System – Used for Mission Design and Analysis • First Public Beta Release: R2011a • First Production Release: R2013a – First Operationally Ready Release – Target: The Advanced Composition Explorer (ACE) • Current Release: R2016a – First Production Ready Navigation Release – Target: The Solar and Heliospheric Observatory (SOHO) GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 5

System Features • Platforms Supported: Windows, Mac, Linux • External Interfaces: MATLAB and Python • Development Approach: Modified Open Source – Developed Behind a NASA Firewall – Periodic Public Releases of Builds and Code – Supports a Robust Plugin Framework • Extensively Tested – More that 13000 Core Code Tests Run Nightly – More that 3000 GUI Tests GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 6

Mission Design and Nav. Applications • Orbit design, optimization, and selection • Control design • Visualization • Orbit product generation and delivery • Event detection/prediction • Fuel bookkeeping & lifetime analysis • Propulsion system sizing • Launch window analysis • Sensitivity and Monte Carlo analysis • Navigation data simulation • Orbit determination • Maneuver planning and calibration • Maneuver Support and reconstruction • End-of-Life modelling • Ephemeris prediction GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 7

System Characteristics • World-class quality software – TRL 9, Class B, (Part of Center-wide CMMI Accreditation) – Over 16,000+ automated script and GUI tests • Large system with extensible design – – – – 540k C++ LOC Core Script, GUI, and plugin interfaces 2 Interfaces to external systems (MATLAB and Python (under development) 890k LOC from other libraries (SNOPT (Stanford Business Software). SPICE (JPL NAIF), Wx- Widgets, VF13ad (Harwell), TSPlot Plotting Package (Thinking Systems, Inc.), Mars-GRAM model (MSFC) • Enterprise level support – – – Large online support site (wiki, forums, issue tracker, downloads, etc) Extensive Documentation (~1000 page User Guide and Reference Manual and ~100 pages of step-by- step tutorials) Training (full-day live training courses and recorded training available via YouTube channel) GMAT Software Demonstration AAS Guidance and Control Conference, Feb. 7, 2017 8

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