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    Streamlining the Design Tradespace for Earth Imaging Constellations (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Distributed Spacecraft Missions (DSMs) are gaining momentum in their application to Earth Observation (EO) missions owing to their unique ability to increase observation sampling in spatial, spectral, angular and temporal dimensions simultaneously. DSM design includes a much larger number of variables than its monolithic counterpart, therefore, Model-Based Systems Engineering (MBSE) has been often used for preliminary mission concept designs, to understand the trade-offs and interdependencies among the variables. MBSE models are complex because the various objectives a DSM is expected to achieve are almost always conflicting, non-linear and rarely analytical. NASA Goddard Space Flight Center is developing a pre-Phase A tool called "Trade-space Analysis Tool for Constellations" (TAT-C) to initiate constellation mission design. The tool will allow users to explore the tradespace between various performance, cost and risk metrics (as a function of their science mission) and select Pareto optimal architectures that meet their requirements. This paper focuses on the tradespace search and how it can be streamlined by combining physical rules, as well as well-designed orbit and coverage computations, thus yielding significant speed-ups. Two use cases are shown as representative examples of the utility of TAT-C generated trades, and results are preliminarily validated against AGI's Systems Tool Kit.
    Keywords: Astrophysics; Computer Programming and Software
    Type: GSFC-E-DAA-TN34921 , AIAA Space 2016; Sep 13, 2016 - Sep 16, 2016; Long Beach, CA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    The General Mission Analysis Tool (GMAT): Current Features And Adding Custom Functionality (2010)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The General Mission Analysis Tool (GMAT) is a software system for trajectory optimization, mission analysis, trajectory estimation, and prediction developed by NASA, the Air Force Research Lab, and private industry. GMAT's design and implementation are based on four basic principles: open source visibility for both the source code and design documentation; platform independence; modular design; and user extensibility. The system, released under the NASA Open Source Agreement, runs on Windows, Mac and Linux. User extensions, loaded at run time, have been built for optimization, trajectory visualization, force model extension, and estimation, by parties outside of GMAT's development group. The system has been used to optimize maneuvers for the Lunar Crater Observation and Sensing Satellite (LCROSS) and ARTEMIS missions and is being used for formation design and analysis for the Magnetospheric Multiscale Mission (MMS).
    Keywords: Computer Programming and Software; Astrodynamics
    Type: LEGNEW-OLDGSFC-GSFC-LN-1107 , International Conference on Astrodynamics Tools and Techniques (ICATT); May 03, 2010 - May 06, 2010; Madrid; Spain
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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