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  • 1
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    An Overview of the Formation and Attitude Control System for the Terrestrial Planet Finder Formation Flying Interferometer (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The Terrestrial Planet Finder formation flying Interferometer (TPF-I) will be a five-spacecraft, precision formation operating near the second Sun-Earth Lagrange point. As part of technology development for TPF-I, a formation and attitude control system (FACS) is being developed that achieves the precision and functionality needed for the TPF-I formation and that will be demonstrated in a distributed, real-time simulation environment. In this paper we present an overview of FACS and discuss in detail its formation estimation, guidance and control architectures and algorithms. Since FACS is currently being integrated into a high-fidelity simulation environment, component simulations demonstrating algorithm performance are presented.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Proceedings from the 2nd International Symposium on Formation Flying Missions and Technologies; NASA/CP-2005-212781
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Best-Fit Conic Approximation of Spacecraft Trajectory (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A computer program calculates a best conic fit of a given spacecraft trajectory. Spacecraft trajectories are often propagated as conics onboard. The conic-section parameters as a result of the best-conic-fit are uplinked to computers aboard the spacecraft for use in updating predictions of the spacecraft trajectory for operational purposes. In the initial application for which this program was written, there is a requirement to fit a single conic section (necessitated by onboard memory constraints) accurate within 200 microradians to a sequence of positions measured over a 4.7-hour interval. The present program supplants a prior one that could not cover the interval with fewer than four successive conic sections. The present program is based on formulating the best-fit conic problem as a parameter-optimization problem and solving the problem numerically, on the ground, by use of a modified steepest-descent algorithm. For the purpose of this algorithm, optimization is defined as minimization of the maximum directional propagation error across the fit interval. In the specific initial application, the program generates a single 4.7-hour conic, the directional propagation of which is accurate to within 34 microradians easily exceeding the mission constraints by a wide margin.
    Keywords: Computer Programming and Software
    Type: NPO-40622. , NASA Tech Briefs, November 2005; 15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    On the Constrained Attitude Control Problem (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we consider various classes of constrained attitude control (CAC) problem in single and multiple spacecraft settings. After categorizing attitude constraints into four distinct types, we provide an overview of the existing approaches to this problem. We then proceed to further expand on a recent algorithmic approach to the CAC problem. The paper concludes with an example demonstrating the viability of the proposed algorithm for a multiple spacecraft constrained attitude reconfiguration scenario.
    Type: AIAA Guidance, Navigation and Control Conference; Aug 16, 2004; Providence, RI; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An Overview of the Formation and Attitude Control System for the Terrestrial Planet Finder Formation Flying Interferometer (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Terrestrial Planet Finder formation flying Interferometer (TPF-I) will be a five-spacecraft, precision formation operating near a Sun-Earth Lagrange point. As part of technology development for TPF-I, a formation and attitude control system (FACS) is being developed that achieves the precision and functionality associated with the TPF-I formation. This FACS will be demonstrated in a distributed, real-time simulation environment. In this paper we present an overview of the FACS and discuss in detail its constituent formation estimation, guidance and control architectures and algorithms. Since the FACS is currently being integrated into a high-fidelity simulation environment, component simulations demonstrating algorithm performance are presented.
    Keywords: Spacecraft Design, Testing and Performance
    Type: International Symposium on Formation Flying Missions and Technologies; Sep 14, 2004; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The Mars Science Laboratory EDL Mode Commander (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance
    Type: International Planetary Probe (IPPW-8) Workshop; Jun 06, 2011 - Jun 10, 2011; Norfolk, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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