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  • 1
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    Lunar Reconnaissance Orbiter Mission and Spacecraft Design (2010)
    Springer
    Details
    Publication Date: 2010-01-01
    Print ISSN: 0038-6308
    Electronic ISSN: 1572-9672
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Venus 2000 Mission Design (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: As part of the Discovery Program, National Aeronautics and Space Administration (NASA) has solicited proposals for inter-planetary research to conduct solar system exploration science investigations. A mission, called Venus 2000 (V2k), has been proposed for exploration of the Venus Atmosphere. This is NASAs first voyage to Venus to investigate key science objectives since Magellan and will be launched in summer 2002. In keeping with discovery program requirements to reduce total mission cost and utilize new technology, V2k mission design and control will focus on the use of innovative and proven trajectory analysis programs and control systems provided by the Goddard Space Flight Center (GSFC).
    Keywords: Lunar and Planetary Exploration
    Type: Flight Mechanics Symposium 1997; 385-395; NASA-CP-3345
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Getting to L1 the Hard Way: Triana's Launch Options (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Over the past four years, NASA's Goddard Space Flight Center has built and tested the Triana observatory, which will be the first Earth observing science satellite to take advantage of the unique perspective offered by a Lissajous orbit about the first Earth-Sun Lagrange Point (L1). Triana was originally meant to fly on the U.S. Space Transportation System (a.k.a. the Space Shuttle but complications with the shuttle manifest have forced Triana into a 'wait and see' attitude. The observatory is currently being stored at NASA's Goddard Space Flight Center, where it waits for an appropriate launch opportunity to surface. To that end, several possible alternatives have been considered, including variations on the nominal shuttle deployment scenario, a high inclination Delta-type launch from Vandenberg Air Force Base, a Tsyklon class vehicle launched from Baikonur, Kazakhstan, and a ride on a French Ariane vehicle out of French Guiana into a somewhat arbitrary geostationary transfer orbit (GTO). This paper chronicles and outlines the pros and cons of how each of these opportunities could be used to send Triana on its way to L1.
    Keywords: Spacecraft Design, Testing and Performance
    Type: International Conference on Libration Point Orbits and Applications; Jun 10, 2002 - Jun 14, 2002; Gerona; Spain
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Controller Design for the ST7 Disturbance Reduction System (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Space Technology 7 experiment will perform an on-orbit system-level validation of two specific Disturbance Reduction System technologies: a gravitational reference sensor employing a free-floating test mass and a set of micro-Newton colloidal thrusters. The Disturbance Reduction System is designed to maintain a spacecraft's position with respect to the free-floating test mass to less than 10 nm/ square root of Hz, over the frequency range 10(exp -3) Hz to 10(exp -2) Hz. This paper presents the design and analysis of the coupled drag-free and attitude control system that closes the loop between the gravitational reference sensor and the micro-Newton thrusters while incorporating star tracker data at low frequencies. The effects of actuation and measurement noise and disturbances on the spacecraft and test masses are evaluated in a seven-degree-of-freedom planar model incorporating two translational and one rotational degrees of freedom for the spacecraft and two translational degrees of freedom for each test mass.
    Keywords: Astronautics (General)
    Type: 5th International ESA Conference on GN&C Systems; Oct 22, 2002 - Oct 25, 2002; Frascati; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Getting to L1 the Hard Way: Triana's Launch Options (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Over the past four years, NASA's Goddard Space Flight Center has built and tested the Triana observatory, which will be the first Earth observing science satellite to take advantage of the unique perspective offered by a Lissajous orbit about the first Earth-Sun Lagrange Point (L1). Triana was originally meant to fly on the U.S. Space Transportation System (a.k.a. the Space Shuttle), but complications with the shuttle manifest have forced Triana into a "wait and see" attitude. The observatory is currently being stored at NASA's Goddard Space Flight Center, where it waits for an appropriate launch opportunity to materialize. To that end, several possible alternatives have been considered, including variations on the nominal shuttle deployment scenario, a high inclination Delta-type launch from Vandenberg Air Force Base, a Tsyklon class vehicle launched from Baikonur, Kazakhstan, and a ride on a French Ariane vehicle out of French Guiana into a somewhat arbitrary geostationary transfer orbit (GTO). This paper chronicles and outlines the pros and cons of how each of these opportunities could be used to send Triana on its way to L1.
    Keywords: Astrodynamics
    Type: International Conference on Libration Point Orbits and Applications; Jun 10, 2002 - Jun 14, 2002; Gerona; Spain
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Using Sequential Earth Images to Determine the Orientation of a Satellite at L1 (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper introduces a method for determining the three-axis attitude (orientation) of a spacecraft from a sequence of Earth images taken while in orbit about the stationary Lagrange point between the Earth and the sun (LI). Two axes of information can be obtained simply by monitoring the Earth's position within the field-of-view of the camera. The third axis is obtained by correlating sequential Earth images in such a way as to detect the flow of the features within the Earth's disk over time. When taken correctly, this measurement is perpendicular to the Earth's spin axis and, consequently, locates the Earth's spin axis within the images. This is equivalent to determining the orientation of the spacecraft about the instrument's boresight. Actual data from the Galileo spacecraft is used to test the algorithms outlined in this paper.
    Keywords: Astrodynamics
    Type: Signal and Image Processing; Oct 27, 1998 - Oct 31, 1998; Las Vegas, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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