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  • 1
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    MIDCOURSE GUIDANCE USING RADIO TECHNIQUES (1962)
    In:  CASI
    Details
    Publication Date: 2012-03-16
    Description: Midcourse guidance using radio techniques
    Keywords: ELECTRONIC EQUIPMENT
    Type: ARS PAPER-2462-62
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    NASA TECHNICAL REPORTS
  • 2
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    Seasat-A opens new phase in earth observations (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The data output of the Seasat-A, the first satellite designed specifically for oceanographic observation, is described. Wave height and direction, ice distribution, surface wind speed and direction, ocean-surface temperature, and atmospheric water content will be monitored by the satellite. Imaging radar, microwave scatterometer, microwave radiometer and visual and infrared radiometer experiments are included in the Seasat-A observing program. Two types of orbits have been developed: a near-repeat cycle of three days, and a near-repeat cycle of 25 days. Both orbit types offer fine coverage (18.5 km crossing separations) of the earth. Synthetic aperture radar data on computer-compatible tapes and geophysical data records available through the Seasat-A mission are described.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Astronautics and Aeronautics; 16; June 197
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    NASA TECHNICAL REPORTS
  • 3
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    A Fully Integrated Micro-Magnometer/Microspacecraft for Multipoint Measurements: The Free-Flyer Magnometer (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: In the decades since the advent of in situ plasma measurements on board spacecraft, the instrumentation has grown bigger, heavier, and more complex as our understanding of space plasmas improves and our appetite for more information increases...There has thus been a recent interest in the miniaturization of both spacecraft and the instrument payload... This paper describes the results and status of an ongoing design study to understand the problems and trade space of fully integrating an instrument into a micro-spacecraft.
    Keywords: Plasma Physics
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    NASA TECHNICAL REPORTS
  • 4
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    Trajectory analysis of a 1970 mission to mercury via a close encounter with venus. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Unmanned spacecraft trajectory and guidance considerations for close flyby of planet Mercury
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 65-90
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    NASA TECHNICAL REPORTS
  • 5
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    MIDCOURSE GUIDANCE USING RADIO TECHNIQUES (1963)
    In:  Other Sources
    Details
    Publication Date: 2019-05-10
    Description: Earth-based radio command of midcourse guidance for lunar flights is described, noting spacecraft, tracking station, and computing facility requirements
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 6
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    Trajectory analysis of a 1970 mission to Mercury via a close encounter with Venus. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Unmanned spacecraft trajectory and guidance considerations for close flyby of planet Mercury
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 65-90 , /AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS
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    NASA TECHNICAL REPORTS
  • 7
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    The Venus Radar Mapper (VRM) mission (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Venus Radar Mapper (VRM) mission is sponsored by NASA to put a single spacecraft in orbit around Venus to map the surface of Venus using a synthetic aperture mapping radar. The spacecraft is scheduled to be launched in April 1988 using a Shuttle-Centaur G combination. The spacecraft arrives at Venus in late July 1988 and begins its mapping mission which lasts for one Venus rotation or 243 days. This paper describes the VRM mission at its present state of design. The science objectives and project constraints are described. Key features of the spacecraft system and radar system are discussed. The interplanetary and mapping orbit design are covered. Navigation strategy is explained, including trajectory maneuvers and mapping phase orbit determination. Finally, the mapping sequences to optimize planet coverage are described.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AIAA PAPER 84-0212
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    NASA TECHNICAL REPORTS
  • 8
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    Mission design for SEASAT-A, an oceanographic satellite (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: SEASAT-A is a NASA earth satellite for measuring global ocean dynamics from space. Launch is planned for May 1978. The instruments on the spacecraft will provide data on wave height and direction, surface wind speed and direction, ice fields, ocean surface topography and weather. This paper is concerned with the mission design for SEASAT-A. A primary topic here is the selection of the orbit which best satisfies the measurement objectives of the various instruments. The maintenance of this orbit under drag and other perturbations is discussed. The design of the mission profile is outlined. Finally precision orbit determination for SEASAT-A is discussed since it is required to maximize ocean topography accuracy.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: AIAA PAPER 77-31 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
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    NASA TECHNICAL REPORTS
  • 9
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    Orbit analysis for Seasat-A (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Seasat-A is a NASA earth satellite for measuring global ocean dynamics from space. The instruments on the spacecraft will provide data on wave height and direction, surface wind speed and direction, ice fields, ocean surface topography and atmospheric water content. This paper is concerned with the orbit analysis for Seasat-A. The first topic is the selection of the orbit which best satisfies the measurement objectives of the various instruments. The maintenance of this orbit under drag and other perturbations is also discussed. The second topic is precision orbit determination analysis which is required to achieve ocean topography objectives of the mission.
    Keywords: ASTRODYNAMICS
    Type: Journal of the Astronautical Sciences; 26; Oct
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  • 10
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    Flight path design issues for the TOPEX mission (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The proposed Ocean Topography Experiment (TOPEX) is an earth satellite mission currently under consideration by NASA. The primary purpose of the experiment is to determine the general circulation of the oceans and its variability. High precision, space based altimeter measurements will be combined with surface measurements and ocean models to accomplish the mission objectives. The paper will discuss mission requirements on orbit design, orbit selection space, derived requirements on navigation and satellite design issues which impact orbit selection. Unique aspects of the TOPEX orbit design are highlighted, such as high precision repeating orbits, 'frozen orbit' values of eccentricity and periapses, precise maneuver and orbit determination requirements and insuring crossing arcs over a calibration-site.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 83-0197 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 10, 1983 - Jan 13, 1983; Reno, NV
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    NASA TECHNICAL REPORTS
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