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  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (4)
  • 1
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    Satellite laser ranging work at the Goddard Space Flight Center (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The paper describes the satellite laser ranging system at the Goddard Space Flight Center, its range and accuracy capabilities, and planned improvements for future systems. Major subsystems are described, including the laser, optical/mechanical, receiver, computer/software, timing, and laser data preprocessing subsystems. Operational considerations are examined, with attention given the mobile station layout, manpower requirements, and transportability. System performance is considered, with emphasis on system accuracy (calibration, stability, clock synchronization, atmospheric propagation correction) and range capability.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Western Electronic Show and Convention; Sep 16, 1975 - Sep 19, 1975; San Francisco, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Progress in laser ranging to satellites - Achievements and plans (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Theoretical and mathematical considerations involved in the design of retroreflectors for the GEOS-C and Timation III laser ranging satellites are described, laser ranging systems used by the Goddard Space Flight Center are reviewed, and planned systems changes are outlined. Equations are derived for the design of a cube corner array on a gravity gradient stabilized satellite in a circular orbit, and the required cube corner for GEOS-C is computed. Use of fixed threshold triggers and electronic and analytic pulse height compensation in present laser ranging systems is discussed. Proposed changes are outlined, including the incorporation of split gate triggers and trackers into the ranging systems and the use of analog and digital centroid measurement techniques. A theoretical consideration of the effects of velocity aberration on the reflected light beam is appended.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The use of artificial satellites for geodesy and geodynamics; International Symposium; May 14, 1973 - May 21, 1973; Athens; Greece
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Satellite laser ranging work at the Goddard Space Flight Center (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The pulsed-laser satellite ranging systems presently being operated by the Goddard Space Flight Center are described along with their range and accuracy capabilities. The major subsystems are outlined, operation of the fixed system and the two mobile systems is discussed, and the performance of all three systems is evaluated. It is noted that these systems have an accuracy of better than 10 cm on a carefully surveyed range as well as in regular satellite ranging operations and are capable of ranging to all currently launched retroreflector-equipped satellites with the exception of Timation III. Future improvements discussed include a third mobile system which will be able to range distant satellites, such as Timation III, with an accuracy of better than 5 cm and the use of a frequency-doubled Nd:YAG laser in place of the ruby lasers now being employed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Laser tracking instrumentation; Aug 11, 1975 - Aug 16, 1975; Prague; Czechoslovakia
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Performance and modeling of the GSFC pointing acquisition and tracking system for laser communications (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: In this paper the NASA Goddard Space Flight Center (GSFC) laser communication pointing, acquisition, and tracking laboratory demonstration program is discussed. This program entails the construction of a flexible brass-board simulation tool, and a supporting computer simulation effort. The result of this program will be a viable test bed to support the design and specification of space-based laser communication terminals and, additionally, to address critical performance issues such as tracking robustness in the presence of background (e.g., stellar or earth) noise and/or internally generated thermal noise.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Space Sensing, Communications, and Networking; Jan 16, 1989 - Jan 18, 1989; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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