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  • GEOPHYSICS  (3)
  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (1)
  • 1
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    Large aperture high accuracy satellite laser tracking (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A satellite laser ranging station has been established in order to range both low and high earth-orbiting satellites with a few-mm accuracy; this entails precision pointing of a 15-ton, azimuth-elevation-mounted coude telescope. Because tracking is performed under open loop computer control with no feedback from laser returns, the initial acquisition data and the algorithms for orbit computation must be accurate enough to maintain the satellite within the narrow laser beam width. The system is currently being used to track the LAGEOS and STARLETTE satellites.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lidar technology measurements and technology: Report of panel (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Lidar is ready to make an important contribution to tropospheric chemistry research with a variety of spaceborne measurements that complement the measurements from passive instruments. Lidar can now be considered for near-term and far-term space missions dealing with a number of scientifically important issues in tropospheric chemistry. The evolution in the lidar missions from space are addressed and details of these missions are given. The laser availability for space missions based upon the technical data is assessed.
    Keywords: GEOPHYSICS
    Type: Space Opportunities for Tropospheric Chemistry Research; p 43-59
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Satellite Laser Ranging in the 1990s: Report of the 1994 Belmont Workshop (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An international network of 43 stations in 30 countries routinely collects satellite ranging data which is used to study the solid Earth and its interactions with the oceans, atmosphere, and Moon. Data products include centimeter accuracy site positions on a global scale, tectonic plate motions, regional crustal deformation, long wavelength gravity field and geoid, polar motion, and variations in the Earth's spin rate. By calibrating and providing precise orbits for spaceborne microwave altimeters, satellite laser ranging also enables global measurement of sea and ice surface topography, mean sea level, global ocean circulation, and short wavelength gravity fields and marine geoids. It provides tests of general relativity and a means or subnanosecond time transfer. This workshop was convened to define future roles and directions in satellite laser ranging.
    Keywords: GEOPHYSICS
    Type: NASA-CP-3283 , REPT-95B00003 , NAS 1.55:3283 , Feb 01, 1994 - Feb 02, 1994; Elkridge, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Geodynamics applications of spaceborne laser ranging (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The Geodynamics Laser Ranging System (GLRS) is a spaceborne laser ranging instrument being developoed by NASA as a facility instrument for the Earth Observing System (EOS). GLRS is to be used to study regional and local crustal movements. It is designed to make highly precise range measurements to retroreflector targets located in geophysically interesting sites. Using a two-color ranging scheme, absolute range accuracies of several mm are expected. Simulations based on this accuracy and the EOS orbital parameters show that length of the intersite baseline between retroreflectors can be determined to several mm accuracy at distances from a few km to several hundred km with several passes of GLRS range data collected over a few-day interval. Short-arc techniques are used to minimize the effects of gravity field and other force model uncertainties. Relative heights can be determined to sub-cm accuracy over comparable distances.
    Keywords: GEOPHYSICS
    Type: Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing; Jan 16, 1989 - Jan 18, 1989; Los Angeles, CA; United States
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    NASA TECHNICAL REPORTS
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