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  • 1
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    A preliminary design of a drag-free satellite and its application to geodesy (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design of a drag-free satellite and its application to measuring tidal interaction of the earth and tesseral harmonics are discussed. Principle areas of discussion are: (1) the feasibility of making geophysical measurements which are not possible with conventional satellites, and (2) design of attitude and translation control systems for spinning vehicle and possible coupling of attitude and translation control for gravity stabilized vehicles.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-125606
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Error analysis of earth physics satellite systems (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Error analysis of distant-satellite-to-close-satellite range-rate, satellite-to-sea altimetry, and ground station to satellite range are made by simulations in which observational variances are assumed, observation equations are formed, and normal equations incremented. The final normal equation matrix is inverted to obtain standard deviations and correlation coefficients. The natural parameters solved for are the broad variations of the gravity field, represented by harmonic coefficients; local variations of gravity, represented by point masses; and the departure of the sea level from the geoid, represented by area means. A standard case of a low (263 km) polar close satellite, three equatorial geosynchronous satellites, and eight ground tracking stations is set up.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-130357
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    National Geodetic Satellite Program, Part II: University of California, Los Angeles (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Satellite orbit analyses are presented which were undertaken for: (1) reasons of insight and economy; (2) obtaining geophysically interesting tesseral harmonics; (3) comparing effects of tracking station location error drag, radiation pressure, and luni-solar attraction to tesseral harmonic effects; and (4) combination of satellite and terrestrial data. The analyses were divided into the following phases: (1) MINITRACK interferometry; early Baker-Nunn camera directions; (2) late Baker-Nunn camera directions; and (3) combined Baker-Nunn camera and TRANET Doppler data.
    Keywords: Geophysics
    Type: National Geodetic Satellite Program, Part II: A Report Compiled and Edited for NASA by the AGU; 943-948
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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