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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
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    NASA TECHNICAL REPORTS
  • 2
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    A gravitational kinetic theory for planetesimals (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analytical theory is developed for the velocity evolution of nonaccreting planetesimal populations, based on the Boltzmann and Fokker-Planck equations. Adapting Shkarofsky's calculation of plasma viscosities, the rate of increase in random velocities due to gravitational encounters between planetesimals of equal mass is found to be one-third to one-half Safronov's result. Comparison with Wetherill's numerical experiments suggests that the Fokker-Planck equation underestimates the effectiveness of encounters and that Safronov's value is approximately correct. For populations of nonuniform sizes, the Fokker-Planck equation indicates an efficient redistribution of energy from the largest bodies to the smaller ones. By conserving angular momentum, the rate of radial spreading of orbits is also derived.
    Keywords: ASTRONOMY
    Type: Icarus; 44; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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