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  • 1
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    Optimal perturbation models for averaged orbit generation (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Averaging techniques applied to the variation of parameters (VOP) formulation of the equations of motion are being investigated as methods for long-term prediction of artificial satellite orbits. Analytically averaged equations were compared with numerically averaged equations with respect to accuracy and efficiency for computation of zonal and nonresonant third-body perturbations. Numerically averaged equations were also evaluated for computation of long-period effects from resonant third-body, tesseral harmonic, and atmospheric drag perturbations. Guidelines will be presented for application of averaged VOP equations to a broad class of orbits.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 76-815 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of various experimental parameters on errors in triangulation solution of elongated object in space (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of various experimental parameters on the displacement errors in the triangulation solution of an elongated object in space due to pointing uncertainties in the lines of sight have been determined. These parameters were the number and location of observation stations, the object's location in latitude and longitude, and the spacing of the input data points on the azimuth-elevation image traces. The displacement errors due to uncertainties in the coordinates of a moving station have been determined as functions of the number and location of the stations. The effects of incorporating the input data from additional cameras at one of the stations were also investigated.
    Keywords: ASTRODYNAMICS
    Type: NASA-TN-D-7802 , L-9803
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Development and evaluation of a hybrid averaged orbit generator (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A rapid orbit generator based on a first-order application of the Generalized Method of Averaging has been developed for the Research and Development (R&D) version of the Goddard Trajectory Determination System (GTDS). The evaluation of the averaged equations of motion can use both numerically averaged and recursively evaluated, analytically averaged perturbation models. These equations are numerically integrated to obtain the secular and long-period motion. Factors affecting efficient orbit prediction are discussed and guidelines are presented for treatment of each major perturbation. Guidelines for obtaining initial mean elements compatible with the theory are presented. An overview of the orbit generator is presented and comparisons with high precision methods are given.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 78-1382 , Astrodynamics Conference; Aug 07, 1978 - Aug 09, 1978; Palo Alto, CA; US
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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