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  • SPACE SCIENCES  (18)
  • EARTH RESOURCES AND REMOTE SENSING  (3)
  • Key words. Robust fitting  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Robust estimation of systematic errors of satellite laser range (1999)
    Springer
    Journal of geodesy 73 (1999), S. 345-349 
    Details
    ISSN: 1432-1394
    Keywords: Key words. Robust fitting ; Systematic errors ; SLR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract. Methods for analyzing laser-ranging residuals to estimate station-dependent systematic errors and to eliminate outliers in satellite laser ranges are discussed. A robust estimator based on an M-estimation principle is introduced. A practical calculation procedure which provides a robust criterion with high breakdown point and produces robust initial residuals for following iterative robust estimation is presented. Comparison of the results from the least-squares method with those of the robust method shows that the results of the station systematic errors from the robust estimator are more reliable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001900050252
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    Paper (German National Licenses)
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  • 2
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    Evaluation of the Seasat altimeter time tag bias (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two methods were used in analyses of Seasat altimeter data, aimed at the corroboration of an inherent altimeter microprocessor delay compensation value of -79.4 msec, which benefited from a global data distribution in the oceanic areas: (1) the crossover method, using altimeter data differenced at points where the Seasat ground track intersected with itself, and (2) the direct use of the altimeter data. Because the former method is independent of errors in the geoid model, it is considered the more reliable. For all crossover method results, the adopted value of -79.4 msec is within the bounds of the standard deviation associated with the estimates, of which -78.1 + or - 2.0 msec is considered the best representative.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Geophysical Research; 87; Apr. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Sequential filtering applied to the determination of tracking station locations (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The extended sequential filter has been applied to the problem of dynamically determining the geocentric coordinates of two laser satellite tracking stations. This filter provides significant advantages over the classical batch methods through (1) fewer iterations required for convergence, (2) wider radius of convergence, and (3) availability of the parameter estimate evolution. Processing the data sequentially readily identifies the data arcs required to minimize the effects of geopotential model errors. By means of the Smithsonian standard earth 2 and the Goddard earth model 1 geopotentials to reduce laser range observations of the Beacon Explorer-C satellite, it is demonstrated that a two-pass arc is optimal for estimating the height of one station and all coordinates of the second station while minimizing the effect of geopotential model error. These two-pass estimates are in good agreement with other determinations that utilize considerably more data as well as different satellites.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Geophysical Research; 80; Feb. 10
    Format: text
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  • 4
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    Lunar orbit determination in the presence of unmodeled accelerations (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A technique for estimating the state of an artificial satellite in the presence of unmodeled accelerations is presented. The unmodeled acceleration is approximated by a first-order Gauss-Markov sequence which can be separated into a timewise-correlated component and a purely random component. Using this approximation, a sequential procedure for estimating the position, velocity, and the unmodeled acceleration is developed. The method is evaluated by reducing range-rate observations obtained by tracking the Apollo 10 and 11 spacecraft during the lunar-orbit phase of the mission. Numerical results are presented which show that the observation residual pattern lies within the observation noise standard deviation. The values of the estimated components of the unmodeled acceleration are repeatable from orbit to orbit within a given mission and from mission to mission when the same ground track is covered. Finally, the variation in the radial component of the unmodeled acceleration shows a high correlation with the reported location of the lunar surface mascons.
    Keywords: SPACE SCIENCES
    Type: Celestial Mechanics; 9; Apr. 197
    Format: text
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  • 5
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    Some qualitative characteristics of near-lunar satellite orbits. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Motion of near lunar satellite in initially circular orbit analyzed by integrating equations for time rates of change of orbit elements
    Keywords: SPACE SCIENCES
    Type: AAS PAPER 66-95
    Format: text
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  • 6
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    The computation of optimal Apollo-type reentry trajectories. (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Apollo type reentry trajectory optimization numerical methods
    Keywords: SPACE SCIENCES
    Type: AMERICAN AUTOMATIC CONTROL COUNCIL, JOINT AUTOMATIC CONTROL CONFERENCE; Aug 05, 1969 - Aug 07, 1969; BOULDER, COLO.
    Format: text
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  • 7
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    Convergence acceleration procedure for the method of steepest descent (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Convergence acceleration procedure for steepest descent method for trajectory optimization
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-64474 , MSC-ED-R-67-52
    Format: application/pdf
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  • 8
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    Canonical transformation applications to optimal trajectory analysis. (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Canonical transformation and Hamilton-Jacobi theories applied to space vehicle trajectory analysis, discussing elliptical coast arc and optimal low thrust problems
    Keywords: SPACE SCIENCES
    Type: ; YAL SOCIETY (
    Format: text
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  • 9
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    Some qualitative characteristics of near-lunar satellite orbits. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Motion of near lunar satellite in initially circular orbit analyzed by integrating equations for time rates of change of orbit elements
    Keywords: SPACE SCIENCES
    Type: AAS PAPER 66-95
    Format: text
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  • 10
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    Persistent solar influenced libration point motion. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spacecraft libration point motion in restricted four body model including earth-moon orbit plane inclination to ecliptic, noting solar effects
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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