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  • 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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    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
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  • 3
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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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  • 4
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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.
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  • 5
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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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  • 6
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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 (
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  • 7
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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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  • 8
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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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  • 9
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    An approximate solution for the short-term motion of a lunar satellite. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Short term motion of lunar satellite, discussing third body disturbing functions and perturbation solution of nonsingular orbit elements
    Keywords: SPACE SCIENCES
    Type: AAS PAPER 68-096 , ASTRODYNAMICS SPECIALIST CONFERENCE; Sep 03, 1968 - Sep 05, 1968; JACKSON, WY; US
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  • 10
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    Nonlinear estimation theory applied to the interplanetary orbit determination problem. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Martingale theory and appropriate smoothing properties of Loeve (1953) have been used to develop a modified Gaussian second-order filter. The performance of the filter is evaluated through numerical simulation of a Jupiter flyby mission. The observations used in the simulation are on-board measurements of the angle between Jupiter and a fixed star taken at discrete time intervals. In the numerical study, the influence of each of the second-order terms is evaluated. Five filter algorithms are used in the simulations. Four of the filters are the modified Gaussian second-order filter and three approximations derived by neglecting one or more of the second-order terms in the equations. The fifth filter is the extended Kalman-Bucy filter which is obtained by neglecting all of the second-order terms.
    Keywords: SPACE SCIENCES
    Type: AD-765232 , AFOSR-73-1436TR , Symposium on Nonlinear Estimation Theory and its Applications; Sep 11, 1972 - Sep 13, 1972; San Diego, CA
    Format: text
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