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  • Shear waves  (1)
  • VLBI  (1)
  • 1
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    Unknown
    NOAA
    In:  Technical Report, Rome, NOAA, vol. 10, no. 89-576, pp. 44
    Publication Date: 1971
    Keywords: Source mechanics ; Body waves ; Shear waves ; Waves ; Source
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 72 (1998), S. 343-349 
    ISSN: 1432-1394
    Keywords: Key words. MINQUE ; Block-diagonal bordered systems ; VLBI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract. A sparse matrix method is developed for computing variance factors for block-diagonal, bordered systems of equations using MINQUE (Minimum Norm Quadratic Unbiased Estimation). This method greatly reduces the computational effort required to apply MINQUE, thus making it practical to compute variance factors for some very large systems of equations. The computer implementation of the method is described and applied to the computation of variance factors for a combination of 1609 VLBI (Very Long Baseline Interferometry) observing sessions. The purpose of this test was to compute a variance factor for each of the data sets and, perhaps, to obtain more realistic variance estimates to replace those in common use for the analysis of VLBI data. It was found that the method is satisfactory for use with such large problems, and the test served to verify that the variances in current use in VLBI data adjustments are adequate.
    Type of Medium: Electronic Resource
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