A VLBI variance-covariance analysis interactive computer program

Physics – Geophysics

Scientific paper

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Computer Programs, Covariance, Geodesy, Mathematical Models, Variance (Statistics), Very Long Base Interferometry, Algorithms, Geodetic Surveys, Geophysics, Radio Astronomy, Statistical Analysis

Scientific paper

An interactive computer program (in FORTRAN) for the variance covariance analysis of VLBI experiments is presented for use in experiment planning, simulation studies and optimal design problems. The interactive mode is especially suited to these types of analyses providing ease of operation as well as savings in time and cost. The geodetic parameters include baseline vector parameters and variations in polar motion and Earth rotation. A discussion of the theroy on which the program is based provides an overview of the VLBI process emphasizing the areas of interest to geodesy. Special emphasis is placed on the problem of determining correlations between simultaneous observations from a network of stations. A model suitable for covariance analyses is presented. Suggestions towards developing optimal observation schedules are included.

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