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• W97479486 abstract "In the scope of developing a new software package (Vienna VLBI Software, VieVS), for the analysis of Very Long Baseline Interferometry observations, all parameters to be estimated are basically modelled with piecewise linear offsets at integer hours, or at integer fractions or integer multiples of integer hours. In this presentation, we illustrate the outputs of the new software with several plots. These are piecewise linear offset estimates of clocks, Earth orientation parameters, antenna coordinates, tropospheric gradients, and zenith wet delays with their respective covariance matrices. The EOP covariance matrices depend on the number of antennas which are fixed. Besides, we investigate the effect of reference clock choice on the zenith wet delay piecewise linear offsets. Acknowledgements. This work was sponsored by the Austrian Science Fund (FWF) (Project: P20902-N10) and we are grateful to the International VLBI Service for Geodesy and Astrometry (IVS) for providing the observations. References. • Kutterer, H. The Role of Parameter Constraints in VLBI Analysis, 16th Working Meeting on European VLBI for Geodesy and Astrometry, pp. 171-179, 2003. •Titov, O., Tesmer, V., Boehm, J. OCCAM v. 6.0 software for VLBI data analysis. In International VLBI Service for Geodesy and Astrometry 2004 General Meeting Proceedings, Ed.; Nancy, R., Vandenberg and Karen D. Baver, NASA/CP-2004-212255, pp. 267-271, 2004. Piecewise linear offsets. Clocks, zenith wet delays, tropospheric gradients, Earth orientation parameters, and coordinates of the radio telescopes are estimated as piecewise linear offsets (Equation 1) illustrated in Figure (1). n n-1 n-1 n-1 n n-1 a -a y(t) = a + (t-t ) t -t (1) Figure 1. Piecewise linear offsets ( ai ) of a daily (1440 minutes) session for 60 minutes ( ti+1 – ti ) estimation intervals. Estimating piecewise linear offsets with least squares. VLBI parameters can be estimated as piecewise linear offsets with Least Squares (LS) (Titov et al. 2004). Offsets are chosen as the parameters of a continuous piecewise linear function. The partial derivatives of the observation equations are given below." @default.
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• W97479486 date "2009-09-01" @default.
• W97479486 modified "2023-09-26" @default.
• W97479486 title "Piecewise Linear Offsets for VLBI Parameter Estimation" @default.
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