A homogeneous approach for IVP estimation via conical model
| Autor: | Bae, T., Hong, C., Lim, S. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-0015 |
| Popis: | A new international terrestrial reference frame (ITRF2020) was recently released by combining the solutions from four space geodetic techniques. For this purpose, connecting the sensors based on local tie vectors at collocated sites is crucial. The3D circle fittingmethodhas been frequently used, which models the trace of a target attached to the antenna and/or telescope as a 3D circle in space.However, it requires a parameterization for each target, whichnecessarily causes too many nuisance parameters with only a few observations. We developed a completely homogeneous and robust model (called the “conical model”) to estimate the invariant point (IVP)of very long baseline interferometry (VLBI) or satellite laser ranging (SLR) telescope.The trace of each target in 3D space is modeled as a cone with the apex at the common IVP. Thus, the slant heights, as well as the primary parameters (that is, the IVP), are estimated along with the full variance-covariance information. It provides the estimation model with enormous degrees of freedom, and the tilting of the (ideal) vertical axis and the horizontal offsetbetween two rotational axescan be calculated simultaneously. The mathematical relationship of the target motions is constrained to the Gauss-Markov model to reinforce the estimated parameters. The proposed approach was successfully applied to the collocated site, resulting in a sub-millimeter level accuracy uniformly for the estimated IVPs and other accompanying parameters. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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