thesis

Time dependent geodetic networks and coordinate systems

Abstract

This thesis represents the theoretical and practical aspects of establishing a new coordinate\ud system on the basis of repeated GNSS observations, which is defined in five steps. First,\ud we determine the precise coordinates of geodetic stations that are in the second step\ud transformed to a global coordinate system. In the third step we determine the coordinates\ud of geodetic stations for the reference epoch with their corresponding velocity vectors on the\ud basis of repeated GNSS observations. The fourth step is establishing a proper coordinate\ud system performed using a time-dependent spatial transformation. On the basis of the\ud estimated velocity vectors in the newly established coordinate system, the geokinematic\ud model of the corresponding territory can be determined with the least-squares collocation\ud in the final, fifth step. The practical part of the thesis is based on repeated GNSS\ud observations in the territory of Slovenia and its surroundings over the last 20 years. The\ud GNSS observations were obtained for the geodetic stations of the passive GNSS network\ud as well as for permanent GNSS stations. Besides, our work included the establishment\ud of a new coordinate system, and an analysis of the precision and accuracy of the already\ud established coordinate system based on GNSS observations, which has been officially used\ud in Slovenia since 2008

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