Abstract

DURAND, Marcelo; LANNUTTI, Esteban; LENZANO, María Gabriela  and  LENZANO, Luis Eduardo. Evaluation of the use of different antennas and the influence of the non verticality in GPS measurements . Geoacta [online]. 2017, vol.42, n.1, pp.01-12. ISSN 1852-7744.

In this work six tests of episodic GPS measurements were performed with 48 hours of observation, which aims to evaluate the repeatability of a position by using different models of antennas and also estimate the influence of non-verticality in the resulting coordinates. The requirement to obtain precise positioning in studies of the dynamics of the Earth, where the phenomena to be observed produce effects of just a few millimeters, leads to consider important factors such as the type of antenna to be used, avoid inclinations in monumentations and the application of correction files to observations. GPS observations have been processed with the Bernese software v5.0 using different algorithms. The comparison between antennas showed results with significant differences, 3 to 5 cm in the Up component, mainly when antennas suitable for topographic or cartographic uses (Trimble Zephyr) are used in networks with base-lines greater than 1000 km, with ionosphere-free combination with tropospheric parameter estimation solutions (L3+Tropo). In short base-lines (approximately 200 m) and single frequency L1 processing, differences in the Up component values were between 0,02 cm and 0,1 cm. In the case where the monumentation was tilted angle of approximately 5° toward north, a variation of the coordinates in the order of 1 cm in the Northen component was observed (tilt direction).

Keywords : GPS; Satellite Geodesy; Precise Positioning; GPS Monuments; Antennas Changing.

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