In the graduation thesis, we test the limits of operation and reliability of the IMU-system within the instrument Javad Triumph-LSA. The system allows compensating the non-verticality of the GNSS pole in RTK-positioning. First, we determined the RTK-coordinates of the reference point in the vertical position, and then gradually tilted the instrument in different directions and different tilt angles, all the way up to 40°. Between the GNSS pole and the antenna, the 360° Leica prism was mounted, to which we performed measurements with three tachymeters. We obtained three independent measurements of each slope point by avoiding recording errors. From the measured slope points, the calculation the slope and azimuth was performed, respectively the orientation of the instrument. The aim of the task was to determine the quality of coordinates of angle the inclination Javad Triumph-LSA can still determine the position within the quality, required in geodesy and at what inclination the instrument is still capable of measuring. We found that, in addition to tilting the instrument in a vertical direction, the quality of positioning is also influenced by the tilt direction (azimuth). At higher tilt angles, the coordinates of the points determined at the same tilt and different azimuth vary by up to 7 cm.
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