## 1 Introduction
The drawbacks of the GNSS method, such as uneven sampling after removal of poor quality and missing measurements, the unreliability of the height component, signal interference, etc., were overcome by the introduction of additional surveying measurements with the RTS. With the development of technology and additional software, such drawbacks have been eliminated. As far as construction, conditions and, of course, time allow, it is best to perform measurements with different methods (GNSSs, RTSs and accelerometers) and to compare the results, as shown in previous studies [16; 17]. Recently, many authors [18; 19; 20; 21; 22; 23; 24; 25; 26; 27; 28] have been working on the use and accuracy of GNSSs, terrestrial laser scanners and RTSs in determining the dynamic responses of structures in the form of continuous monitoring. In previous studies [29; 30; 31], the results of investigations into the possibility of using RTSs for tracking targets in motion have been described. In this work, the authors describe, in particular, the error of non-synchronised operation of the sensors of the length- and direction-measuring instruments, which leads to systematic errors in the determination of the coordinates of the target position. In other work [32; 33; 34], robotic total stations from different manufacturers were tested in determining the position of a target moving along regular circular arcs and directions at different target-motion speeds. In [35], an RTS was tested in measuring high-frequency displacements in the horizontal direction. In another paper [36], an RTS was tested for dynamic bridge displacement measurements, and the advantages and disadvantages of using RTSs for such measurements were given. The biggest disadvantage of the measurement instruments is the slow and uneven performance of the measurements. In [16], comparisons of bridge dynamic parameters determined with GNSSs, RTSs and accelerometers are presented. In the last five years, however, a new technology has appeared in the field of vibration measurement of structures that allows us to continuously measure with high frequency the response of a structure in all three axes. The article [37; 38; 39; 40; 41; 42; 43; 44; 45; 46] describe data capture methods that allow measurements of up to 20,000 Hz and more, from which we can obtain highly accurate and reliable results. The problem with these methods is their range and their difficult installation on demanding structures. By this we mainly mean inaccessible terrain, situations involving water and traffic under buildings, structures with large spans and prestressed structures that prevent us from obtaining a horizontal view. Precisely for this purpose, we looked for solutions with other simple non-contact methods that could also be used to obtain reliable results; the methods were independent of the previously listed problems. As we have already mentioned, measurements can be performed using the geodetic RTS method, which can be used to perform measurements at greater distances and angles. In the future, the development of this equipment will also enable continuous and more frequent results from which we will be able to reliably calculate the dynamic responses of structures. Geodetic monitoring is now recognised as one of the fundamental approaches for obtaining data on the dynamic responses of structures in civil engineering, as instruments such as the robotic tachymeter (RTS) can be used to obtain monitoring data at frequencies of up to 30 Hz. The advantage of geodetic monitoring over conventional physical methods is the elimination of physical sensor placements, as is known from inductive meters. The data obtained with a non-contact measurement system include the displacements at specific points, which may be at different locations. By automatically capturing the measured values, the positions of the measurement points can be determined quickly and reliably. As the analysis of the oscillation signals is conditioned by the sampling frequency, the accuracy of the measurements improves with the sampling frequency.