Abstract
The paper introduces testing procedures of several different geodetic centring devices performed mostly at the laboratory of the Research Institute of Geodesy, Topography and Cartography. Functional construction characteristics of a spherically mounted retroreflector Leica RRR 1.5’’, rotatable carriers Sokkia AP41 and Leica GZR3 and 12 different geodetic tribraches were examined. Further, a centring displacement instrument developed at the Czech Technical University in Prague, Faculty of Civil Engineering, Department of Special Geodesy, is evaluated in both laboratory and field conditions. For all tests, laser tracker Leica AT401 with a 5 μm standard uncertainty of absolute distance measurement, was employed.
Highlights
Initial purpose of the testing of centring equipment was fully practical
When Leica AT401 is used for calibrations of field baselines, the multiple centring is a significant source of error in an overall uncertainty budget
Laser tracker Leica AT401 proved to be a great instrument for purposes of testing geodetic equipment
Summary
Specific geodetic tasks require thorough knowledge of every instrument employed in the measurement process. The aim of the author was to minimize centring errors and to evaluate uncertainties of measurement during calibrations of the Czech state long distances measuring standard Koštice and the National calibration baseline Hvězda. Even if the absolute laser tracker disposes of the exceptional accuracy concerning the distance measurement [5], its range is limited up to 160 m in favourable weather conditions. Not many surveyors are forced to deal with the high precision such as discussed in the paper but occasionally they could need to know about general design limits of standard geodetic centring equipment. The article presents a quick way of the testing which uses advantages of the Leica AT401. Other conventional methods, including precise angle measurement and the use of a laboratory interferometer, are usually much more time-consuming and laborious [6]
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