The work is devoted to the investigation of the accuracy characteristics of reflectorless laser rangefinders. The method of evaluation of accuracy of measured distances for different reflecting surfaces, based on the analysis of differences of measured distances at two reflector positions, fixed independently with increased accuracy, is presented. The measurement technique involved the use of reflective surfaces of two colors set at different angles to the laser beam. The proposed approach was applied to the laser tape measure "DISTO Pro" model of the Swiss company "Leica". For the conditions of real measurements simulated in the experiments, the numerical values of the errors of the examined tape measure were obtained. Based on the results of processing the data obtained, conclusions were made about the possibility of improving the accuracy of such linear measurements.
The images obtained with digital cameras (Olympus, Sony) were analyzed and SCANCORRET module of digital photogrammetric station PHOTOMOD was used to correct distortions.
The TDA-5000 is one of the best examples of modern electronic total stations. This instrument is capable of solving the widest range of geodetic tasks, from creating surveying grounds for topoplans to 3D object modeling. Built-in targeting and automatic tracking function allows to automate the work completely, and the ability to record information (made measurements) on PCMCI card installed in the device - to perform tasks even easier and faster. The declared manufacturer accuracy of this device is 0.5" when measuring horizontal and vertical angles; when measuring distances 0.5 mm. The following was investigated: accuracy and limits of automatic aiming; accuracy of the angular part of the device; accuracy of the rangefinder part of the device. All researches of TDA-5000 showed the following: the angle measurement error is 0.3"; error of homing on ГК 0.6", on ВК 1.4"; mean square error of distance measurement 0.2 mm; maximum deviation angle of the initial point of search from the center of prism 1.5°; maximum deviation angle of sighting ray from the normal to the prism 27° The received results show that the device is suitable for highly accurate tasks. It is very advantageous to use such instruments for applied tasks because the TDA-5000 system is highly mobile.
