Accuracy of the Reflectorless Distance Measurements Investigation

Abstract

Reflectorless electronic distance measuring has found application in various surveying tasks. Accuracy of the distances measured using by instrument type GPT – 7505 which has a built-in laser measuring device. Research is focused to surveying to the reflecting surfaces which are made of the five different material: metal sheet, fine and coarse facade, styrofoam and wood. Also, experiment conducted for three different angles of inclination (0°, 45°, 60°) to the reflecting surfaces. However, because of the limited manipulation capability, 55 × 55 cm signals have been created. Results show that better accuracy achieved to the rough (styrofoam and wood) than to smooth reflecting materials. The maximum range of 1400 m achieved if material rough reflecting, but the smallest distance of about 750 m to the sheet metal reflecting surface. The results also indicate that the inclination of the reflecting surface affects the range, as well, especially for the styrofoam and wood surfaces. In last scenario rang was shorter, and was about 400 m. With the increase in range, the expected accuracy of the measured rang was expected, as shown by the test results. For ranges between 150–750 m, the best accuracy is achieved if styrofoam was reflecting, and the worst for sheet metal. As a conclusion, it is difficult to define the trend of accuracy in relation to reflecting surface material, either, the inclination of the measuring rang to reflecting surface.