A BASIC STUDY ON DETECTION PRECISION OF LAYER THICKNESS BY THE MMS EQUIPED WITH PHASE DIFFERENCE TYPE LASER SCANNER ON THE RELATIONSHIP BETWEEN THE DRIVING SPEED AND SATELLITE POSITIONING CORRECTIONS

Abstract

 Currently, as an efficient inspection method for civil engineering structures, The Mobile Mapping System (MMS) is used for this purpose. In addition to the conventional TOF method, the laser scanners installed in MMS include, In recent years, the phase detection method (PS method) has been adopted. In previous studies, the basic accuracy of MMS has been verified using the PS method, but There has not been sufficient verification focusing on the driving speed. In this study, MMS measurements by the PS system were made at speeds of 20 km/h, 40 km/h, 60 km/h, and 80 km/h, and the measurement accuracy was compared to that of the other methods. We compared them. As a result, the thickness calculation results show that the TOF method, the mean value of the calibration increased with the increase in speed, but with the PS method, there is no significant change in the RMS error of the calibration as the speed is increased. It was shown that the measurement accuracy was stable and good.