Abstract: Dynamic observation with multi-sensor set as the core and collaborative solution of multi-source data is an important development direction of track engineering measurement, and important progress has been made. However, due to technical protection and other reasons, there are few literatures on the research and discussion of the integrated multi-sensor track measurement system. This paper presents and introduces an orbit measurement system based on multi-sensor integration and its data processing scheme. The system takes total station and inertial navigation as the main sensors, and adopts mobile measurement-static point fixed-point correction in the acquisition mode. In the calculation of track geometric parameters, the research system gives two static point calculation schemes, adjustment solution and single point control, according to different accuracy requirements and taking into account efficiency. The dynamic trajectory is calculated smoothly by fusing fixed interval filtering, and the track position is solved with the help of inclination and attitude, so as to realize track dynamic measurement. The experiment shows that the system realizes the absolute measurement of track line, and its measurement accuracy of lateral deviation is 4 mm and vertical deviation is 3 mm, which meets the current index requirements, and provides a good reference scheme for the development of track dynamic measurement technology in the field of road and track operation detection and measurement.

Key words: dynamic measurement, total station, inertial navigation, measurement adjustment, RTS smoothing