Abstract: The skylight time for precise measurement and tamping of existing ordinary speed railway track is short, which requires high operation efficiency. The operation effect directly affects the track quality and passenger comfort. The use of the measurement system provided by large-scale road maintenance machinery for both measurement and tamping has poor rectification effects, and can only control the overall unevenness of the track. Using relative rail inspection instruments to measure data to guide large-scale road maintenance machinery in digital tamping has improved the tamping effect, but it is still unable to control absolute linear and long wave irregularities. In this paper, the principle of the BeiDou-inertial navigation system(INS) precision measurement and tamping method of the ordinary speed railway is described, and the actual line is measured using the BeiDou-INS track geometry state measuring instrument. Through the BeiDou data solution, integrated navigation fusion processing and track alignment fitting optimization, the track amount and track setting amount that can be used to guide the digital tamping of large road maintenance machinery are obtained. After the completion of the actual operation of precise measurement and tamping, statistical analysis is conducted on the improvement of the static TQI of the track. The results show that the BeiDou-INS precision measurement and tamping method for the ordinary speed railway has high operational efficiency and significant improvement in track quality.

Key words: ordinary speed railway, accurate measurement and tamping, integrated navigation, track quality