In the CBTC system, the detection and precise positioning of the train speed are the guarantee for the safe and efficient operation of the train. Therefore, an in-depth study of the speed and position detection scheme of urban rail transit can more specifically find the existing problems and reduce the measurement errors caused by the problems. Therefore, this paper makes an error analysis of the current speed measurement positioning method in urban rail transit combined positioning, and hopes to make algorithmic compensation for this error to improve positioning accuracy. In addition, this paper compares the speed measurement errors of urban rail transit and high-speed trains, combined with the compensation scheme of high-speed railway speed measurement positioning errors, according to the special environment of urban rail transit operation, proposes an improved method that is more suitable for the actual situation of subway trains.

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