A Doppler Frequency Shift Abrupt Processing Method for High-Speed Train Localization in Long Tunnel Scenarios

In recent years, it is of great significance to construct a high-precision positioning scheme for intelligent transportation in non-exposed space for all-airspace spatiotemporal network to obtain continuous and accurate position information of high-speed trains. Due to the narrow tunnel environment, when the train quickly passes through the positioning base station (BS), serious Doppler frequency shift mutation will occur, which reduces the tracking accuracy and robustness of the carrier ring and seriously affects the positioning accuracy of the train. Therefore, an adaptive tracking loop based on feedback local error search structure (ATLBOFLESS) is designed. The simulation results show that the proposed method can effectively reduce the influence of Doppler shift mutation on the tracking accuracy and robustness of the carrier loop.