Continuous positioning system and method for navigation signals inside and outside tunnel

Abstract

The invention relates to a continuous positioning system and method for navigation signals inside and outside a tunnel. A radar velocity measuring and distance measuring instrument is used for measuring the arrival velocity and distance of a target, and marking a local time scale; a time service receiver is used for resolving TOD time and a satellite ephemeris, outputting 1PPS and 10MHz signals, and transmitting the signals to a satellite navigation signal simulator; a satellite navigation signal simulator and a leakage cable are alternately connected with each other, and used for performing simulation and transmitting satellite signals to the target in the tunnel; and a comprehensive control subsystem is used for reading the TOD time, the satellite ephemeris, speed and distance information with the local time scale as well as the position coordinates of the radar velocity measuring and distance measuring instrument, the satellite navigation signal simulator and the leakage cable, andcalculating a target trajectory and a simulation moment that the satellite navigation signal simulator needs to simulate. The radar velocity measuring and distance measuring instrument is erected outside the tunnel in combination with the existing leakage cable and optical fiber routing in the tunnel, and a navigation and positioning continuous simulation system is erected in the tunnel, so that the problems of loss of positioning results and time discontinuity caused by train entering and leaving the tunnel can be solved with low cost and high accuracy.

Description

technical field [0001] The invention belongs to the field of train navigation in tunnels, in particular to a system and method for continuous positioning of navigation signals inside and outside tunnels. Background technique [0002] At present, there are many tunnels along the railway line, most of which are still very long, and the navigation satellite signals are invisible inside the tunnels. After the train enters the tunnel, it will not receive the navigation satellite signals, the receiver will lose lock, and there will be no positioning results and time information output. In the existing technology, there are many methods for indoor positioning, such as WIFI positioning, pseudolite positioning, etc., but none of them are suitable for the narrow and long channel scene such as tunnels. WIFI positioning cannot help the navigation receiver to locate, and multiple pseudolites need to be densely deployed , and the near-far effect and multipath effect are seriously affected...

AI Technical Summary

Problems solved by technology

In the existing technology, there are many methods for indoor positioning, such as WIFI positioning, pseudolite positioning, etc., but none of them are suitable for the narrow and long channel scene such as tunnels. WIFI positioning cannot help the navigation receiver to locate, and multiple pseudolites need to be densely deployed , and the near-far effect and multipath effect are seriously affected

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