Method for implementing train positioning and real-time tracking using coherence optical fibre raster set
A fiber grating and real-time tracking technology, which is applied in the direction of using optical devices to transmit sensing components, signal transmission systems, instruments, etc., to achieve the effect of shortening the distance between vehicles
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Embodiment 1
[0012] Embodiment 1: as shown in Figures 1, 2, and 3, the present invention has adopted n coherent fiber grating groups (1) of wavelength division multiplexing, and n coherent fiber gratings of wavelength division multiplexing are used in the whole course of rail transit The group is close to the inner side of the rail (2), and the end of the fiber grating group is connected to eliminate the reflection of the fiber end face (3). This fiber grating group has a resin protective layer, one end of the optical fiber is connected to the multi-wavelength laser transmitter (5) of the traffic command center through the circulator (4), and the other end of the circulator is connected to the wave splitter after the optical amplifier (6) (7).
[0013] When the locomotive travels to the sensitive area of the i-th coherent fiber grating group, the amplitude oscillation of the corresponding wavelength will be generated. When the locomotive reaches the center of the assembly, the amplitude...
Embodiment 2
[0018] Embodiment 2: The present invention adopts wavelength division multiplexing n coherent fiber grating groups with resin protection layer to be close to the inner side of the rail during the whole rail transit. The distance between fiber grating groups is about 200-300 meters, which is equivalent to shortening the blocking interval of general track circuits by 10 times. When the locomotive travels to the sensitive area of the i-th coherent fiber grating group, the amplitude oscillation of the corresponding wavelength will be generated. When the locomotive reaches the center of the assembly, the amplitude of the oscillation at this wavelength reaches its highest point. As the locomotive moves away from the center position, the oscillation amplitude will decrease accordingly. One end of the optical fiber is connected to the multi-wavelength laser transmitter of the traffic command center through a circulator, the other end of the circulator is connected to a fiber amplif...
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