The method using fiber grating to achieve coherence group train positioning and real-time tracking, using WDM n optical fiber grating with full coherence group resin protective layer in the inner side of the track to track traffic. The interval of the fiber grating is about 200 ~ 300 meters, which is equivalent to shorten the interval of the track circuit by a factor of 10. When the locomotive runs to the sensitive area of the first I coherent fiber Bragg grating, the amplitude oscillation will be generated. Multi wavelength laser transmitter and one end of the optical fiber through the circulator is connected to the traffic command center, the other end is connected with the optical fiber amplifier circulator, amplifier connected WDM, by WDM wavelength separation by photoelectric conversion into electrical signals, the input signals to all digital signal processing terminal, can accurately calculate the train the exact position, velocity and acceleration, realize accurate positioning and real-time tracking of train.
【技术实现步骤摘要】
【技术保护点】
一种利用相干性光纤光栅组实现列车定位和实时追踪的方法,其特征是:采用了波分复用n个相干性光纤光栅组在轨道交通的全程紧贴铁轨内侧,这种光纤光栅组具有树脂保护层,相干性光纤光栅组的设置间隔约为200~300米,光纤的一端通过环行器连接至行车指挥中心的多波长激光发射器,环行器的另一端连接光纤放大器,放大器后连接分波器,由分波器分出的波长经光电变换成电信号,将全部电信号输入到数字信号处理终端;当机车行驶到第i个相干性光纤光栅组的敏感区内,将产生相应波长的振幅振荡,当机车达到该组件的中心位置时,该波长的振荡振幅达到最高点,这些不同波长的振荡振幅反向传向指挥中心,由环行器传至分波器,变成电信号后,进入数字信号处理终端,可准确计算出列车所在的准确位置、速度和加速度,实现列车准确定位和实时追踪。
【技术特征摘要】
【专利技术属性】
技术研发人员:简水生,延凤平,谭中伟,任文华,郑晶晶,
申请(专利权)人:北京交通大学,
类型:发明
国别省市:11[中国|北京]
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