Study Of The Train Location Technology Based On Optical Fiber Gyroes Strapdown Navigation System

Along with the improvement of train speed and the booming development of high-speed railway, train operation need strong technical support from the train control system which has advanced, safety and reliable performance. Train control system need train speed and position information as reference and operation conditions to realize speed monitoring function. The train speed detection and location system is an important on-board equipment which provide train speed and position information.At present, train speed detection and location in our country is realized by the velocity sensor, track circuit and the balise. But the velocity sensor has shortcomings such as much error exist, the anti-interference ability is poor and vulnerable to external environment influence. The track circuit and balise train location is piecewise location and discrete, the location information is weaker in real-time and continuity. Strapdown inertial navigation system based on the optical fiber gyroes is a completely independent speed detection and location system. It is not dependent on external equipment and information, has advantages such as strong anti-interference ability, higher precision, lower cost, small volume, continuous output of the speed and location information, and it is conveniently to be integrated with other systems. The technology is widely used in military and civilian for its unique advantage. The strapdown inertial navigation technology based on the optical fiber gyroes has good prospect in application for train speed detection and location.This paper analyze and research the feasibility and advancement of the subject based on optical fiber gyro technology, quartz flexible accelerometer technology and strapdown inertial navigation theory; design the train speed detection and location system model based on strapdown inertial navigation technology; deduced the error mode of strapdown inertial navigation system initial alignment based on the basic principle of strapdown navigation system initial alignment and using kalman filtering technology for the initial alignment; put forward the mathematical model for strapdown calculate module of strapdown inertial navigation system and systematic study the algorithms of strapdown calculate module; systematic analyzed the working process of optical fiber gyro and quartz flexible accelero-meter and established the corresponding mathematical simulation model; building the simulation model of the strapdown inertial navigation system based on Matlab/Simulink software and simulate calculation the working proces of strapdown inertial navigation system. Simulation results show that the system is stable and reliable, precision reach the expected performance.By the research and simulation experiment for strapdown inertial navigation technology based on the optical fiber gyroes, the results show that the system is reliable and precision within0.1%and performance meet the requirements of the train speed detection and location. Compare with the technologies of velocity sensor, track circuit and the balise, the precision have been vastly improved and the output of the speed and location information is real-time. Strapdown inertial navigation technology based on the optical fiber gyroes make the improvement of the control accuracy of train control system is possible and provide technical support for realize railway safer, more efficient operation.