Orbit parameter measurement method based on fiber optic gyro inertial navigation system

With the rapid development of railway transportation in China, Inspection and maintenance of railways are becoming more important. It is of great practical significance to realize the measurement of track geometric parameters efficiently and quickly for guiding fine tuning and railway maintenance. Aiming at the problems of low efficiency and high labor cost in traditional orbit detection, a fiber optic gyro inertial navigation system is proposed to measure the geometric parameters of orbit,so as to realize the efficient, continuous and accurate measurement of track parameters. Aiming at the application scene of railway track measurement, the fiber optic gyro inertial navigation system is installed on the railway track detection vehicle. In order to reduce the influence of accumulated error of inertial navigation system, the combination of inertial navigation system and odometer is adopted. Then the geometric parameters such as track direction and longitudinal of the track are calculated. In this paper, the updating algorithm of orbit attitude position is deduced, the calibration method of installation error in orbit detection scene is given, and the actual orbit test is carried out. <br/> <br/> Based on the track parameters measured by the total station, according to the position output by the system, the track direction and longitudinal value of 10m chord length is calculated and compared with the reference value. The track test experiment shows that, Excluding the measurement error of the total station itself, the error accuracy of the track parameters calculated by the system is less than lmm and the repeatability is less than 0.5 mm. with the traditional measurement method, this method effectively improves the relative measurement efficiency of the railway and lays the foundation for the precise inspection of the railway.