Design And Implementation Of Train-controlled Onboard Speed And Distance Measuring Device

The automatic train control system is a train protection system that automatically guarantees the safety of the railway and controls the automatic operation of the train.The speed measurement and distance measurement system is the core component of the train control system.Its main function is to provide accurate and real-time speed and distance information to the train control system.This paper refers to the existing speed measurement and distance measurement subsystem of the CTCS-200C train control system.After reading a lot of literature,based on domestic and foreign research,a new train control vehicle-mounted speed measurement and distance measurement device is designed and implemented.After analyzing and comparing the commonly used redundant structure design,this article replaced the original three-by-two structure with a two-by-two-by-two redundant structure,and designed a new hardware structure to further improve the safety performance of train operation.Aiming at the pulse counting problem of the axle speed sensor,this paper analyzes and compares the current commonly used electronic counting frequency measurement methods,and proposes an improved multi-cycle synchronous measurement scheme.This scheme can reduce the The effect of counting error on speed measurement is described.Due to the wheel idling,the speed measurement of the axle speed sensor will be inaccurate during the running of the train.In this paper,several common idling detection algorithms and compensation algorithms are compared and compared.The confidence interval compensation based on the statistical optimal estimation theory is proposed.Algorithm to improve the accuracy of compensation.Due to the insufficient speed measurement accuracy of a single sensor,this paper based on the CTCS-200C system hardware equipment,designed an information fusion scheme based on the federal Kalman filter algorithm,which improved the accuracy of the speed measurement positioning under a single axle speed sensor and reduced the speed measurement distance error.Finally,this paper uses MATLAB simulation software to conduct simulation experiments on the confidence interval algorithm and the information fusion algorithm,and verifies that the algorithm has significantly improved the accuracy of speed measurement and positioning.