A Train Positioning Error Estimation Method Suitable for Multiple Trains Virtual Marshalling Control System

Abstract

Objective Virtual marshalling technology requires high precision and accuracy of train positioning, and traditional train positioning technologies are unable to meet the safety requirements of the virtual marshalling SIL4. Therefore, it is necessary to further study the positioning algorithm, estimate more accurate positioning error envelope, and shorten the train chasing distance in virtual marshalling to improve the marshalling safety. Method Traditional train positioning technologies divide the positioning process into train speed measuring, distance measuring and initial positioning. Based on the error factors existing in the three parts of the positioning process, a new calculation method of train positioning error envelope is proposed. The upper and lower boundary envelope for the three parts of the positioning process are obtained by mathematical derivation and calculation of each type of the error respectively. Result & Conclusion The proposed method fully considers the error factors in train speed measuring, distance measuring and initial positioning, making the upper and lower boundary envelope of positioning errors more accurate and reducing the conservation in traditional positioning error calculations. Meanwhile, the proposed method can reach the safety level of SIL4, meet the safety requirements of virtual marshalling control system in train close chasing scenario, and further shorten the train chasing distance, improving transportation efficiency.

Keywords

• rail transit
• virtual train marshalling
• train positioning
• positioning error