Train safety envelope calculation method based on satellite positioning environment scene error characteristics

Abstract

The invention provides a train safety envelope calculation method based on satellite positioning environment scene error characteristics. The method comprises the following steps: collecting and analyzing GNSS train positioning data, and calculating an error value of each positioning result; segmenting the train positioning data according to scenes along the railway where the train runs, calculating an error average value under different scenes, and fitting to obtain an error distribution model under each scene; calculating a deviation distance between the current positioning point and the track, and determining an error confidence interval of a train positioning result in the current scene along the track direction through multi-hypothesis testing according to the deviation distance, an error distribution model in the current scene and a train running state; and according to the average error, the error confidence interval and the horizontal protection level of the train positioning results in the current scene, calculating the safety envelope length corresponding to the position of the vehicle-mounted antenna of the single train. Safety envelope estimation of the train positioning result can be realized, and the safe position of train operation can be determined.

Description

technical field [0001] The invention relates to the technical field of train positioning, in particular to a method for calculating a train safety envelope based on the error characteristics of a satellite positioning environment scene. Background technique [0002] The current CTCS (Chinese Train Control System, Chinese Train Control System)-3 train control system determines the position of the train mainly through the combination of on-board speed sensors and transponders, based on the Global Navigation Satellite System (GNSS) The advanced train positioning technology can improve the autonomy of train positioning, reduce trackside equipment, and reduce construction and operation costs. [0003] The spatial propagation of GNSS signals is a process of electromagnetic wave propagation, and the propagation path will be reflected and refracted by surface objects; the performance of the receiver itself will be affected by other aspects, and performance degradation will occur. Th...

AI Technical Summary

Problems solved by technology

[0004] The operating environment along the train is complex, and satellite signals are easily affected by typical environmental scenarios such as valleys, forests, tunnels, and stations, resulting in a decrease in the accuracy of the GNSS train positioning function, or even failure

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