Method for comprehensively evaluating positioning precision of train positioning unit

Abstract

The invention provides a method for comprehensively evaluating positioning precision of a train positioning unit. The method comprises the following steps: selecting a SPAN-FSAS integrated navigationsystem as a real-time reference system, calculating an instantaneous positioning error between the same epoch train positioning unit and the real-time reference system, and evaluating the real-time positioning precision of the train positioning unit; and selecting a positioning result of GNSS / INS tight coupling and RTKLIB dynamic mode calculation as a post-processing positioning precision evaluation reference, calculating a post-processing positioning precision evaluation index of a train based on the post-processing positioning precision evaluation reference, and evaluating the post-processing positioning precision of the train positioning unit. According to the method, different high-precision reference systems are selected to serve as the real-time positioning precision evaluation reference and the post-processing positioning precision evaluation reference of the train positioning unit correspondingly, the train positioning precision evaluation index is calculated correspondingly, the positioning performance of the train positioning unit is evaluated comprehensively and quantitatively, and the method has the characteristics of low construction and maintenance cost and capabilityof obtaining absolute positioning precision.

Description

technical field [0001] The invention relates to the technical field of train positioning, in particular to a method for comprehensively evaluating the positioning accuracy of a train positioning unit. Background technique [0002] In order to better adapt to the needs of railway development, meet the requirements of higher operating speed, higher traffic density and lower railway construction and operation and maintenance costs of my country's railways, my country's next-generation train control system changes the traditional positioning method based on trackside equipment. The train positioning method based on Global Navigation Satellite System (GNSS) can not only reduce trackside equipment such as track circuits and transponders, reduce construction and operation and maintenance costs, but also improve train positioning accuracy and achieve high update rate real-time continuous positioning. In order to meet the requirements of reliability, availability, maintainability and ...

AI Technical Summary

Problems solved by technology

[0005] The second positioning accuracy evaluation method is carried out during the use of the system. Since the real value cannot be obtained, the measured value of the positioning system can only be compared with the estimated value to evaluate the positioning accuracy of the positioning system and whether the positioning results meet the requirements of other systems. need

However, in this positioning accuracy evaluation method, to obtain a centimeter-level high-precision position solution, the carrier phase ambiguity must be fixed

However, in practical applications, the carrier phase ambiguity is difficult to fix. In most cases, the solution is a floating-point solution, which affects the evaluation results of positioning accuracy.

[0010] Based on relevant research at home and abroad, it is found that the current research on the evaluation of train positioning accuracy mainly focuses on the first positioning accuracy evaluation method. This type of accuracy evaluation cannot obtain the absolute positioning accuracy of trains in real time.

Secondly, there are relatively few studies based on the second positioning accuracy evaluation method or a combination of the two.

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