ATP 시스템의 발리스데이터 전송특성 시험 및 개선방안

Abstract

The most functionally important component of an ATP system is the Balise transmission system for transmitting track signals and track conditions to a moving train. A Balise transmission system consists of a Balise on the track and an antenna on the train to enable transmitance of digital information to the train as it passes the Balise. The Balise and onboard antenna are simple and critical components of the ATP system that require continuous performance and reliability. The purpose of this study is to derive the technical characteristics of the Balise air-gap interface through various tests and analysis, and to suggest ways to ensure safety and reliability of the Balise transmission system. The result of the test show that when the magnetic field strength of the tele-powered signal transmitted from the onboard antenna is above a certain level, the uplink signal of the Balise operates in saturation mode, and the magnetic strength of the tele-powered signal does not affect the input/output characteristics. However, various tests in this study verify that the relative position and cross-link area of the two antennas greatly affect the input/output characteristics. As a result of sampling and testing the Balise used in Korean railroad, it was found that the uplink signal was generated near the threshold in certain products, which may cause a telegram decoding error in the BTM. It was confirmed that in order to solve this problem, that it is necessary to prevent the uplink signal from being generated in sections where the current value of the uplink signal induced in the onboard antenna is less than the threshold value of the Balise input/output characteristics.