Design And Implement Of Btm Test System Based On LabVIEW And Modular Platform

Balise transmission module(BTM),as the core part to implement real-time communication of the railway control system,is the key hub to connect ground balise and train control system.With the increasing distribution of High-speed rail system in China,how to build the performance test of BTM has become an urgent problem to be solved during the deployment of train control system.To solve this problem,this paper proposes a method to test the "A interface" of BTM referring to the Eurobalise test specification and the concept of virtual instrument proposed by the National Instruments.This paper introduces the composition and function of the BTM,and analyzes the cooperation principle of system's three main parts:balise,BTM and lineside electronic unit.Then this paper selects the BTM to be subject of the test and Black-box testing as the test method.Then the frequency,frequency deviation and amplitude of uplink and downlink signals transmitted from "A interface" between BTM and the ground balise are discussed in details,and the test schemes for the stationary and the moving state of the train are formulated respectively.Finally,the two test subjects:uplink test and downlink test of BTM are finally formed.Based on the modular instruments provided by National Instruments and the LabVIEW programming language,the corresponding hardware and software implementations are proposed.The test topology is constructed referring to the test specifications.And test link is built using the signal generator,spectrum analyzer and other modular equipment.Finally the functions of the test system are verified with customized auxiliary test equipment and BTM.The results show that the system meets the theoretical requirements and can test the performance of BTM successfully.