Design And Implementation Of Balise Performance Evaluation System Based On Uplink Signal

As an important part of the train operation control system,the balise system realizes the point transmission process of important information,such as ground transponder,temporary speed limit and grade conversion,through ground balise and vehicle BTM.It can be seen that the performance of the balise system will directly affect the normal operation of the train control system,even related to traffic safety.At present,with the improvement of the train running speed,how to comprehensively and accurately evaluate the balise performance has important practical significance for guiding the maintenance of the balise system and ensuring the safety of the train.Therefore,the following research works have been carried out in this paper:1.Determine evaluation indexes based on signal parameters and transmission characteristics,develop STFT algorithm-based index extraction methods for upper and lower side frequency,total bit number and transmission rate of uplink signals,and construct evaluation functions for each index.Firstly,based on the BTM information recording module developed by Beijing Jiaoda Sino Technology Co.,Ltd.as the research platform,the above side frequency,the lower side frequency,the transmission rate,the total number of bits,the bit error rate and the good bit rate are determined as the performance evaluation indexes of the balise from the two aspects of signal parameters and transmission characteristics.Secondly,the extraction method of the index of upper and lower side frequency,total bit number and transmission rate of uplink signal based on STFT algorithm is developed.Furthermore,the correlation between each evaluation index and the train speed is tested based on the multiindependent sample non-parametric test method Kruskal-Wallis test,and the functional relationship between the speed and the total number of bits is determined based on the least square method.Finally,the evaluation function of each index is constructed based on the quadratic parabolic function.2.The weight of each performance evaluation function of the balise was optimized based on the analytic hierarchy process(AHP)and particle swarm optimization(PSO),and the performance evaluation models based on weighted synthesis and rank-sum ratio of the transponder were built respectively.The hierarchical structure model of each evaluation index was established based on the principle of analytic hierarchy,and the weight of each index was calculated by using particle swarm optimization algorithm to optimize the consistency of each weight vector.Finally,based on the above index evaluation function and its weight,the weighted comprehensive evaluation method and rank sum ratio comprehensive evaluation method were adopted to comprehensively evaluate the balise performance.3.The software of balise performance evaluation system is designed and implemented.Based on the analysis of the overall requirements of the software,the software interface design,the demodulation of the balise uplink signal,the performance evaluation of the balise and the statistical analysis function are designed respectively,and the corresponding software functions are verified.There are 34 figures,32 tables and 53 references.