Development Of Communication Signal Detection System For Metro Inspection Vehicle

In recent years,with the rapid development of China’s subway,the number of people carrying the subway has increased dramatically.The subway business is busy and the maintenance time is reduced.Therefore,it is necessary to develop a comprehensive detection vehicle to continuously detect the subway,and pay attention to the improvement of detection efficiency,so that the subway staff can find the problems at any time.It is urgent to develop an efficient comprehensive detection system for urban rail transit to improve the comprehensive detection efficiency and ensure safety.It is necessary to pay attention to the safety of subway,strengthen management,reduce mistakes and ensure safe operation.In signal equipment,signal machine,switch and balise belong to high-frequency fault equipment;in communication system,the coverage and interference of wireless signal are mainly analyzed.Based on the existing communication signal detection technology at home and abroad,this paper discusses the detection technology and principle of signal equipment such as signal machine,turnout and balise,and focuses on the detection technology and principle of wireless signal that affects the safe operation of the train.The Tetra and lte-m networks which are mostly used in Metro can realize online interference detection and identification,and automatically evaluate the service quality Estimate.Based on the actual demand and focusing on the communication signal detection system suitable for the detection vehicle,the detection system can carry the detection vehicle.According to the main analysis parameters RSRP and SINR of LTE-M of urban rail transit private network,by judging whether the PCI of the cell is the same as that of the adjacent cell,the co frequency interference identification algorithm is further studied,and the value of rsrp is analyzed to judge According to the main analysis parameters RSSI and C/I of TETRA,according to ETSI Tetra radio frequency test protocol analyzes the RSSI and C/I values,and proposes interference avoidance scheme.Through the data analysis of RSSI value,the service quality of the community can be judged,and the positioning of Metro kilometer mark is realized by using inertial sensor combined with a kilometer mark correction technology.In this paper,LTE-M and tetra test software are designed,which can realize on-line interference analysis and automatic evaluation of service quality,and can locate kilometer posts.The reliability of the system is verified by field test.The research results of this paper can provide some practical reference for Metro communication signal detection.