The Research On CTCS-3 Vehicle-Ground Communication System Based On GNSS And 4G

GNSS dual-mode integrated positioning is a multi-system integrated positioning with existing GPS and Beidou satellite in China.It not only reduces the risk of relying solely on foreign positioning system,but also improves the anti-risk ability and stability.CTCS-3 train control system is the operation control equipment of passenger transport line with speed of 300 km/h or above.The traditional internal control network of high-speed train mostly adopts the technology of fieldbus network and realizes the information transmission between the ground control center and train by GSM-R network.Because of the limitation of its technology and bandwidth,Ethernet technology and 4G wireless communication network improve quickly.Ethernet will be mostly used to train control and 4G network will be applied to the transmission of vehicle-ground information in the future.CTCS-3 vehicle-ground communication system is one of the important components of train control system,because train running information and inherent information are provided by CTCS-3 of train control system.1?This subject is CTCS3 vehicle-ground communication system based on GNSS.According to the functions of on-board equipment of train control system in China,it analyzes the functions of on-board equipment.Based on the current bus technology of EMU,this subject is designed with the advantages of faster speed of Ethernet,better real-time performance and higher transmission efficiency of UDP protocol.Compared with traditional train-ground communication system,the application of GSM-R network and 4G network in railway trains can improve the speed of data wireless access,transmission and reception,and meet the requirements of railway operation management to ensure real-time data transmission.2?The hardware part is prime to collect and transmit differential data of high-speed train through Beidou/GPS dual-mode high-precision positioning and 4G wireless communication,and finally realizes the function of information exchange between on-board equipment and ground equipment of high-speed train.3?In the software part,a set of Windows desktop software is developed by using C++language and Qt development platform.The PC terminal connects the train switch to collect on-board information.Running this software can query train running data.In addition,the software contains a variety of retrieval means including data querying by UDP group,dataquerying by data ID,specific byte data querying.It can also send data packets.Train running data can also be transmitted to train control platform through MVB bus,main control module and 4G wireless communication so as to realize real-time inquiry of train running status.Python language is used to inquire inherent information of specified train number by simulating ground equipment.