Research on On-Board Data Transfer Method for Maglev Vehicle Diagnostic System Based on TRDP and Multicast

Due to the particularity of the maglev system, there is no physical connection between ground station and vehicle in the process of maglev vehicle running with high speed, the vehicle data are need to be transmitted to ground station by means of radio, and the operation of the radio system is controlled by mobile radio control unit (MRCU), so all data should be transmitted to the MRCU first. In order to meet the needs of data transmission between the on-board equipment and MRCU in vehicle communication network and enhance the reliability and security of the data interaction in the process of vehicle running, for on-board diagnostic data transmission, this paper studies and designs an on-board data transfer method (ODTM) based on Train Real-time Data Protocol (TRDP) and multicast technology. The use of TRDP improves the real-time and reliability of communication, and multicast technology can ensure that the on-board diagnostic data can reach different MRCU on the vehicle almost at the same time. This paper mainly introduces the vehicle diagnostic network communication topology structure, the use of TRDP and multicast technology, and finally illustrates the practicability of the proposed ODTM by testing the communication process.