High Availability High-speed Railway Catenary Monitoring Gateway Technology Research

The catenary is an important subsystem of the high-speed railway,obtaining the electrical energy required by the trains through sliding contact with the pantographs.The working condition of the catenary directly affects the performance of the bow network system in terms of smooth flow,which is one of the key factors for the reliable operation of high-speed railway.This paper researches and designs a gateway suitable for catenary monitoring systems,which undertakes the functions of sending,receiving,caching,verifying and isolating the status monitoring data of key components of the catenary between the wireless sensing nodes and the remote data center,and is a key module for the data communication of the online monitoring system of the working status of the catenary.This paper focuses on the usability of gateway,based on the implementation of the basic functions of gateway at the hardware and software levels.Firstly,two queue cache reception methods with multiple checksum and retransmission are designed to improve the reliability of gateway for receiving data from both networks.Secondly,a multigateway collaboration mechanism is used to enhance the stability of data transmission to sensor nodes by using the collaboration of gateway in adjacent sub-WSNs.Finally,the 4G-based IAP enables remote firmware updates to the gateway,reducing maintenance costs and further enhancing the availability of the gateway.The gateway and catenary monitoring system designed in this paper was verified in a section of high-speed railway line for over 11 months,combined with various performance tests in the laboratory,the results show that the gateway is able to transmit sensor node data to the data center in real time and reliably,providing decision support for the catenary maintenance engineers.