Development Study on CBTC Related Techniques Based on Systematically Analyzing Granted Patents of Nippon Signal Company

Communication based train control (CBTC), which has the advantage of high-precision train positioning without relying on track circuit and realizing real time train-ground wireless communication, has been widely adopted in urban rail transit system. Studying the technical development of CBTC is of great significance for comparing the characteristics and differences of relevant technologies, and mastering these technologies, so as to ensure the operation safety of urban rail transit system and improve its operation efficiency. By considering that Japan started early in the development of rail transit system, and Nippon Signal company is a well-known enterprise in the field of rail transit signal control, in this paper, Nippon Signal company has been set as the target enterprise to understand the development trend of CBTC, its patent development context has been analyzed, the most important technologies reflected in its innovation patents applied including train-borne devices, ground devices, train control system and train have also been discussed in detail.