Research on Train Positioning Method Aided by Track Digital Map;

GPS technology is an effective way to achieve Low-cost Train Control System, but for real-time GPS positioning of trains, the track map database is the key point to combine the positioning data with the line conditions.

Application of 3D digital maps in equipment management;

Application of Digital Map to Flood Risk Graph;

MC calculation model of grid units on digital map used in route planning;

Curve watermarking technique for protecting copyright of digital maps;

This paper briefly summarizes the recent development of digitM mapping．It contains detailed introduction of the mappingfoundation of digital maps，production forms，software and their functionality．It also analyzes the recent development of digital map-ping in China.

Based on an analysis on the present situation and development of three kinds of signal systems (the point system based on interrogator responsor, the quasimoving block system based on digital track circuit and the moving block system based on wireless data transmission) in urban rail transit, some suggestions on the localization of signal system of urban rail transit are put forward.

With a biref introduction of the function, hardware structure,principle,characteristics and message contents of AF-904 digital track circuit system,this paper sums up the simple flow of message processing by testing AF-904 in Shanghai metro Line2,and holds that this system is feasible for UMT.

According to the practical requirement of the development in China railway, a new scheme for decoding MSK signal is proposed in this paper, on the basis of the basic principle of digital track circuit from abroad.