Abstract
In East Japan Railway Company(JR East), the ATP system based on the transponder technology is applied to upgrade the safety on commuter lines in the Tokyo metropolitan area since 1989. This ATP system was named ATS-P(the Automatic Train Stop with on-board Pattern) in Japanese National Railway. This ATS-P performs the wayside-to-train communication by the transponder technology. The coded message transmitted from a ground coil enables the on-board devices to perform a continuous supervision of the train speed. The lines equipped with the ATS-P system accounted for 706 kilometers as of December 31,1995. Applying the ATS-P to moderate traffic lines, it would be necessary to develop a cost-effective on-board equipment and wayside equipment. In February, 1994 authors decided to develop the wayside equipment of such a system at first and named the developed unit the ATS-P(N> in October, 1995. ATS-P(N) also uses the transponder technology and especially makes full use of the ground coils without power supply cable. The ATS-P(N> system is constructed of several ground coils and relay-modules to change the train control telegrams according to signal indications. It's really significant that the ATS-P(N) system is simpler than the ATS-P ground system. So, the total cost of ATS-P(N)is less than 50% of the ATS-P ground system. The ATS-P(N> will be applied on two conventional lines in 1997. 1 ATS-P system Transponders are generally used as repeating devices in communication satellites and for identifying an aircraft. But as shown in Fig.l, it serves as a digital communication device for sending and receiving information between ground coils and on-board coils. Some transmission specifications for the transponder are illustrated in Table 1. The fixed information such as a station name, etc., can be transmitted using Transactions on the Built Environment vol 18, © 1996 WIT Press, www.witpress.com, ISSN 1743-3509
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