Analysis of Frequency Response about Mutual Inductance between ATP and ATS Antenna in Combined On-Board System

Railroad signaling systems are to control intervals and routes of trains. There are ATS(Automatic Train Stop), ATP(Automatic Train Protection) and ATC(Automatic Train Control) system. Trains are operated in the section which is met on the signaling system because various signaling systems are used in Korea. Hence, trains are not operated in the section which is used in the other signaling system. To solve this problem, recently combined on-board system has been developed. The combined on-board system designed by doubling the ATS, ATP and ATC system. The inductance of antenna is change and in return the resonance frequency of antenna is varied. So, the information signal is not received. In this paper, the mutual inductance including the distance between the ATS and ATP antenna is calculated. As a result of the frequency response of the antennas, the mutual inductance met on range of operation frequency is defined.