Abstract
For the controlled tilting system, a positioning method is used for running trains to measure their own position by the counts of tachometer-generator pulses and correct the position by detecting some ground markers like ATS ground coils whose position is known. However, the method sometimes failes to detect the train position since it relies on ground markers. Therefore, we have developed a system to measure the train position itself without depending on ground markers. The system changes the positioning method according to the condition of GPS signals, and has the positional accuracy of 4m or less in test running.
