| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a train position detector using a spectrum dispersion signal, whereby the train positions in a plurality of track circuits can be detected using one signal receiver. SOLUTION: A train position detector is composed of a transmit signal preparing means to prepare a plurality of transmit signals corresponding to a plurality of track circuits with a certain phase shift reserved from a PN symbol as the reference, an impressing means to impress the prepared transmit signals on the respective track circuits, a receiving means to receive signals from the track circuits 1T-3T, a delay processing means to generate delays of specified spacings in other receipt signals using one of the receipt signals as the reference, a detecting means which subjects the receipt signal as the reference and the delay processed receipt signal to a demodulating process for drawing-out of a transmit signal and senses the correlation value of the transmit signal drawn out, a distinguishing means which distinguises the detected correlation value in correspondence to the track circuits 1T-3T, and a judging means which judges existence of any train on the track circuit 1T-3T corresponding to the obtained correlation value on the basis of existence or non-existence of the distinguished correlation value.</p> |
