| 摘要 |
PROBLEM TO BE SOLVED: To increase an amount of information to be transmitted to the ground from a train without augmenting the channel number of working frequency. SOLUTION: A train information setting part 8 of an onboard device 1 selects the train identifying information of a digital signal produced in classified code generating parts 15a to 15n according to a classification of transits, thereby transiting it to a modulator 18 which varies this information by a digital signal to which both frequencies f5 and f6 is transmitted, superposing this binary frequency information on the output of normal generating frequency f1 of an amplifier 9, and it is transited to the ground from a pickup 10. Two ground makers 31 and 32 receive train classified information of the binary frequency information of both frequencies f5 and f6 at a time when it is positively opposed to the pickup 10, while a train formation receiving unit 33 demodulates and devices the received train classified information, and further the decided information is collated, thereby judging the classification of both passing and stopping trains. |
