| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve a system that has a small radio frequency band and eliminates the need for cable connection of the long distance on the ground side. <P>SOLUTION: In a station area, radio transmission between a ground side and an on-train side can be accurately performed even if one vs many or many vs many by a wireless type railroad crossing alarm control device 36 among ground devices 30 performing radio transmission with a frequency f1 as a main station while regulating timing on radio transmission using cable connection, and an on-train device 20 performing radio transmission with frequency f1 as a satellite office based on the crossing information 23, and in a pure single track area, the on-train side and the ground side becomes one vs many and radio transmission is accurately performed without connecting by cable by the on-train device 20 performing radio transmission with a frequency f2 as the main station based on the crossing information 23, and a wireless type railroad crossing alarm control device 32 of the ground devices 30 performing radio transmission with the frequency f2. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
