| 摘要 |
PROBLEM TO BE SOLVED: To provide high versatility by effectively utilizing an antenna. SOLUTION: A fault is detected by inputting fault information indicating a state of a fault from three operational system transmitting/receiving parts 12a, 12b, 12c in a fault detecting part 15 and when the fault is detected in either one of the three operational system transmitting/receiving parts 12a, 12b, 12c, the antenna is switched so that the antenna previously assigned to the operational system transmitting/receiving part with the fault is assigned to a stand-by system transmitting/receiving part 13 in an antenna selecting part 16. |
