| 摘要 |
PURPOSE:To prevent disabled reception identification due to phase deviation in an equi-potential region by providing a reception station receiving a modulation wave signal from plural sending stations, monitoring the deviation of the reception signal phase in the reception station and controlling the phase of transmission signal of each transmission station so that the phase of the reception signal is identical. CONSTITUTION:A reception station always receives a modulation wave signal from plural transmission stations 3-1-3-n and when the transmission delay time is changed by the switching connection of wired lines 4-1-4-n between a central station 1 and transmission stations 2-1-2-n, it is detected immediately that the change is large and the phase of reception signal is deviated largely. The deviation of the phase of a reception signal is discriminated by a reception station 5 or discriminated by a central station 1 by transferring the reception signal to the central station 1 via the wired line 6. When the deviation of the phase of the reception signal is large, the transmission of one station among plural transmission stations received by the reception station 5 is stopped sequentially and the transmission phase of the transmission station is controlled to make the phase of reception signal in the reception station 5 identical. |
