| 摘要 |
PURPOSE:To obtain sure control accuracy without increasing required transmission power of a slave station or over when a master station or a sub station exceeds a range of transmission power control by allowing a slave station equipment to compare a transmission signal of the master station and a transmission signal of the sub station so as to apply transmission power control. CONSTITUTION:A master station 1 and a sub station 2 being reference earth stations are provided with a control means making the effective equi-direction radiation power of a satellite 4 from a pilot signal in a communication frequency band and communication signals 101, 102 constant independently of the rainfall attenuation. Earth stations being slave stations 31-3m receive a communication signal 101 from the master station or a communication signal 102 from the sub station 2 to control a transmission power controller 25 via a logical device 24 with a signal from a detector 23 detecting the reception level for level calibration signal. That is, the logical device 24 switches the reception frequency of the reference wave receiver 21 for the master station 1 and the sub station 2 at a proper time interval. The system fault is detected from the difference between the reception of the level calibration signal from the master station 1 and the reception of the level calibration signal from the sub station 2 and the transmission power is controlled under the control of the level calibration signals. |
