| 摘要 |
PURPOSE:To provide a subminiature satellite communication system capable of controlling the transmission level of a VSAT station. CONSTITUTION:An HUB station forms a transmission instruction, a slot number in use and slot utilization information in the order of younger station numbers, for example, based on station number information of all participating VSAT stations for which a transmission level control section 4 is registered and a modulator 2 sends an in-bound signal. The demodulator 5 of the VSAT station detects the transmission instruction and the slot utilization information and a modulator 6 forms and outputs an in-bound signal corresponding to the transmission instruction. Moreover, the modulator 6 references the slot operating information in the transmission of general data to select a slot. Then the demodulator 1 of the HUB station measures a reception level DELTAL of the reception in-bound signal, the transmission level control section 4 forms the DELTAL information with a station number added thereto and the modulator 2 sends the in-bound signal. The demodulator 5 of the VSAT station detects the DELTAL information and the modulator 6 corrects the transmission level by DELTAL. |
