| 摘要 |
PURPOSE:To enable a slave station to determine a transmission time at any time, by transmitting the information of transmission delay between a reference station and a satellite by the reference station inclusive in its burst signal. CONSTITUTION:Electromagnetic waves received at an antenna 17 of a radio receiver 18 is converted into an intermediate frequency signal by a slave station to obtain a reception burst group through the demodulation at a PSK modulation and demodulation device 19. A burst multiplex converter 21 picks up a burst of each reference station and other slave stations from the received burst group and restores them into the information before transmission. A delay time between the slave station and the satellite, is calculated at a transmission controller 23, based on transmission delay information between the reference station and the satellite included in the information in each reference station, received time of the burst signal in each reference signal from a time detector 22, transmission start signal of the slave station from an input and output device 24 and position information of the slave station on each reference station, and the time of slave station to be transmitted is determined. The phase of the transmission burst signal is controlled with this time and the PSK modulator 19 is controlled based on this transmission output. |
