| 摘要 |
PROBLEM TO BE SOLVED: To reduce the synchronization establish time by reducing a frequency deviation and a transmission-reception time deviation of a code division multiple access(CDMA) code. SOLUTION: A space station frequency deviation (or space station time deviation) is measured in advance by a transmission station as to a frequency deviation (or time deviation) of a space station 1 and the transmission station corrects the deviation and sends the resulting signal to a reception station 3 via the space station 1. As to a frequency deviation of earth stations 3, 4, each earth station receives a GPS signal emitted from a GPS satellite 2 and corrects a local oscillator of its own station according to a highly accurate time signal (or frequency deviation signal) obtained from the GPS signal. Finally the transmission-reception time deviation of the CDMA code is reduced from the accurate position and time of the GPS signal. |
