| 摘要 |
PURPOSE:To transmit a synchronizing signal in a prescribed format and to improve the communication efficiency of TDMA communication by using a non- directional or form block antenna for a descending circuit from one station to plural stations and a scanning beam antenna for an ascending circuit from plural stations to one station. CONSTITUTION:A 90 deg. fan beam pattern 10 for a descending line is used for the descending circuit of one station, a scanning beam pattern 11 for an ascending circuit is used for the ascending circuit and the 90 deg. range is covered with n beams and scanned at a high speed to execute TDMA communication. A synchronizing signals 8 is arrayed on the head of a frame format to be used for the communication, plural bursts are arranged after the signal 8 and control bursts 9 and a pre-amble 7 are formed in the bursts 5. Thus, signals outputted from plural stations in the descending circuit within the 90 deg. range can be always received by one station, which extracts respective synchronizing signals 8, detects the position of the control burst 9 of the station itself and sends an originating signal or the like by the burst 9. |
