| 摘要 |
PURPOSE:To effectively use a satellite line by using a frame format provided with a slot for transmission synchronizing packet. CONSTITUTION:A receiving time base can be placed on a 17a as the example of a case in which there is the fluctuation of a propagation delay time caused by the positional fluctuation of a satellite. In this case, a transmission synchronizing packet signal is transmitted in a timing shown by a dotted line 25a, therefore, an error 26 is generated between it and a reference burst signal 19, however, this is detected and one that this is subtracted from a transmission additional delay 18 is used as a new transmission additional delay. Thus, the fluctuation of the propagation delay time is absorbed, highly accurate transmission timing by which a ground station is always in a nominal position can be prepared and transmission in the timing of a transmission packet signal 20 shown by a alternate long and short line can be attained. |
