| 摘要 |
PURPOSE:To ensure the coincidence of the sampling time for each observation station in case the data given from several observation stations are transmitted to the master station, by returning the synchronous pulse from the observation station and then giving an adjustment to the variable delay circuit inserted into the transmission line at the master station. CONSTITUTION:Command transmitter COMT of master station M delivers the synchronous signal and the command to slave station S. These command and signal are supplied to command receiver COMR of station S via 1st variable delay circuit DV1, MODEM-M, transmission line L and MODEM-S each. Thus the command controls sensor SN, and the synchronous signal decides the sampling time each. The synchronous signal is supplied to receiver RX of master station S along with the data sampled through transmitter TX via MODEM-S, transmission line L, MODEM-M and 2nd variable delay circuit DV2 each. Then phase detector PHD gives an interlocked adjustment to DV1 and 2 in order to secure the same phase between the synchronous signal sent back and the output of fixed delay circuit DF. |
