| 摘要 |
In a propagation time detecting system wherein a transmitting station transmits to a receiving station through a plurality of transmitting lines of different propagation times a transmission signal comprising a sequence of transmission data digitized by a clock signal of a clock frequency. The receiving station receives the transmission signal through the transmitting lines as different received signals and reproduces the sequence of transmission data and the clock signal as different reproduced sequence of transmission data and different reproduced clock signals from which differences are detected among the different propagation times. In order to improve accuracy of the detected differences, at least one subcarrier signal of a frequency higher than the clock frequency is also transmitted together with the transmission signal. The receiving station also reproduces the subcarrier signal as different reproduced subcarrier signals which are compared with each other to produce time differences therebetween with a reduced time order. In an application to a radar system, the transmission signal including the subcarrier signal is compared with an echo of the transmission signal from an target to produce a propagation time between the radar and the target. |
