| 摘要 |
PURPOSE: To improve the accuracy of delay time intensity ratio and phase ratio between direct wave and a delayed wave measured by sliding correlation with respect to a multiplex wave through a multipath. CONSTITUTION: This measuring instrument for the delayed wave caused by the multipath of a radio wave propagation path in digital communication is provided with a signal reception part 21 for receiving a spread spectrum RF signal, a PN signal generating part 24, a first mixer 25 for mixing the spread spectrum RF signal and a PN signal and performing inverse spread with sliding correlation, a second mixer 28 for mixing an inverse spread signal passed through a band pass filter 26 and a locally oscillated signal generated by a first signal generating part 31, DC component removing part 30 for removing a DC component from this output, a logarithmic amplifier 31 for outputting an amplitude information signal and a limiter signal from this output, and a phase detector 33 for outputting the phase information of a received signal from the limiter signal and an intermediate frequency signal generated by a second signal generating part. |
