| 摘要 |
<p>PURPOSE: To provide a self-complete type monitor system through which each train is able to judge all the circumstances of its own way. CONSTITUTION: An interrogator (a) transmits a query wave I (t), making a responder transmit a spectrum spreading wave T (t') synchronizing with another qury signal I (t-τ), and correlation between a response sign, where an envelope correlative network A8 is restored from a response wave T (t'-τ) and a reference sign from a sign generator circuit A11 is adopted. The reference sign complies a delay operation of a delay circuit A10 and thereby it is generated in delay of one bit width at a time till a comparator A9 detects that a correlative value exceeds the reference value. If the correlation within one bit is adopted, a differential value of correlative values between this time and the last one is inputted, and the delay circuit A10 is controlled and the reference sign delaying by unit width partitioning off the one bit is generated, and thus an operating delay value at a time when the differential value comes the vicinity of zero is imparted to an indicating part C1 as a propagation delay time, then a distance is displayed.</p> |
