| 摘要 |
<p>PURPOSE:By measuring the relative distance between a tarin and a given point with a radar range finder and by continuously obtaining the actual value of the stated distance at an extremely high accuracy, to improve the quality of speed control of the train. CONSTITUTION:Mount a radar range finder 2 emitting microwave on a train. If the train now approaches the datum point s, the level of the reflective wave of the microwave issued from the stated finder 2 is elevated by a reflection plate 1 fit near the datum point S, and the finder 2 measures the relative distance to the reflection plate 1 sensing the elevated level. The information about the stated distance by this finder 2 is output to a position detector 3 successively and compared with the distance corresponding to a pattern length fit on the train which has previously been memorized in the detector. When those values coincide with each other, a gate is operated and the stated distance information is transmitted to the verifier 4. At the tinstant the actual speed of the train exceeds the speed of the pattern the emergency brake is applied.</p> |
