| 摘要 |
<p>PURPOSE:To enable the covering of the entire scanning range on the same time base by performing a scanning electronically within a vertical plane of a three-dimensional Doppler radar for weather conditions for detecting a speed component to be observed. CONSTITUTION:An antenna beam 17 set to an angle prescribed by an elevation beam control signal 11 has a beam range about 1.5. For example, when a beam controlling is performed by 6 millisecond per step for 40 steps of an elevation range of 0 deg.-60 deg., an elevation scanning time in one bearing can be 240 millisecond, namely, 1/4 second. On the other hand, a bearing-wise rotation of the antenna beam is made mechanically at a slower speed than the rate mentioned above as in the conventional system. Now when the bearing-wise rotation is sat one turn per min., a three-dimensional scanning of the whole sky can be completed in one min. In an elevation-wise direction, a short-time scanning allows observation of meteorological phenomena in the upper and lower sky on the same scene thereby determining continuous fields of wind in the vertical way.</p> |
