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雷达的英文全称是Radio Detection and Ranging,原意为无线电检测和测距,筒称Radar。雷达是从Radar音译而来的。雷达是一种利用电磁波发现目标并测定其位置的电子设备。举个简单的例子,当你置身于一间黑暗的屋子里,无法看见周围的事物。这时,如果能够打开手电筒,让它发出的光束沿着屋子扫一圈,被光束照射到的物体反射到你的眼睛里,你就能清楚地知道屋子里究竟有哪些东西,以及它们的具体位置了。雷达的作用与这个手电筒的作用十分类似,不过它发射出去的并不是光,而是具有光束的高能量的脉冲电磁波。以一次雷达为例,通过天线发射出去的电磁波被目标部分反射回来,根据电磁波由发射出去到反射回来所经历的时间可以测定距离;根据收到反射波时天线所指的方向可以测定方位;根据距离和波束所指的仰角可以测定高度。雷达通过天线的旋转,实现全方位的扫描,再对接收到的目标回波进行一系列处理后,能够
The full name of the radar in English is Radio Detection and Ranging, originally intended for radio detection and ranging, tube called Radar. Radar is transliterated from Radar. Radar is an electronic device that uses electromagnetic waves to find a target and determine its position. To give a simple example, when you are in a dark room, you can not see anything around you. At this time, if you can turn on the flashlight, let it emit a light beam along the house in a circle, the object is reflected by the light beam reflected in your eyes, you can clearly know exactly what the house, and their specific Location. The function of the radar is very similar to that of the flashlight, but it emits not high-energy pulsed electromagnetic waves but beams of light. Take a radar as an example, the electromagnetic wave emitted by the antenna is reflected by the target part, and the distance can be measured according to the time elapsed from the time when the electromagnetic wave is emitted back to the reflected wave. The azimuth can be measured according to the direction of the antenna when the reflected wave is received. Elevation can be determined by the distance and the elevation of the beam. Radar through the rotation of the antenna to achieve a full range of scanning, and then received a series of target echoes processed, able to