释义 |
雷达léidá利用极短的无线电波进行探测的装置。无线电波传播时遇到障碍物就能反射回来,雷达就根据这个原理,把无线电波发射出去再用接收装置接收反射回来的无线电波,这样就可以测定目标的方向、距离、大小等,接收的电波映在指示器上可以得到探测目标的影像。雷达在使用上不受气候条件的影响,广泛应用在军事、天文、气象、航海、航空等方面。{radar; device using high-frequency radio waves for detection. When a radio wave is transmitted, it is reflected back if it comes across an obstacle. It is based on this principle that a radar transmits the radio wave and uses a receiving device to receive the reflected radio wave to determine the direction, distance and size of an object. When the received radio wave is reflected on an indicator, the image of detected object is obtained. Radar is widely used for military purposes, in astronomy, meteorology, navigation, aviation, etc., and is not affected by weather conditions.}[英 radar] |