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问:什么是雷达? 答:雷达的发展与军事、战争有着密切的联系。达是个外来语,英文是radar,意思就是无线电探测、距。自然界存在以下物理现象:①电磁波能够辐射;②波的传播速度30万千米/秒,也就是说每秒能绕地球7周半;③电波发射后碰到物体(特别是金属物体)能发生反射。这些现象是雷达工作的基础,就是说雷达要能产生无线电波,并把它发射出去,无线电波在空中高速传播碰到物体(如飞机)后发生反射,反射的无线电波被雷达收到确定它的存在,也就是探测到了目标,这就是雷达的工作过程。雷达广泛地用于军事领域和国民经济建设中。
Q: What is a radar? A: The development of radar is closely related to military and war. Da is a foreign language, English is radar, meaning radio detection, distance. Nature has the following physical phenomena: 1 electromagnetic waves can radiate; 2 wave propagation speed of 300,000 km / s, that is around the Earth every 7 weeks and a half; 3 after the launch of an electric wave objects (especially metal objects) can be reflected . These phenomena are the basis of radar work, that is to say, radar should be able to generate radio waves and send it out. Radio waves are reflected at high speed in the air and come into contact with objects (such as aircraft). The reflected radio waves are received by the radar to determine it. The existence of this, that is, the detection of the target, is the working process of the radar. Radar is widely used in the military field and the national economy.