Does the big pot cover on the back of the early warning aircraft emit electromagnetic waves or receive electromagnetic waves? Where is the hovering cover of the radar station? Tell me exactly how rada

Does the big pot cover on the back of the early warning aircraft emit electromagnetic waves or receive electromagnetic waves? Where is the hovering cover of the radar station? Tell me exactly how radar works. Radar detects objects through its own ultrasonic waves. One is to emit radar waves, which will reflect some when encountering obstacles. After the radar receives the returned echo, the computer can calculate the position of the target relative to the radar!

The ground-based radar will also reflect the terrain echo because of the terrain fluctuation, and it is chaotic, so it is usually difficult for ground-based radar to detect objects below 100 meters, which is usually called radar blind area.

In order to solve this problem, people invented the early warning aircraft, that is, the radar was moved to the sky, standing high and looking far, and the appearance of new computers greatly improved the detection distance and accuracy of radar!

The so-called passive radar is not only an infrared search device, such as an infrared search and tracking system installed on a fighter plane. They identify, lock and attack by receiving infrared thermal signals from other objects. They do not emit electromagnetic waves themselves.

Anti-ship missiles attacking ships all adopt the composite guidance mode of inertial guidance and active or semi-active radar guidance. Because radar is more developed and has higher accuracy. Ground attack weapons are mainly the combination of inertial navigation and GPS guidance, and their hit accuracy is greatly influenced by the accuracy of navigation system. Therefore, China's ground attack weapons were almost blank in the past, but they have developed rapidly in recent years, mainly due to the development of its own positioning system and the application of laser guidance technology.