Stealth aircraft is not transparent and invisible to the naked eye as we understand it. The purpose of stealth aircraft is to make it invisible to radar. The following section will introduce it in detail.
What is a stealth aircraft
Stealth aircraft is not transparent or invisible to the naked eye, but can not be detected by radar. Radar detection targets mainly rely on transmitting electromagnetic waves and receiving their echoes, so stealth aircraft mainly stealth from two aspects: one is the shape, which makes electromagnetic waves scatter aimlessly to prevent radar detection. The second is to use stealth materials to absorb electromagnetic waves, so that when the electromagnetic waves emitted by the radar come, they will not leave, so that the radar can not detect echoes.
The purpose of stealth aircraft is to make it impossible for radar to detect the existence of aircraft. Stealth aircraft is a combat aircraft that uses various stealth technologies to reduce the signal characteristics of aircraft, making it difficult for enemy radars to find, identify, track and attack, so as to achieve anti radar, anti infrared, anti electronic and anti acoustic detection purposes, so as to achieve stealth effects.
Is radar really useless for stealth aircraft?
Neither.
The radar can make the target clear by narrowing the viewing angle. After all, the thickness of the stealth coating is limited, and it is impossible to absorb all radar waves. However, to narrow the viewing angle, the antenna area must be increased. It's easy to increase the antenna area, but it's not easy to rotate after it is increased. What should I do? A new type of radar was born, phased array radar. Phased array radar does not need to rotate. It is composed of numerous independent transmitting units. When a large number of transmitting units transmit radar waves at the same time, interference will occur. The propagation direction of radar waves after interference will change. By controlling the phase difference of each independent transmitting unit, the transmission direction of radar waves can be changed. In this way, The radar can scan in all directions without turning, and the clarity is greatly improved. In a word, stealth aircraft and radar are one foot ahead of each other.
Since the advent of radar, the aircraft has had rivals, so aircraft manufacturers began to think about how to avoid being detected by radar, and then stealth aircraft was born.
The "stealth" of stealth aircraft is aimed at radar, and it is not really transparent. So how can we make the radar invisible? Quite simply, since the radar detects the aircraft by receiving the rebounded radar waves, it is only necessary to prevent the radar waves from bouncing back. How can we not let the radar wave bounce back? First, we should work hard on the appearance. The appearance of a stealth aircraft is very different from that of an ordinary aircraft. The stealth aircraft usually has sharp edges and sharp edges. This shape can easily lead to the deflection of radar waves, that is, the radar waves hitting the aircraft will not return to the original path. In this way, the radar will not receive information, and the aircraft will not be found naturally.
