Chapter 2106: And passive radar

This kind of meter wave radar is very difficult, but when Han found out that it was facing a great threat above its head, the 14 most prestigious institutes in Han country began research and development in this area. After years of hard work, they finally produced this meter-wave phased array radar, which is considered impossible by the West.
For example, the most representative one is the JY-26 of the Han country. The antenna array of this radar is so large that it is unimaginable. It is placed on a flatbed trailer. After the radar array is erected, it is more than ten meters long. It is tall and covered with cylindrical components. It looks like an iron fist rocket launcher is stuffed in. The dense array is enough to make people with dense phobias get goose bumps.
The performance of this kind of radar is also quite powerful. It uses advanced technologies such as active phased array, sparse matrix and super-resolution to improve the sensitivity, expand the coverage airspace, and the search distance exceeds 500 kilometers. Radar is tailor-made for stealth aircraft. When Eagle Country’s stealth aircraft begins to become a threat to Han Country, Han Country will definitely not wait for it to die. It must come up with a corresponding solution.
Not only Han, but after that era, other countries have begun to study ways to counter stealth aircraft, such as Ji Country’s Rice Wave Synthetic Pulse Aperture Radar, Hans Country’s Rice Wave Circular Array Radar, and Da Mao Country’s "Dongfang The "-E" and "Sky"-Y radars are all representative meter wave three-coordinate radars with good performance.
Among them, due to the confrontation of the Cold War, Xiong's research is the most advanced. After all, Xiong has a wealth of experience in the development and use of meter wave radar.
When faced with the threat of stealth aircraft, they developed a series of new three-coordinate radars, such as the most advanced "sky"-Y meter wave radar. It adopts the mobile meter wave three-coordinate scheme, which has both ranging and altitude measurement functions, and can track various air targets, even small hypersonic ballistic missiles and small stealth aircraft can be found at a distance of 600 kilometers.
Han is also unwilling to lag behind. By 2020, Han's meter wave radar technology is already at the world's advanced level.
Now, the contradictions are mutual. One has to develop a stealth machine that can break through the airspace of the other party at any time. Of course, one should also have the ability to protect against invading stealth machines. Of course, the stealth and anti-stealth ones will One's top secrets will never be leaked. After all, this is a key issue related to the outcome of future wars.
Qin Guan now pointed out the direction. On land, there is no need to worry about the size and weight. Therefore, such a large meter wave phased array radar can be manufactured. Of course, in order to prevent the first round of the enemy during the war. It is necessary for one's own side to make these radars into mobile deployment radars. During the war, the radar is also the most important target of the opponent's attack.
The development of this kind of radar is definitely difficult, even with the information provided by Qin Guan, it will take several years, but once it is researched out, it will definitely stand at the highest point of anti-stealth technology.
As for the stealth aircraft, how to improve it is invisible in front of the meter wave radar. Its various shape changes are invalid in front of the meter wave radar, because the meter wave radar sees only a single point. See all sides of it.
Now, Qin Guan has put forward the first important plan, which is to vigorously develop modern meter-wave radar technology. This is definitely not the old-fashioned radar, but the digital radar improved with modern electronic technology. Only radar networking is possible.
Qin Guan opened up an idea for everyone, of course, this is only one aspect of it.
"Another way of thinking about anti-stealth aircraft is to use passive radar." Qin Guan threw a new term. If the meter wave radar in front is clear to everyone, the back is really like a heavenly book. .
In fact, the West has already begun to study passive radar, but they are all researched under a high degree of confidentiality. In China, this project has not been involved yet.
"Passive radar is the opposite of active radar. Our usual radar emits radar waves by itself, and then receives radar waves, so that the target can be detected." Qin Guan said: "And passive radar, then We don’t emit electromagnetic waves ourselves, only receive them."
"If you don't transmit, how can you receive it? Whose is it?" someone asked.
You know, the basic principle of radar is a radio locator, transmitting a signal, reflecting a target signal, receiving, calculating the distance based on the time difference, and calculating the direction based on the rotation of the radar antenna. If nothing is transmitted, how can the target be known?
"There are two situations. Some targets are radiating electromagnetic waves themselves." Qin Guan said: "For example, taking military targets as an example, they may not turn on the radar, but their communication radio, transponder, and navigator, These are all radiating electromagnetic waves and can be located based on these electromagnetic signals."
Qin Guan opened a new world again.
Ordinary aircraft, even if the radar is not turned on, its radio must be turned on. Even if the radio is always passively receiving, the transponder must be turned on. Otherwise, it may be hit by friendly forces. There is almost no one on this thing. It will be turned off, even if the response mechanism is turned off, it has to navigate by itself, right? For example, its altitude is measured by an altitude measurement radar. In short, there will definitely be electromagnetic radiation. Based on these, the target can be found.
"If the target does not radiate any electromagnetic waves, then we have a way, because the sky around us is filled with electromagnetic waves all the time." Qin Guan said.
In later generations, communication companies are sometimes very helpless. Building a base station on the residential building of the community was originally convenient for the entire community. However, some people will not do it. No, there is radiation, and we must remove it. !
They are very concerned about radiation, even their wife is pregnant, and they don’t even want to go through a security gate, and they want a special passage for pregnant women. Of course, radiation protection clothing is the most expensive thing to buy. One thousand yuan, absolutely not blinking.
They hate this kind of base station even more, and must remove it.
Then, it was removed, and then another statement came, no, our mobile phone signal is not good, we must complain!
In fact, if you want to have no radiation in their mouths, unless you go to primitive society, in the whole world, radiation is everywhere. Sunlight is radiation. You can move the mobile communication base station away, and you can let the radio station, TV station, are everyone's phones turned off?
Even you have to turn off all cars. Gasoline cars are ignited with spark plugs. When they are ignited, there will be strong electromagnetic radiation.
The whole radiation is everywhere.
This also provides a stage for passive radar.