Chapter 2105

There are many theories about stealth. For example, in many science fiction films, it is said that a person is invisible and can do whatever he wants. This kind of stealth means visual stealth, which can not be seen in the visible light band. For fighters, visual stealth has no great role, and it is not the development of the era of machine gun air combat, Missiles have become an important means of attack. Accordingly, the radar used to guide missiles is the most important. All stealth aircraft are stealth in front of radar.

However, the band of electromagnetic wave radiated by radar is quite wide. For electromagnetic wave, the longer the wavelength, the easier it is to diffract, that is, to bypass obstacles. Therefore, the original radio is long wave. For example, Navy submarines use long wave radio.

Long waves can travel around the earth, which is quite useful. However, long waves have a long wave, so their frequency is low, the transmission data is very slow, and the receiving and transmitting equipment are quite large, which will soon be eliminated.

Medium wave is used for television broadcasting. In the use of radar, almost all are centimeter wave and millimeter wave in short wave band. If the wavelength is short, it can propagate along a straight line, which is also necessary for radar. At the same time, the antenna aperture of radar is also small. Therefore, it is now the main stream.

The stealth machine is invisible to this band. It reflects the radar wave to other places through various surface shapes, absorbs the radar wave with absorbing materials, and so on.

Then, accordingly, there is a very direct way to crack the stealth machine.

"We can first use meter wave radar," Qin Guan said.

As the name suggests, meter wave radar refers to the wavelength of radar wave, which is the order of meters. If the frequency is converted between one and ten meters, it is 30 to 300 MHz. This kind of radar is a mainstream at the beginning.

You can see the movies during World War II. Many radar antennas are large, like Yagi antenna of TV receiver. This is meter wave radar.

However, the meter wave radar was soon eliminated. There are too many shortcomings of this radar, because it is of the order of meter wave. Therefore, when it detects the target, the accuracy is quite poor. When it finds the target, the error is hundreds of meters, or even thousands of kilometers. It is still possible to guide the aircraft to detect. If it guides the missile attack, it will definitely not find the target.

At the same time, many civil signals, especially TV signals, are also in the meter wave band. In this way, the interference of civil signals will appear.

These problems are not adjustable. Therefore, the meter wave radar was put on the shelf soon after the end of World War II. At most, it is used as a long-range air defense warning radar and can not play a greater role in air defense operations.

But now, the meter wave radar will come back soon. One of its biggest advantages is anti stealth aircraft! In front of the meter wave radar, the stealth means of the stealth machine is useless!

For example, look at the most advanced missile destroyers in the Han Dynasty. At 052c, there were only four phased arrays and roof radar. However, at 052d, there was a huge and complex Yagi antenna behind. That kind of radar was used for long-range early warning. With it, of course, it was to deal with the threat of an increasing number of stealth aircraft.

It can be said that when the Han country developed to 052d, the destroyer had really developed and matured. This complex Yagi antenna was used for long-range early warning and found the other party's stealth aircraft. However, the accuracy of this radar was limited and could not guide missile operations. At this time, it was necessary to cooperate with the front phased array radar, which gathered all beams, It must be possible to find the stealth plane.

Now, in the development of radar, meter wave radar is almost abandoned. Now, Qin Guan has put forward this view. We should pick up our meter wave radar again. After all, there are still many meter wave radars in use in the land and air defense of Han.

"However, the accuracy of meter wave radar is not enough." someone put forward this view.

"Yes, the accuracy of the meter wave radar is certainly not enough to guide our missiles," Qin Guan said. "However, we can solve it by technical means."

What do you find useful? Pull the air defense alarm? We should not only be able to find, but also attack each other. This is OK. The accuracy of meter wave radar is not enough. How can we solve it?

"We are divided into two situations." after Qin Guan said it, his mind was very broad: "at sea, we need to add a meter wave radar on our aegis warship, use meter wave radar to provide general direction, and then use our phased array radar to find it and guide missile attack at the same time."

Qin Guan's way of saying it immediately brightened everyone's eyes. Yes, to say that a stealth aircraft should actually be called a low detectable aircraft. It's difficult for radar to find it, but it doesn't mean it can't be found. If a large number of radar beams are concentrated there, it will be found.

"On land, we can do the same. Our land also has similar systems. We can use this method. The meter wave radar finds the target and the red flag nine system attacks. Of course, there are other ways." Qin Guan continued: "We can also deploy several meter wave radar stations separately, and then network them. Through the calculation of the computer system, we can greatly improve the accuracy and even meet the needs of guiding missiles."

One radar can't locate accurately. What if there are several? Several stations can be networked. After networking, the accuracy can be improved through computer calculation.

Most importantly, ordinary meter wave radars, which are two coordinate radar systems, can only provide azimuth and can not provide altitude information, so they can not guide missile attacks. After networking, the third altitude can also be measured.

This is another scheme. Now Han has advanced electronic technology, which can completely realize this kind of operation.

"These are the simplest and most direct schemes. There is also a complex scheme, and the effect should be better." Qin Guan looked at the people and said, "that is, to study meter wave phased array radar."

"Mibo phased array?" hearing Qin Guan's words, the radar experts present were stunned. Is this possible?

"Yes, it's the meter wave phased array radar." Qin Guan said, "moreover, it's still the active phased array, the three-coordinate phased array. It's the best land air defense radar system that can make all stealth aircraft have nowhere to hide. To say the disadvantages, its only disadvantage is that it's too big!"