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"In fact, the stealth fighter technology of the US military is not unbreakable, this is just a kind of propaganda by the Americans, and the object of the war of the US stealth fighter has always been a small and weak country, which has also caused a one-sided situation, if they meet Russia head-on, they know that it is actually very difficult for this fighter to be invisible." One of the directors of the laboratory explained to Fan Wuxian.

"Oh, I see—" Fan Wuxian nodded.

In fact, there is one of the most important anti-stealth radars, which was invented during World War II and is still in use today, and these are mostly VHF and UHF long-range anti-air reconnaissance radars.

Most low-detectable devices use technology to protect against detection by search radars and fire control radars at centimeter wavelengths, while VHF and UHF radars are radars with wavelengths in the decimeter to meter range.

"In general, the radar cross-sectional area of an aircraft increases as the wavelength of the irradiated radar increases. In addition, when the radar wavelength is in the same order of magnitude as the aircraft or a component of the aircraft, the radar waves resonate with the aircraft, thereby expanding the radar cross-sectional area of the aircraft. Longer wavelengths and resonance phenomena make it possible for VHF and UHF radars to detect stealth aircraft. However, due to the low resolution of the reconnaissance angles and distances of these two radars, they cannot provide accurate aiming and fire control information. The experts in the laboratory showed the schematic diagram on the computer screen and introduced Fan Wuxian on the other.

In fact, Fan Wuxian also knows nothing about this, although he has learned some ordinary physics before, but it is obviously not enough to put it here, but if you want to listen to the experts explain the principle, you can still understand it.

After the Gulf War, the Russian radar industry began to take various measures to digitally improve the VHF and UHF radar systems in order to improve the anti-stealth capability of such radars. Now, the resolution and signal processing capabilities of the old Russian radar have been greatly improved, and some newly developed radars, such as the Nebo vehicle-mounted VHF adaptive electronically scanning array radar, may have great anti-stealth capabilities, but they have not yet been reflected in actual combat, and no one knows what is going on in small countries.

Other newly developed conventional radars may also have anti-stealth capabilities, such as Lockheed Martin's theater high-altitude area air defense radar and Israel's Green Pine radar system, which have a long detection range and high resolution in the ultra-high frequency band.

"Another anti-stealth technology is infrared optoelectronic systems, including infrared search and tracking and high-magnification optics, which detect restricted airspace and must be guided by other sensors. In addition, the detection effectiveness of infrared photoelectric is greatly affected by cloud layer and low luminosity. Stealth aircraft can respond to infrared optoelectronic equipment reconnaissance through thermal signal management, stealth flight profiles, and low-detectability technology coatings. The expert explained to Fan Wuxi, "In fact, the F-117 of the Americans in Serbia was used in this technology." ”

Another anti-stealth technology with greater potential is millimeter-wave imaging equipment, which applies radio signals naturally emitted by all targets. Millimeter waves can penetrate clouds and low-visibility areas, radars can transmit waveforms, the -64 Apache Longbow Hellfire system is a typical example of millimeter-wave radar, and it is said that the Russian defense industry forces are already developing millimeter-wave anti-aircraft missile seekers, and several other major powers are also carrying out similar research.

In general, although some technical equipment has strong anti-stealth capabilities, they have some shortcomings that limit the effectiveness of air defense, traditional radars are vulnerable to electronic warfare and air-to-ground weapons reconnaissance and attack, listening systems cannot provide tracking information, and infrared optoelectronic and micron wave systems have relatively limited reconnaissance effectiveness.

"In contrast, passive radar has strong stealth capabilities, can operate in all-weather conditions, can advance medium-range and long-range reconnaissance activities, and has strong potential for reconnaissance, tracking and targeting stealth aircraft. Therefore, it is the most powerful technology in anti-stealth technology. Finally, the expert summed it up.

Fan Wuxian nodded again and again when he heard this, but he muttered a little in his heart, saying that this thing is a matter discussed by experts, and talking about it with himself is a bit like a Mongolian person, who knows if these technologies can work and whether they can be used in actual combat?

However, he immediately noticed a question, "Since the anti-stealth technology has been strengthened, future fighters may have nothing to hide, so is there still a market for researching stealth technology?" ”

"Mr. Fan, there are indeed many people who mention this question." In fact, recently, because of the downing of the F-117, many people think that since such advanced stealth fighters have been shot down, what is the use of studying stealth technology?

On the contrary, the downing of the F-117 over Yugoslavia shows the United States the importance of stealth technology. The United States has made stealth technology a top priority, such as purchasing new stealth fighters or improving stealth fighters. In short, stealth technology has become the core means of the United States to seize air supremacy.

"As stealth systems become more common, the number of non-stealth systems decreases. Stealth technology is more commonly used in newly developed military aircraft, ships, and ground combat systems. Countries around the world have invested heavily in the research and development of stealth technology. Since the US Air Force will retire all F-117 fighters in a few years, the US Air Force is now short of stealth combat aircraft. The expert explained to Fan Wuxian, "At present, the US Air Force is equipped with 20 B-2 bombers and nearly 200 F-22 fighters, and the joint strike fighter is expected to be equipped with troops in 10 years." According to the plan, the United States will purchase more than 2,400 joint strike fighters, and the delivery cycle will be as long as 30 years. At the same time, Russia, China, India, Japan and other countries are developing stealth fighters. All in all, there is a great demand for stealth technology in various countries and the technology is constantly evolving. ”

Fan Wuxian nodded after hearing this, "Demand is the market, the market is profit, it seems that the future prospects of our company are still very bright, at least we can develop some stealth fighters and sell them to some small countries for some money to spend." ”

As soon as he said this, the experts immediately stopped talking, probably because everyone has not yet adapted to this change in the system, and for some top-level military technology, China still habitually chooses to digest and absorb itself, and has never considered commercializing advanced technology and then selling it to foreigners.

Seeing that everyone seemed to be suspicious, Fan Wuxian snorted and said, "Our country does not engage in hegemonism, nor does it bully small countries, this lack of actual combat atmosphere to test new weapons, relying on the military itself to fight back and forth, obviously will not be effective, and in the end it can only lead to an overall decline in military technology, and the gap between the United States and Russia is getting bigger and bigger, so selling arms in the future is an inevitable path for us to take." Isn't it true that the Americans fight wars all day long in order to maintain their military superiority, and at the same time make money by selling some arms? ”

After listening to Fan Wuxi's words, everyone also felt that this was the case, but even if the company developed advanced stealth technology or anti-stealth technology, it would take time to use it in actual combat, and it would take more time to finalize it and put it on the market.

I just don't know, after the product is marketized, can it really be sold abroad for actual combat as Fan Wuxian said? If you can achieve this goal, making money is secondary, first of all, you can also see how the actual effect is, and make corresponding improvements.

The technological progress of weapons of war is indeed inseparable from the test of actual combat, and this is also a reality.

Later, Fan Wuxian visited a series of laboratories to learn about the progress of stealth technology.

Put simply, stealth is achieved through a series of technologies that make a platform difficult to detect and attack. In general, it requires a reduction in the aircraft's active and passive signal characteristics. Active signals are all visible signals emitted by the stealth platform, whereas passive signals are all visible signals emitted by the stealth platform under external irradiation. Low probability of interception techniques are generally used to reduce active signals, and low detectability techniques are generally used to reduce passive signals.

If the aircraft could be detected by infrared sensors at a distance of twenty kilometers, efforts to make the aircraft invisible at five miles were futile, and designers focused more on reducing the signal emitted by the aircraft's radar and infrared sensors.

By improving the shape of the fuselage and reducing the radar cross-sectional area by adopting radar absorbing materials, the fuselage can reflect the radar signal and deviate it from the direction of the transmitter. The improvement of the fuselage shape is mainly for the traditional radar, the receiver and transmitter of the traditional radar are configured together, and it is less effective in the transmission and reception of separate radars, and the radar absorbing material enhances the stealth force of the fuselage by absorbing the radar energy and reducing the intensity of the radar echo.

At present, the technology in the laboratory is mainly to study the stealth aircraft to actively cancel the radar echo by rebroadcasting radar energy or ionizing the boundary air around the fuselage, but this is indeed more difficult.

Fan Wuxian was quite emotional after the visit, but the skin he got on the Kursk a while ago did not appear in the research of Southeast Heavy Industry, according to Minister Zhang of the General Armament Department, this matter is very important, and the strategic nuclear submarine is the country's dry city, very important.

Therefore, all the research work related to nuclear submarines is done by the military itself, and as for the stealth technology of fighters and anti-stealth technology, etc., the military has let Southeast Heavy Industry do it, and even provided a lot of existing research successes for their reference, and they are optimistic about the success of these technical studies.

After Fan Wuxian learned the news, he still felt a little regretful, after all, the nuclear submarines of the British and Americans were all provided by private arms dealers, and this is the gap.

It seems that there is still a lot of work to be done in this area, but now it seems that it has taken a welcome step.

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