Intending to make a long scientific speech, Long Yun paused first and took two sips of tea.

"First of all, you probably already know that in order for the missile to detect infrared radiation from the body of an enemy aircraft, the seeker needs to rely on infrared sensors. According to the different working media and structure of the sensor, from the early 'lead sulfide', later 'indium antimonide' to the current 'mercury cadmium telluride', the infrared wavelength band that can be detected is getting wider and wider, and at the same time, it is becoming more and more sensitive.

However, combined with the background analysis of the subject, limited by the military science and technology level of China and Soviet Russia, the infrared seeker that could be put into practical use in the early nineties was still in the era of 'cooled indium antimonide sensor'; the infrared induction peak of this sensor is at a wavelength of 3~5 microns, while the radiation energy in the 3~5 micron band is actually very small in the frontal infrared radiation signal of a fighter jet. Because of this situation, the interception distance of the seeker made of the cooled indium antimonide sensor on the head-on target is much lower than that of the tail-chasing target. ”

"...... 'Chrysanthemum'?"

"-Ah, no, nothing! That is to say, you can only tail chase the attack, that's all, hehe......"

didn't want to explain this very vulgar word to the girl in front of him, Long Yun wiped a little cold sweat from his forehead before continuing his explanation:

"Ling, think about it, if the missile can only tail chase and attack the enemy plane, is it very passive when the enemy and us are close to each other? Of course, if you have to use this type of missile to intercept it head-on, it is not impossible, but the probability of interception of enemy aircraft by the homing head has dropped significantly, and in most cases this is a way of trying your luck.

It is necessary to improve the head-on attack capability of infrared-guided missiles. Sensors of different materials can be used. For example, mercury cadmium tellurium sensors with induction peaks in the 1~24 micron band; But first, this sensor is based on the technology of the nineties in China. The yield rate of manufacturing is very low, the price is also outrageously high, and secondly, due to the broadening of the sensor detection band, the required circuit design is more complex, and the signal processing complexity is also greatly improved, which is also difficult to achieve at the level of science and technology at that time. ”

"So, according to what you said, in a word, that is, due to the limitations of the technology at that time, our infrared bombs can basically only pursue enemy aircraft? - Then I kind of understand the undesirable point of doing this. If you want to fight in the air, you always approach each other head-on at first, right? ”

"yes, most of the time. Therefore, due to the limitations of the technical level at that time, infrared bombs could not completely replace semi-active bombs for combat missions. Of course, when it comes to the reason, I have to mention another disadvantage of the infrared bomb, that is, the self-homing head of the missile head needs to have a hemispherical transparent cover, which will greatly increase the shock wave resistance of the missile when flying at high speed. Just like the R-27R/R-27T series missiles we imported back then, although the two models have exactly the same missile body, the range and maximum speed of the infrared R-27T are not as good as the radar type R-27R. ”

"Oh...... Hearing you say that, I kind of get it a little bit clear. ”

Although little is known about warplanes and missiles. After all, he also has the foundation and bright mind of a highly talented student in science, and Shangguan Ling blinked his eyes with interest. After thinking for a while, I came up with a little idea of my own:

"So, if the infrared bomb is not good, I still have an idea to use a missile with a longer range than the enemy's active bomb to hit the enemy, is this okay? Since you talked about the range of missiles, the range of the infrared type is not comparable to that of the radar type with the same conditions; Then let's not consider infrared bombs, isn't there another kind of 'semi-active radar-guided missile' with an increased range? Is it possible to shoot down enemy aircraft if semi-active shells with a range that exceeds the enemy's active projectiles are used? ”

"Oh? - You mean,"

As soon as she heard her way of coping, wasn't she talking about a big guy like the R-27ER, Long Yun poured a little spirit, "Even if we only have semi-active bullets, as long as the range of this semi-active bullet exceeds the enemy's active bullet, we can hit the opponent first, but the opponent can't hit us, right?" ”

"Well, that's it, isn't the reason very simple?"

"Hehe, this ......"

Hearing Shangguan Ling's seemingly reasonable, but in fact ill-conceived words, Long Yun put on a scheming look and smiled, he knew that the point that the eldest lady had just said was one of the misunderstandings of air combat that had been repeatedly raised on the Internet and in the community, but novices often couldn't figure it out.

"Let's put it this way, I probably understand what you mean, that is, use semi-active bombs with a certain advantage in range to shoot at enemy aircraft, and strive to be the first to discover, launch, and destroy first, right? It's like the enemy has a pistol, but we have a rifle, and then we can unilaterally kill and injure the enemy with the advantage of range, isn't it?

But what you don't think about is that this line of thinking has a glaring omission.

The reason why this method of operation is not feasible is that the active missile used by the enemy aircraft does not need it to provide irradiation at the end of the missile's approach to the target. In other words, even if we preemptively launch the R-27ER to attack the enemy aircraft and successfully hit it after a while, the active bombs launched by the enemy aircraft are already approaching, and we still need to face the threat of active bombs at this time.

Of course, the specific calculation of this process is more complicated, and you can calculate it slowly, but I can roughly say that if the semi-active projectile wants to use the range advantage against the active projectile, the range index generally needs to be more than one or three times that of the latter, which is actually beyond the technical level of China at that time. Even the R-27ER, which has an effective range of 75 kilometers, is still unable to fight against the AIM-120B, which has an effective range of more than 60 kilometers, is one of the reasons. ”

Speaking of this somewhat helpless reality, Long Yun's tone also became a little stern, this situation was not interesting at all in the eyes of the Chinese Air Force at that time. In this case, facing the threat of active bombs is nothing to him Long Yun, he and air-to-air missiles have always been old friends who are easy to talk about; But for ordinary pilots, the implementation of such tactics is often the result of the same death as the enemy aircraft.

"Oh...... Yes, is that so......"

Hearing a completely novel theory, those numbers and analyses that were originally hidden between the lines of the information and were often obscure, but they were clearly understood by the man in front of them.

"But—why do you want to make me think about a question that has no answer!"

"Ahh

"I've been reading it for a long time and I've searched a lot on the Internet! - Of course, it's true to say that you have learned something, but you say this," to Long Yun's surprise, Ling said as he took out his tablet and showed him some naïve but serious analysis patterns he had made, "Isn't that like someone who solves the problems of 'turning a circle into a square' and 'doubling the cube', I am thinking in vain about questions that have no answers?" ”

Hearing Shangguan Ling's words, Long Yun took the computer in her hand very curiously, opened his eyes and looked at it for a while, he felt that this girl's homework was really good, at least better than many amateur military fans. But to say that "I am fooling her in vain" is a misunderstanding, he put down the computer and looked directly at the beautiful eyes of the girl in front of him:

"That's not what you say, well, how should I say it, can I say that you didn't do your homework carefully? In fact, in addition to 'semi-active radar guidance' and 'infrared guidance', there are still weapons to deal with active projectiles. - Did you see that? ”

After a pause on the computer, he found the corresponding introduction page, and Long Yun sent it to the eldest lady:

"With anti-radiation missiles, some kind of Cheng dù can do it."

"Anti-radiation...... Missile? ”

Hearing Long Yun's words, Shangguan Ling's eyes widened in surprise, she didn't quite know what he was talking about.

Anti-radiation missile, this term is not unfamiliar to the ears of most military fans.

If you want to ask anyone who can say a thing or two about this, you will mention HARM (High-speed Anti-Radiation Missile), this kind of transliteration "Hamm" air-to-surface anti-radiation missile in the 1991 Gulf War made a big splash, relying on the successful performance of F-4G "Weasel" fighters, "Hamm" missiles destroyed a large number of Iraq's air defense warning radars and ground-to-air missile guidance radars, The greatest obstacle was cleared for the massive air strikes of the multinational forces.

However, here, the "anti-radiation missile" that Long Yun mentioned is not an air-to-ground missile, but an anti-radiation weapon used in air combat; This air-to-air missile, named R-27P, is guided by the method of detecting the radiation signal of the enemy's radar, and its combat mode is completely different from that of ordinary air-to-air missiles.

Seeing that the eldest lady in front of her was completely unaware, Long Yun introduced the R-27P missile to her in a few words, and roughly explained the guidance principle of the missile. After listening to Long Yun's description, perhaps thinking that this missile had no problem dealing with enemy planes at all, Shangguan Ling put down the tablet in his hand with some ease, and sent a charming smile to Long Yun that understood and was taught:

"Oh! That is true. - Well, I blamed you wrongly; I'll take a closer look when I have time back. ”

After listening to Long Yun's explanation (in fact, it is still considered illiteracy), he probably thought that this missile was very interesting, Shangguan Ling, who had ended this discussion, took the computer and looked at it again, and then put it away with great satisfaction, raised his hand to pull down the soundproof curtain, and beckoned Su Xue across the aisle to come and sit together, and the two talked and laughed quietly, as if they were ready to start playing chess.

Seeing that the two girls were ready to have fun, Long Yun got up to give up his seat to Su Xue, he walked a few steps in the aisle, relaxed his legs and feet, and then came to the window seat and sat down, looking at the vast expanse of blue outside the window.

In the conversation just now, he didn't actually say it all:

Whether it is the Chinese Air Force at the end of the last century or the Soviet Union in a parallel world, if you want to use anti-radiation air-to-air missiles against the American AIM-120, only the R-27P is not enough. (To be continued......)