Chapter 387 Let's make a big change

Gao Zhendong wanted to give the final solution directly, something simple and direct, but the comrades in the Research Institute couldn't stand it.

I clearly know there are several other ways, but Gao Zhendong skipped them all. How can I tolerate this?
Even if it cannot be used on this bomb, it can still be used to polish jade and broaden ideas. Even if the technical solution is outdated, you can listen to it. Maybe it can be used somewhere else someday.

Not to mention that the essence of many solutions lies not in the specific technology, but in the ideas and methods of solving problems.

Besides, the plan proposed by the senior consultant shouldn’t be outdated, right?

The chief model designer of the Institute of Advanced Technology could not help but say, "Come on, Senior Advisor, tell us about the others as well. Don't skip over them. We all want to hear about them."

The other people in the Guidance Research Institute, especially Engineer Lu who was in charge of guidance, nodded quickly and said yes, yes, yes.

The two members of the Defense Work Committee couldn't help but burst out laughing.

These people are so damn interesting.

Gao Zhendong had no choice but to introduce the other types and explain their shortcomings one by one.

Conical scanning, also known as frequency modulation, is better than amplitude modulation. The plate does not rotate, but the secondary reflector rotates. The signal is reflected to the sensor through the modulation disk through the rotation of the reflector. When the seeker is facing the target, the output signal is uniform. Once it deviates, the signal width and frequency will change, thereby guiding the missile.

But the biggest problem with this thing is that its ability to resist background interference is even worse than that of AM!
The four-quadrant detection seeker divides the sensor into four pieces. The difference in signal strength on the four sensors indicates the target direction. It looks a bit like a four-element orthogonal detection seeker, but they are actually two different things. The former is controlled by signal amplitude, and the latter is controlled by signal frequency. If you have to say, the four-element orthogonal and the frequency modulation dial are more closely related.

The problem with this thing is the same as cone scanning.

Rose line scanning uses a small field of view sensor to scan the entire detection area. It is a guidance technology of almost the same generation as the orthogonal quaternion. In terms of effect, it is better than the orthogonal quaternion and can even perform sub-imaging. It is worse than the focal plane array, but stronger than the others.

But the biggest problem with this thing is that the system is complex, requires high costs and is high. Although it is lower than the focal plane, it is expensive compared to other principles.

The main mirror of the whole system needs to rotate forward, the secondary mirror needs to rotate reversely, and there is an eccentric mirror at the back. Not to mention the mechanics, the optical system is troublesome enough, and the scanning stability requirements are very high. For this era, it is a bit excessive. There is also a problem of interception probability. If it rotates too slowly, the probability is low, and if it rotates too fast, the system requirements are high.

However, the comrades from the Guidance Research Institute don’t care about these things. They just write them down first. Different methods can be used on bullets with different requirements.

Although this was a simple explanation, it still took Gao Zhendong more than half an hour to finally get to the point, quaternion orthogonal scanning.

The structure of this guidance head is actually similar to the conical scanning head, but the modulation disk is removed and the sensor is replaced with four orthogonal strip sensors to form a cross, with each side of the cross being a sensor.

The output signal is a pulse signal, which looks similar to conical scanning. If you only want to control the direction of the missile, you can directly use the output pulse signal for control.

When Engineer Lu heard this, he had a question: "What is the difference between this method and the previous one? Cone scanning cannot distinguish multiple light sources, so how can this be distinguished?"

Gao Zhendong smiled and said: "The mirrors of the orthogonal quaternion also rotate, but the rotation of the primary mirror and the secondary mirror is done together, so the mechanical part is much simpler, there is no eccentric mirror, and the optical system is also simple. As long as the rotation speed is constant, the scanning stability requirements are not high. All these combined, its comprehensive performance is the best at this stage."

"As for distinguishing multiple light sources, this method can automatically generate a baseline reference signal by rotating the primary mirror, and combined with the scanning signal, it can obtain the ability to distinguish multiple light sources."

Even for detectors of this structure, even if laser interference is used, it is difficult to interfere with it with continuous laser unless it is directly burned through with high power. Pulsed lasers must be used, and the frequency and duty cycle of the interference source must also be considered, which makes it very difficult for the interference party.

Orthogonal four-element detection is a common detection principle used by third-generation air defense missiles. This also includes the Russian R-73, a missile famous for its off-axis launch angle, but the Russians use an L-shaped two-element array, and the actual principle is similar. In this regard, we really have to admire the Russians, who can always use seemingly ordinary basic technology to play various tricks.

The comrades from the Institute of Guidance and Research followed Gao Zhendong's line of thought and couldn't help but applaud.

The beauty of this solution is that it is all structural adjustments, but does not require high technology. It removes the troublesome modulation disk, and at the same time greatly improves the performance and anti-interference capability of the entire guidance system.

It can be said that the technology that can make an amplitude modulation disk seeker can also be used to make an orthogonal quaternion seeker.

Engineer Lu shook his head and said, "Advisor Gao, your idea is absolutely brilliant! The technology is not complicated, but it is very effective in solving problems. What is it called? Oh, right, great ingenuity without effort, great ingenuity without effort."

Although the orthogonal quaternion detection seeker did not appear until the era of indium antimonide seeker, it does not mean that it can only be used on indium antimonide seekers. In fact, it is just a coincidence in the time of technological development. The two are completely two different tracks.

The principle of this method can also be used to refrigerate lead sulfide.

The two people from the Defense Work Committee looked at Gao Zhendong with complex expressions, including satisfaction, surprise, solemnity, and joy.
The chief designer of the air-to-air missile model thought for a while and asked a question: "What are the shortcomings of this method?" Gao Zhendong also thought about it and said: "For the current stage, there are no shortcomings. If you have to say shortcomings, there are two."

Everyone perked up and became very interested in the defects.

"First, if you want to give full play to its anti-interference ability, the requirements for the guidance and control system are a bit high. It is best to have a certain computing power, otherwise the multi-target resolution ability will not be very good."

If you want to distinguish multiple targets based on the reference signal and the scanning signal, combined with the solution, the analog circuit is a bit difficult or very costly.

This is probably the reason why this technology only came to prominence with the third-generation infrared air-to-air missile, as there were no computers before.

When everyone heard this, they realized that this was it. That’s all right. What is your DJS-60D for?

"Then I'll have to ask the senior consultant to lend a hand and re-arrange the board of your DJS-60D."

Currently, the smallest unit length and width of DJS-60D is about 25cm, and it needs to be made smaller. The diameter of the infrared air-to-air missile is only half of this number.

"What about the second flaw?" asked Engineer Lu.

"In fact, the second flaw is not a flaw in the orthogonal four-element detection principle, but a flaw in the infrared sensor itself. The problem is that the sensitivity is still not high, so even if this method is used, the improvement in head-on attacks is still very limited and still cannot reach a usable level. However, it is still no problem to further improve the distance and success rate of rear-hemisphere attacks."

When the comrades from the Institute of Guidance and Research heard this, they were half disappointed, but then they became excited again. They were greedy, weren't they? Without any major technical changes, they could solve the anti-interference problem. What else could they want?
Being able to improve the distance and success rate of the second half of the ball is already a significant improvement.

The chief engineer of the Defense Work Committee smiled and said, "This is not a big problem, Comrade Zhendong. There is nothing wrong with the technologies you have provided. If there are any problems, they are all problems with our defense work system. The sensors are not good enough and are not worthy of the good solutions you have provided us."

These words made the comrades in the Institute of Advanced Studies blush. Oh, it's so embarrassing!

But when you think about it, weren't we taught others how to make lead sulfide refrigeration and rocket engines?

Forget it, I’m used to it. He’s our technical consultant, one of us. It’s not shameful.

Gao Zhendong sat there with a happy look on his face, which made the leader of the Defense Working Committee feel moved.

This kid, looking at his expression, is there an ambush?
The leader looked at him and directly exposed his true colors: "Zhendong, I see that you look like the sensor can do something?"

Hmm? After hearing what the leader said, everyone turned their attention to Gao Zhendong.

Yes, you know there is a problem but you can still laugh like this. No, there is a situation.

Seeing that everyone was looking at him, Gao Zhendong felt a little embarrassed: "Yes, yes, in fact, I think that the current Thunderbolt-1 does not need minor modifications. It has low cost and good performance. It can be used by ourselves and can also be used to support others. What I just said, plus what I am going to say next, modify the missile body, spend more time, and come up with a major modification model. This will not disrupt the rhythm of scientific research and equipment."

The missile body must be modified, otherwise the G value cannot be increased, and the guidance head that we are going to use will be wasted. It should at least be modified to the level of the third-generation infrared air-to-air missile.

The seeker structure has been changed, the infrared sensor has been changed, the guidance computer has been changed, and the missile body structure has also been changed. If this is not a major change, then what is it?

Seeing him directly mention the major model change, everyone was excited, which showed that he was very confident in what he was going to bring out! Otherwise, he would not have brought this up.

"Wait, clear the area again!" The leader of the Defense Work Committee asked him to stop again. Thinking about the specific names and compositions of the materials that might be involved, it is better to be careful. Anything can jump out from Comrade Zhendong's place.

This time there were only six people left, including the leader of the Defense Working Committee, the chief engineer, the chief model designer of the Research Institute, Lu Engineer, Gao Zhendong, and a comrade from the Flying Army.

After the area was cleared, the leader looked at Gao Zhendong.

"Tell us quickly, as long as the product is good, we can give you a major revision or even a new model." The leader of the Defense Work Committee's eyes lit up and he was very straightforward.

　There is one more chapter today, I will post it in the afternoon. I will start with the part about leaving the city in the morning, haha

　　
　
(End of this chapter)