In the future life when Xu Yun traveled through time.
Due to some well-known reasons, many technologies in China's industrial development field have been stuck.
For example, take the chip that everyone is familiar with.
The chip manufacturing process is extremely complex, but it can be summarized into several major steps:
Silicon wafer preparation → epitaxial process → thermal oxidation → diffusion doping → ion implantation → photolithography → etching → process integration, etc.
The photolithography process is the most critical step in the manufacturing process.
Photolithography determines the critical dimensions of the chip and accounts for approximately 35% of the overall manufacturing cost in the entire chip manufacturing process.
At present, the domestic lithography level lags far behind the international level, which is why when talking about chips, lithography machines must be mentioned.
But if we really talk about technologies that have been severely outdated and stuck - this refers to the situation where both military and civilian applications are stuck at the same time, the chips are not that advanced.
Firstly, this is because military chips are not as demanding as civilian chip standards.
For example, the basic process requirements for military chips across the sea are only around 65nm, and Rabbit is actually not far behind in this regard.
The xxxx soul core 2#A chip used in J20 is even second to none in the world.
With military supplies at the back, the degree of chip jamming is lower than it seems.
The second is...
The spread of some technologies may not be high, but their actual degree of obsolescence is countless times worse than that of chips.
The simplest is the gravity gradiometer mentioned before, which has been trapped in both civilian and military applications.
Another example is the vacuum evaporation machine that few people know about.
This thing is the "heart" of the OLED panel manufacturing process, and the entire industry is dominated by neon's Canon Tokki in the high-end market.
To what extent is China stuck?
This level is so exaggerated that before 2019, there was not even one domestic company that produced vacuum evaporation machines.
Even now, 19 years later, there are only two companies except Ryder Equipment and Zhongshan Kaixuan Vacuum Technology.
Although it can be mass-produced, there is still a clear gap between it and the international level.
To know.
OLED panels are not like ballpoint pen tips, a technology that has no market and rabbits are too lazy to break through.
At present, its annual demand has increased to 420 million pieces a year, which belongs to a very large business category.
In addition to gravity gradiometers and vacuum evaporation machines.
The rabbits also have something that even the military supply field is stuck on, and that is...
Industrial software.
So-called industrial software.
It refers to application software used in the industrial field to improve the R&D, production, management level of industrial enterprises and the performance of industrial equipment.
Its core role is to help industrial enterprises improve quality, increase efficiency, reduce costs, and enhance the competitiveness of enterprises in high-end manufacturing.
for example.
The chip manufacturing mentioned above.
Nowadays, chips the size of fingernails integrate billions of transistors. If engineers were to draw this kind of workload by hand...
Well, let’s not talk about whether the drawings can be used.
By the time you finish drawing all the billions of transistors, Conan will probably be finished.
Therefore, if you want to develop chips, you must use industrial software for assistance.
At present, industrial software can be divided into three major categories according to functions:
CAD (Computer Aided Design),
CAE (Computer Aided Engineering),
CAM (Computer Aided Manufacturing).
These three software are indispensable software in today's industrial industry. They are indispensable for the research and development of aviation, ships, automobiles, chips and other products.
But it's a pity.
At present, China does not have much say in the field of core industrial software, and has been severely squeezed out.
The market is occupied by Dassault Dassault, Germany's Siemens, Haidian PTC and Haidian Autodesk, accounting for more than 95% of the market share.
Once overseas stops software licensing, many domestic companies will suffer a major blow.
For example, Huawei.
At that time, due to cross-border sanctions, Huawei suddenly ran out of chips, and the p50 could only use 4G.
And throughout the sanctions.
It seems that the most severe sanction clause is to prohibit Huawei from cooperating with radio frequency chip manufacturers, but in fact the most severe measure is another penalty:
Terminate Huawei’s cooperation with overseas EDA software manufacturers.
The EDA software here is also a kind of industrial software, and its full name is Electronic design automation.
That is electronic design automation software.
It is an industrial software mainly used to design very large-scale integrated circuits. The principle is almost the same as the transistor design mentioned above, no matter how complicated it is.
If the cooperation between Huawei and TSMC is terminated, Huawei can also find other manufacturers to manufacture some low-end chips.
Then terminating EDA software is almost equivalent to taking a huge blow to Huawei, and directly cutting off the chip path from the upstream design field.
And the original Harbin Institute of Technology.
In May 2020, Harbin Institute of Technology received a notice of termination of the software authorization of MATLAB...that is, the matrix laboratory.
This means that Harbin Institute of Technology no longer has the right to use genuine MATLAB.
MATLAB stuff is an extremely powerful engineering artifact. It is no exaggeration to say that without it, the efficiency may even be twice as bad.
In the future life when Xu Yun traveled through time.
Domestic industrial software can be said to be in darkness, and the glimmer of hope is even lower than when the national football team entered the World Cup.
The main reason for this situation is that domestic products are not very easy to use, and there is a gap between them in terms of experience and efficiency compared with foreign products.
People must pay attention to efficiency and profitability when running a business. It is impossible to risk losses and become a guinea pig for industrial software manufacturers-unless it is the same faction behind it...for example, the University of Science and Technology of China and Fudan University.
enterprise.
But even for that kind of enterprise, it will only be used by one or two departments or project teams at most, and it is impossible to cover all R&D departments.
This is a very normal business logic, and there is no way to blame others for not supporting domestic production.
This chapter is not finished yet, please click on the next page to continue reading the exciting content! But on the other hand.
The actual reason for this situation is that the domestic related industry started too slowly, and it is far behind the foreign countries by who knows how many positions.
That is to say, as the saying goes, if a movie is slow, everything will follow suit.
Many of the problems that appear in domestic software have actually appeared in MATLAB and so on, so why can they survive until now?
The reason is that they run fast and there are no competing products to choose from when something goes wrong.
Therefore, when the weather Doppler radar solution was proposed.
Xu Yun deliberately laid this foreshadowing:
Want to calculate the deflection angle?
Want to develop airborne Doppler radar?
no problem.
Then go digital!
All classmates who are Chinese in this life should know this.
The Chinese nation has had a special quality since ancient times.
That is, as long as you let it taste the sweetness in a certain aspect, it will spontaneously go deeper in that direction.
True.
Due to various objective circumstances, not all of the "seeds" planted by Xu Yun may grow.
But only a few can germinate.
Xu Yun...or the rabbits are making a lot of money.
If all goes well...
Maybe in this world's timeline, the rabbit might get stuck in someone else's neck?
Oh, wrong, wrong.
How could a peaceful rabbit get stuck in its neck?
So it should be said differently.
For example...
Have subjective superiority in a certain field?
Well, that sounds much better.
Of course.
At this time, although Xu Yun and Sun Junren both cared about Xiao Jiujiu, neither of them showed it openly.
A person is like a harmless person who is just recovering from a serious illness. Ask and say whatever you want, and never cross the red line.
The other person looks like a weathered old worker, simple and honest, and only cares about the theoretical issues at hand.
Lao Guo on the side felt that something was not right.
However, due to the huge professional differences, I just had some feelings...
More than ten minutes later.
Sun Junren shook the manuscript paper in front of him twice like a doctor reading a CT report, and said to Xu Yun with satisfaction:
"Comrade Han Li, thank you very much for your hard work."
"With your answers, some theoretical questions finally have answers."
"To tell you the truth, on the way to the base, everyone was almost unable to sleep due to these problems, just waiting for the results."
Sun Junren's words were really not polite.
The issues in his hand were compiled from various groups in the Ten Academy, and the team had already conducted many rounds of discussions.
Throughout the discussion, some simple doubts had already been screened out.
The questions that Sun Junren can ask Xu Yun are basically the common questions of everyone - no matter how bad they are, they are the kind of controversial ones.
Now that we can get the answer from Xu Yun, it can be regarded as a matter of concern for everyone.
Then Sun Junren carefully put away these manuscripts, took out a small bowl of watermelon from the tent and placed it in front of Xu Yun:
"Comrade Han Li, thank you for your hard work. Come and eat some more watermelon."
"...."
The corner of Xu Yun's mouth twitched twice, he raised his head and asked Sun Junren:
"Gong Sun, you don't want me to answer any theoretical questions again, do you?"
"How can this be possible?"
Sun Junren immediately puffed up his chest and quickly denied it, but then he smiled and scratched his hair twice:
"The main thing is that I have something other than theory that I want to talk to you about - it's not a mathematical or theoretical problem that needs to be deduced. I don't know how to think about it, so we can chat while eating..."
"...."
Seeing this, Xu Yun sighed quietly.
Why do these big guys act like this?
The same goes for Faraday and the others in the original 1850 copy. They trapped themselves in...
Of course.
Look at it from the perspective of this era.
Being able to eat juicy watermelon at a place like Factory 221 is indeed a very rare thing, and it is enough to buy a lot of favors.
For example, in the original real history.
Academician Chen Nengkuan "bought" Academician He Zuoxiu with two imported cigarettes - friendly reminder, this boss is really not named He Zuoma...
At that time, Academician He Zuoxiu worked all night for four days to calculate the secondary chain peak value of the U3 branch of the light-core model for these two imported cigarettes.
To know.
In order to solve this problem, the people across the sea spent a full thirty thousand dollars.
In addition, Xu Yun had just recovered from burns at this time, and his body had a spontaneous desire for fruits such as watermelon.
So it's very fast.
Xu Yun decided to 'give in' to Sun Junren and nodded sharply:
"Okay, Sun Gong, just say whatever you have to say."
"If I can give an answer, I will try my best to answer you."
Sun Junren was waiting for this sentence.
Upon hearing this, he immediately thrust the small bowl into Qiao Caihong's hand, pulled up a chair and sat next to Xu Yun:
"Actually, it's nothing... It's just my personal curiosity. I just want to talk to you about your views on the development of radar."
"Didn't you come up with the principles of weather Doppler radar? I was wondering if you might have some new insights into radar."
"Comrade Han Li, do you think radar still has development prospects in the future?"
I heard this question from Sun Junren.
Xu Yun suddenly raised his eyebrows.
What a coincidence.
Originally, he was thinking about when to mention this to Sun Junren, but he didn't expect that Sun Junren came to the door himself.
To know.
This trend in the radar industry is different from the single category of carrier-based aircraft radar mentioned before.
This kind of 'big trend' involves many fields, so Xu Yun originally planned to find an opportunity to talk to Sun Junren about it.
After all, domestic radars these days are really trying to cross the river by feeling the stones, and they have been stagnant for many years. The reason for the stagnation has nothing to do with the background of the times, but that the rabbits have indeed gone the wrong way.
For example, the hydraulic drive of the fire control radar, which was criticized crazily by military fans of later generations, is relatively sensitive and I will not go into details.
At the same time, a very important point is.
This chapter is not finished yet, please click on the next page to continue reading the exciting content! From the perspective of future generations.
The development periods of radar are actually easy to divide and do not require much theoretical foundation.
These three important periods are:
In the early days of its birth and development,
period of great development,
The era of modern radar.
The birth and early stages of development were naturally during World War II.
During this period, radar technology with ground-to-air, air-to-ground bombing, air-to-air fire control, and identification of friend or foe mainly appeared.
The period of great development began in the 1960s and 1970s after World War II and lasted until the mid-to-late 20th century.
There were many new radars that appeared during this period.
For example, synthetic aperture radar, pulse Doppler radar, phased array radar, etc.
As for the modern radar period, it will naturally be around 2023. The current radar function has long gone beyond the scope of "radio detection and ranging" and has gradually begun to enter urbanization scenarios.
For example, smart cities are a representative example.
These trends have distinct stages and are not complicated to describe.
So Xu Yun quickly organized some words, thought for a moment, and said to Sun Junren:
"Gong Sun, in my opinion, radar research and development should be a very promising industry, and the current development is far from over."
Sun Junren raised his eyebrows, but his expression did not change much:
"Oh? What do you say?"
Xu Yun raised his eyelids, glanced at him, and said:
"You should know that the function of existing radar is actually very simple. To put it bluntly, it is to detect the target and give its distance and angular position in space."
"For example, the target is 114.514 kilometers away from us, the angle is 34 degrees northeast, etc."
"But in my opinion, this function is far from discovering the practical value of radar."
"I think a truly mature radar system should be able to conduct more detailed analysis of measurement targets."
"For example, if the radar has determined that the detected target is an aircraft, it needs to be further refined to determine its specific model."
"For example, small or large jets, small or large propeller aircraft, helicopters or missiles, etc."
Sun Junren was silent for a moment, with a trace of confusion in his eyes:
"It's a beautiful picture, but... Comrade Han Li, is this really possible?"
The situation Han Li mentioned was not unfamiliar to Sun Junren. This was actually the complete concept at the beginning of the radar design.
But the problem is...
Scientific research is not science fiction, it does not mean that if you think of a certain scenario, you will be able to realize it.
It's like the curvature engine of later generations.
All kinds of measures...that is, the solutions have been worked out for you, but there is still not a single horoscope...no, not even one ten thousandth of a digit.
What is the current situation of radar?
It’s almost the kind you see in movies:
There is a line on the instrument panel that rotates like a small colorful flag, then displays a small dot, and then disappears.
So after hearing Xu Yun's description.
Sun Junren was not too surprised, but a little confused.
What he is looking for is not a science fiction-like direction, but he hopes to see the possibility of implementation - it does not necessarily require detailed principles, but there must be some technical ideas, right?
But just when Sun Junren thought Xu Yun was also drawing cakes for him.
Xu Yun's answer suddenly sounded in his ears:
"Of course it's possible."
Sun Junren was suddenly startled.
After a while.
He raised his head in astonishment and looked at Xu Yun.
Xu Yun raised an index finger towards him with some difficulty and explained:
"As long as we can distinguish the various scattering centers on complex targets and finely process the echo signals to infer certain properties of the target, then there is a chance to achieve this step."
"For example, there are many parts on the aircraft, such as propellers, helicopter horizontal rotors, jet engines and tank tracks, rotating antennas, etc."
"They will all modulate the backscattered wave of the target, thereby forming its Doppler side lobes as identification features - this modulation signal can be extracted in both narrowband and broadband waveforms."
"These data, combined with lateral resolution, Doppler frequency and comprehensive multi-band analysis, should be able to achieve more precise goals, that is..."
"2D Radar Imaging."
Mentioned earlier.
When the range resolution of the radar is high enough.
It can distinguish different scattering centers in a complex target and give a radial profile of the target.
Then from the profile diagram, the length of the target in the distance dimension can be roughly estimated.
This is one-dimensional radar imaging, and the radars that have been launched in this era are also this type of technology.
This technology is much better than low-resolution electric radar and can obtain the target scattering point intensity distribution map.
Under normal circumstances.
An air surveillance radar with a range resolution of 1m can obtain 7 relatively stable profiles in the L-band, which can distinguish propeller aircraft from jet aircraft - and that's it.
So at this time.
Many radar experts believe that the road ahead is closed, and many have even changed careers on the spot.
For example, Vera Larson, the designer of Britain's first fire control radar, turned directly into an actor last year. In 1972, she was nominated for an Oscar, although she did not win...
But Xu Yun knew it very well.
One-dimensional radar imaging is far from the limit of radar.
Under the conditions of high signal-to-noise ratio, attitude angle changes, multi-image diversity synthesis, etc.
If the technology meets the standards, two-dimensional radar imaging will be the real mature technology of radar.
If we say that low-resolution radar is the button cell phone before 2010.
Then one-dimensional radar imaging is equivalent to Gionee Voice King and BBK Music mobile phones, which are transitional products.
Under the tide of the times.
The BBK Music Phone and the familiar ‘da la da la da’ theme song have become the tears of the times. Although Gionee Voice King is still alive, it has long withdrawn from the mainstream market.
Two-dimensional radar imaging is the real smart phone, it is iPhone6, it is Huawei mate30... its prospects are infinite.
It can also judge the load of the aircraft through the up and down bumps of the aircraft, thereby determining the carrying capacity of the aircraft.
even.....
Go one step further.
Think of this.
Xu Yun decided to draw another pie for Sun Junren. Anyway, the discussion was about prospects and not specific principles:
"Sun Gong, let me give you an example. Haven't we always wanted to regain the treasure island?"
"So you might as well imagine this scenario - one day Baodao's missile was accidentally fired. Within three seconds, our radar locked the model, launch area, and calculated its trajectory and expected landing point.
information."
"When it explodes, our trumpeter is already blowing the assembly horn...Hey, Worker Sun, why are you drooling?"
Hear Xu Yun's last words.
Bliss——
Sun Junren quickly sucked back the odor from the corner of his mouth, and his eyes lit up.
Even though Sun Junren is an expert in scientific research, in fact his background is inextricably related to the army.
He dare not say that he dreams day and night of "missing" the recapture of the treasure island.
But it is relatively normal to dream about playing mahjong in Kaohsiung once every five days.
Therefore, the picture drawn by Xu Yun can be said to have hit his target, making Sun Junren shed tears unconsciously...
"Is it two-dimensional radar imaging..."
After drying the corners of your mouth.
Sun Junren was silent for a moment and asked Xu Yun:
"Comrade Han Li, do you have any specific ideas in this regard?"
When Xu Yun heard this, he spread his hands neatly, shook his head and said:
"Gong Sun, you are just kidding me. Unless I am a person born decades later, how would I know this?"
"The best I can guess is that these should be related to the development of computers. After all, the amount of calculations is obviously impossible to achieve by humans, don't you think so?"
Sun Junren nodded.
In fact, he just asked casually and did not expect Xu Yun to give a detailed plan.
Actually.
Xu Yun's ability to propose the concept of two-dimensional radar imaging has opened up a new idea for him.
Think of this.
He couldn't help but secretly made up his mind:
When you return to the capital, you must try to demonstrate the effect of digital processing on radar holdings!
If there is real potential....
Then whatever he said, he would have to make a special report to his superiors.
...........
After a while.
Sun Junren glanced at the busy scene, pondered for a moment, and said to Xu Yun:
"Comrade Han Li, all in all, I really have a favor for you today."
"After talking to you like this, I understood what the ancients meant when they said that listening to what you have to say is worth ten years of reading."
"By the way, now I have to go to the base to check the situation. How about we go there together?"
Xu Yun quickly swallowed half of the watermelon in his mouth and spit out two watermelon seeds:
"OK."
have to say.
Although Sun Junren is a bit sinister, this boss is surprisingly in tune with him in how things are arranged.
From the moment they met until now, many of Sun Junren's arrangements coincided with Xu Yun's ideas, saving him the effort of taking the initiative to speak.
As I said now, go to the pedestal for a walk.
If Sun Junren hadn't said anything, Xu Yun would have made this request.
Then under the leadership of Sun Junren.
The group soon arrived at the busy radar assembly site.
The assembly site covers an area of approximately several hundred square meters and can be divided into two parts according to circumstances:
The first is the groundbreaking area.
That is, the construction site where all kinds of hoes and shovels are clanging non-stop.
There are relatively few people at the construction site, and it is basically the members of the construction sideline team who are busy working.
The task of these sideline team members is to build a suitable base on which to place the assembled radar.
Among the sideline team members working in these jobs.
Xu Yun also met Zheng Tao, Zhou Shaoping and Zhang Gongding, but he did not say hello because they were too far away.
Among them, Zhou Shaoping was wearing a waist protector. It is estimated that Zhou Shaoping's waist injury was caused at this time.
It's a pity that Xu Yun lacks experience in waist injuries, otherwise he could still help Comrade Zhou.
Then very quickly.
Sun Junren took a few people to the second part... which is the area where the radar is actually installed.
There are many boxes stacked in this area, which seem to be mostly radar parts, and there are several technicians busy around each box.
The one closest to Xu Yun's position was a group of people who were assembling antennas.
There are a total of six people in this group, five men and one woman. At this time, they all lowered their heads and hummed and tightened the screws.
Seeing this, Sun Junren walked to one of them and asked familiarly:
"Xiao Ge, how is the antenna assembly going?"
The Xiao Ge whom Sun Jun described was a young man in his twenties, wearing a white shirt, with the cuffs rolled up to his forearms, and his wet hair, which was a little messy and stuck to his forehead.
I heard Sun Junren's greeting.
Xiao Ge turned his head subconsciously and stood at attention immediately after seeing Sun Junren:
"Commander-in-Chief!"
Then he quickly glanced at Xu Yun and others, wiped the sweat from his forehead, and replied:
"Reporting to the commander-in-chief, the rectangular locking block has been installed, and now the polarizing adjustment piece and connecting plate are on."
"Very well, thank you for your hard work."
Sun Junren patted Xiao Ge on the shoulder, then turned to Lao Guo and introduced:
"Lao Guo, let me introduce you."
"This is Comrade Ge Tongyou, we all call him Xiao Ge. He was transferred from Group 581."
"Despite his young age, his professional level is very high."
Lao Guo suddenly raised his eyebrows and said in surprise:
"Oh? A comrade from Group 581? This is a rare visitor."
"It's really hard for you to come all the way to the base to help."
Xiao Ge chuckled when he heard this and scratched his hair shyly:
"No matter how hard it is, I am just a brick. I will go wherever the organization tells me to serve the collective and the people!"
Lao Guo gave him a thumbs up:
"So enlightened!"
While Lao Guo and others were chatting.
Xu Yun on the side stared at Comrade Xiao Ge in front of him in astonishment.
Group 581?
Although Lao Guo and others have tried their best to communicate in black language.
But for Xu Yun, who traveled through time in later generations, this kind of content was no obstacle at all.
The so-called 581 group refers to China's first satellite group.
Group 581 was established in August 1958. 581 means that the development of satellites was the number one task of the Chinese Academy of Sciences in 1958.
In those two years, satellites were the focus of the whole country. Needless to say, 95% of the elderly people named "Satellites" were born during those two years.
However, due to the emergency evacuation of the furry bear experts from the country, the rabbits first focused their resources on the development of nuclear weapons.
In the aviation field, the development of large launch vehicles and artificial satellites has been temporarily suspended, and efforts have been transferred to sounding rockets.
Although in the past few years, the Rabbits have successively launched the T-7M liquid sounding rocket and the first ballistic missile, making great breakthroughs in the aviation field.
But most of the time.
The entire 581 group is still in a relatively Schrödinger state.
But these are not the point.
The focus is on the functions of Group 581 and the particularity of the name [Ge Tongyou], plus the vaguely familiar outline of the other party...
Xu Yun is 95% confident in his guess.
This Comrade "Little Ge" is the same Ge Tongyou he met at the Xichang Satellite Launch Center!
This is like meeting an old acquaintance again...
What's more important is...
According to Ge Tongyou’s original self-introduction.
Comrade Xiao Ge at this time should belong to a smaller fixed team.
Now Ge Tongyou appears here.
Doesn't that mean...
Just when Xu Yun realized something in his heart.
Not far from him, a powerful voice suddenly came:
"Lao Sun! Lao Guo!"
The moment I heard this voice.
Xu Yun's heartbeat skipped a beat without any warning.
Immediately, he turned his head suddenly and looked at the person.
They were only a few meters away.
At this time, a man in his forties with a peaceful face was walking towards them.
This person is clearly...
Mr. Wang!
To be more precise...
Incomparably healthy, young Mr. Wang!
.....
Note:
Maybe I didn't write it clearly yesterday. I wasn't saying it was a black message, I was just praising it. The aircraft carrier was photographed as a fishing boat. This is a joke in the military circle...
It’s the last day for double monthly tickets. After today, monthly tickets will not be doubled. Ten thousand words or nearly ten thousand words have been updated for six consecutive days. Please give me some monthly tickets.
