The Red Era, the Opening University Speech

Chapter 237 New Doppler Radar!
He opened his mouth and couldn't help asking, "Advisor Li, do you have any research in aerospace?"

"I've only dabbled in it a little." Li Mu said with a smile.

This is not out of modesty, but there is no need to talk so much with Professor Xie Ding.

Knowing too much will not do any good to the other person.

Although the latter wanted to ask more, he had to give up when he saw that Li Mu kept silent.

……

The four of them continued chatting for a while, and more experts and professors came to the office one after another. After greeting Li Mu, they began to work on the compilation.

Li Mu stayed for a while, chatted with Huang Kun and Wu Xi, then left the Ministry of Culture and Education and came to the Semiconductor Research Institute.

I looked at the time, it was exactly 12 o'clock, so I quickly finished my lunch and then went to the radar subsystem R&D laboratory.

Due to shortage of manpower, the original radar data acquisition subsystem, radar product generation subsystem and main user terminal subsystem were finally integrated into one R&D group.

Although this result is regrettable, it is also an unavoidable one.

Even though basic researchers can be supplemented through various means, mid- and upper-level researchers cannot be supplemented directly and require time to cultivate slowly.

……

Li Mu had just reached the door and hadn't gone in when a student came out.

Seeing him, she uttered a low exclamation: "Advisor Li."

Hearing this voice, everyone in the laboratory turned around immediately.

In addition to expert professors such as Peng Shilu and Wang Shoujue, most of the young researchers in the radar subsystem R&D group have come from training courses.

"Lei Ming, you were assigned here, that's good." Li Mu smiled and greeted the boy who exclaimed. The other party was the outgoing boy he met when he first went to the training class.

Even if most students pass the training courses, they still have to study for a considerable period of time before they can be competent for research work.

The fact that the other party was assigned here in advance shows that his talent is quite good.

Being praised by Li Mu, Lei Ming showed an embarrassed smile and said, "It's all thanks to Consultant Li's good teaching, otherwise I wouldn't have this opportunity."

"Keep going, I'm rooting for you." Li Mu patted him on the shoulder gently, then looked at the five training class students who had just been assigned to the laboratory and said, "You too, work hard and strive to achieve results as soon as possible."

The students' eyes suddenly showed excitement, and they said excitedly, "Yes, Consultant Li, don't worry, we will not let you down!"

Although he was about the same age as Li Mu, everyone acted as if they were facing an extremely respected teacher, which made Peng Shilu, who was standing next to him, look a little strange.

His evaluation of Li Mu rose several levels.

Strong research ability is rare, but the ability to teach and educate is even rarer. If one has both, it will be a great blessing for the country.

……

After Li Mu had a brief chat with Lei Ming and others, they found Wang Shoujue and Peng Shilu and asked about the research progress on the radar subsystem.

They said:
"We are currently starting to develop the radar data acquisition subsystem according to your proposal."

"Things are going relatively smoothly at the moment, but there is one problem that is not a problem."

"The radar data acquisition system's current cache speed is a bit insufficient, and the circulation rate is also relatively poor..."

……

Wang Shoujue and Peng Shilu talked to each other and slowly explained the problems they were currently facing.

Cache speed and circulation rate are indeed important issues, which are directly related to the real-time performance of the data acquisition system.

To put it simply, it is the reaction speed of the radar after detecting the target.

As for why they said it was not a problem, it was because the Doppler radar developed by the Radar Research Institute had already surpassed that of Emperor M and Big Brother by a large margin.

Given that all the data show crushing results, the impact of this issue is minimal.

Li Mu also understood this.

But he won't ignore the problem.

Just leading in radar is far from enough. What is needed is leading in all aspects and angles, so that Emperor M can also experience what despair is.

It's just like the D-bomb developed by the Xia Kingdom in later generations, which had a speed of up to Mach 42. Everyone knew you took off, but they couldn't defend against it at all.

Although the current level of development of D-bombs is not that exaggerated, we still need to be on guard.

It would be best if the radar on their side could immediately issue an early warning as soon as the D-bomb plane or something like that is launched or takes off. That would be very reassuring.

Thinking of this, he looked at everyone who was looking at him and said:
"Scientific research cannot be sloppy. Implementing high-speed caching and increasing the data flow rate are issues that must be addressed."

"I have actually considered some solutions to this problem."

"Let's have a meeting and discuss it together to see if it's possible."

As he spoke, he led everyone to sit down in the small conference room next door.

Wang Shoujue and Peng Shilu looked at each other and smiled, with emotion in their eyes.

They were used to Li Mu's practice of always being ahead of everyone else.

……

There were more than a dozen people crammed into the small conference room, making it a bit crowded.

However, no one complained. No matter whether they were students who had just entered the institute or experts and professors who had been collaborating with Li Mu for a long time, they all held a notebook in front of them, looking like elementary school students listening to their teacher's lecture.

Seeing this, Li Mu felt a little helpless.

Although he tried his best to avoid giving a direct solution, he had to take action now because it was related to the development of the new Doppler radar.

He cleared his throat and said:

"To solve the problem of cache and data circulation rate, we can use asynchronous FIFO and phase-locked loop structure."

"The concept of FIFO was mentioned in Gray coding, but it is not perfect. Simply put, it is a first-in-first-out data buffer or queue that can synchronize data in different clock domains in digital chips."

"And asynchronous FIFO is mainly used to solve the data synchronization problem between different clock domains in FIFO, that is, the control signal of one clock domain is used to write data, and the other is used to read poetry, thereby realizing the cross-clock domain transmission of data."

……

Li Mu first explained to everyone the structural principles and concepts of asynchronous FIFO and phase-locked loop.

The latter was invented earlier, in 1930. It is an electronic circuit that uses an external reference signal to control the frequency and phase of the oscillation signal inside the loop, and automatically tracks the output signal frequency to the input signal frequency.

Of course, the early appearance does not mean that the technology is perfect.

It was not until the mid-60s that phase-locked loops were truly widely recognized by the market.

However, he had detailed information, so it was not difficult to complete it. After he finished speaking, the sound of pens hitting paper in the small conference room continued for a while before stopping.

Peng Shilu also came back to his senses from the solution Li Mu had explained, and sighed:

"Asynchronous FIFO and phase-locked loop structure, it's amazing that you can come up with this solution!"

"What do you mean it's not perfect? ​​At this level, even if it's improved, it will be like a textbook."

"Let me ask you one more thing. Have you also studied the radar product production subsystem in advance? Why don't you just tell me now?"

At the end, there was a hint of sarcasm in his words.

"I really don't have that. Besides, I don't have much experience in the research of key components such as radiation units, antenna apertures, transmitters, receiving arrays and signal processors. How can I have this ability?" Li Mu shook his head.

Although he did have complete information in his hands, it was obviously impossible for him to take it out directly.

Moreover, he does not intend to interfere with most of the radar product subsystems.

He had already checked this aspect of research in advance, and knew it could be completed entirely with the help of a computer simulation platform, so there was no need for him to get involved too much.

Hearing this, Peng Shilu looked a little regretful and said, "That's right. Well, I overthink it. You have only studied applied physics for a short time. I'm afraid you haven't explored this aspect deeply enough."

"This way, if you want to study in the future, you can go to the outside institute and directly check our previous research materials."

"Is it okay?" Li Mu's eyes lit up when he heard this.

Although he had previously assisted in the semiconductorization of Doppler radar electronic components at the Radar Research Institute, he had never had the opportunity to view those top-secret materials.

If you can go and take a look, you can understand the current level of key radar components such as transmitters, receivers, signal processors, etc., and perhaps you can perform certain optimization and upgrades based on later information.

Seeing Li Mu's delighted face, Peng Shilu said, "Of course you can, but you can only look at it in the station and you can't take it away."

"Okay, then I would like to thank Director Peng first." Li Mu said happily.

……

Afterwards, everyone came up with the method of asynchronous FIFO and phase-locked loop structure, and immediately began experiments to continue their research work.

Li Mu thought about it and decided to stay to assist in the research and development.

……

A week passed in a flash.

While the semiconductor group's technical team was still being formed, Li Mu devoted most of his time and energy to the research and development of three radar subsystems.

With his help, the radar subsystem R&D team made rapid progress.

The problems with the data collection subsystem were quickly resolved, and the product production subsystem was almost complete, except for the final main user terminal subsystem.

Computational heat dissipation is a heat dissipation difficulty caused by the increase in the number and density of transistors. Li Mu used a new in-package active cooling technology to solve it.

Broadband multifunctionality requires maximizing the use of existing apertures and bandwidths to achieve multi-sensor applications and promote the development of broadband multifunctional RF processing technology.

This problem was solved by Li Mu by improving the performance of FPGA (field programmable gate array) and using custom silicon chips.

Then there are issues of sensor fusion, cognitive perception, throughput, and real-time performance…

……

Li Mu worked sleeplessly for a week, sleeping only four hours a day, and finally developed the new Doppler radar before the technical team of the semiconductor group officially started.

Inside the radar subsystem R&D group laboratory.

The huge equipment filled the entire room, and Peng Shilu, Jiang Nanying, Wang Shoujue and others were carrying out the final adjustments.

As the first contributor, Li Mu was ordered by Wu Youxiang to rest on a chair nearby.

He said helplessly: "Director, don't worry, there is nothing serious wrong with my body."

"Then you have to take a rest. Letting you watch here is already my biggest concession. Tell me, how can you work continuously for half a month? Now that it's the final stage, there's no need for you to deal with it anymore." Wu Youxiang said mercilessly.

As he spoke, he looked at the tired expression on Li Mu's face, which was full of regret and self-blame.

Just when he received the news that the new Doppler radar was successfully developed and rushed over, he saw Li Mu staggering and almost falling to the ground. His heart stopped for a moment.

Li Mu looked at Wu Youxiang who was guarding him closely and smiled helplessly. He had to give up the idea of ​​completing the final test and sat on the chair to watch.

In fact, he was indeed a little tired, but not physically, but mentally.

His physical condition was no longer as fragile as it was at the beginning, but the high-intensity mental consumption for a month, coupled with his tense nerves, caused him to suddenly feel dizzy when he completely relaxed at the moment of success.

Of course, these explanations sounded like pure sophistry to Wu Wangxiang and were completely useless.

……

As a researcher ran in from outside the door and told everyone that the test target had been launched, the final test of the Doppler radar officially began!
Li Mu's eyes were fixed on Peng Shilu, who was in charge of hosting the event.

As the radar subsystem operates, lines of data quickly appear on the screen of the main user terminal, including the distance, speed, direction and altitude of the detected target.

Of course, this is just the most basic data. There are also data such as distance change rate, azimuth and pitch angle, radial velocity, etc.

It didn't take long for the test to be completed.

The radar's reaction speed and various data performances far exceed the most advanced Doppler radar in the world today!

Peng Shilu turned around, and before he opened his mouth, the raised corner of his mouth had already revealed the final result.

He strode up to Li Mu and said in a hoarse voice, "Thank you, Consultant Li. Without your help, there would be no success today."

"I just did what I could." Li Mu smiled slightly and finally breathed a sigh of relief.

After solving the Doppler radar problem, the next step is to solve the problem of magnetohydrodynamic thrusters, and then he can devote himself to building the technical team of the semiconductor group.

Just as he was thinking this, warm applause suddenly broke out in the laboratory.

Everyone's eyes were fixed on the seated Li Mu, their gazes filled with respect and admiration.

Especially those students in the training class who were trained by him, there was a hint of fanaticism in their eyes.

Li Mu raised his hand, and after everyone quieted down, he said, "Okay, everyone must be tired after so many days of high-intensity research."

"Go back and have a good rest first. When you wake up, Director Wu will hold a celebration party for us."

Hearing this, everyone couldn't help but cheer again.

"You still remember to talk about others. You also need to have a good rest." Wu Youxiang looked at Li Mu beside him and said helplessly.

Thanks to my old friend "You are the sand that cannot be held" for giving me 300 points
Thanks to the book friend "——M——" for rewarding 100 points
Also thanks to all the book friends who voted
Seeking monthly ticket

Seeking monthly ticket

Please give me a monthly ticket!

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(End of this chapter)