Black Technology Refresher Manual

Talking to the system, he walked a long way without realizing it. Sheng Mingan felt pain in the soles of his feet, so he stopped and looked up at the road signs. He was surprised to find that he had passed four bus stops, and an hour and a half had passed by the time.

He turned his head to look at Chen Jingqiu, and was stunned for a moment, but he was alone, because Chen Jingqiu looked even more embarrassed now than when he was embarrassed in the Children's Palace.

Although it was late, the summer heat had not receded. After walking on the street for nearly two hours, he must have been sweating profusely, especially since Chen Jingqiu was still carrying a heavy load of more than ten kilograms.

Chen Jingqiu's hair and white T-shirt were all wet with sweat, and there were many small tears in the hand holding the nylon bag. It didn't bleed, but it must be stinging if it was soaked in sweat.

His lips were dry and rough, his stomach was rumbling, and he was obviously thirsty, hungry and tired, but his expression was still silent, without any embarrassment, as if he was used to any difficulties and pains.

Seeing Sheng Mingan stop, Chen Jingqiu also stopped, looked up and asked, "Are you there?"

"I'm not leaving." Sheng Ming'an stopped a taxi by the side of the road and asked Chen Jingqiu to move the nylon bag into the back seat of the car, then took out a 100 yuan note and handed it to him: "Thank you."

Chen Jingqiu took the banknotes, and when Sheng Mingan told the driver his address tens of kilometers away, he knew it.

Obviously he could ask a taxi driver to carry books in the Children's Palace, but he refused to do it. He would rather spend money to hire him, but it was not a good intention to help, but deliberately took a detour for more than an hour to torture him.

It's like watching for so long in the Children's Palace just now, and didn't stand up until someone was ready to help him solve his troubles.

Depending on the situation, his relationship with another group of people is not good.

Is it because you want to make the other party unhappy that you reluctantly stand up and speak?

The evening wind blew Chen Jingxie's hair on his forehead and his collar. He stood by the roadside, ignoring his tingling stomach and skinned soles, and calmly speculated about Sheng Mingan's motives, but none of them were out of kindness. .

"Goodbye." Sheng Mingan said.

Chen Jingqiu showed a standard smile: "Goodbye." It doesn't matter if it's malicious, he needs money.

Sheng Ming'an in the taxi wondered if there was anything wrong with his actions, although he helped Chen Jingqiu, but with Li Jiaozhuyu in front, it didn't count as stealing his light.Hiring Chen Jingqiu was not a temporary idea, but to consider whether it would be more convenient to match Chen Jingqiu and Li Jiao if this relationship continued, and deepen the bond between the two.

After much deliberation, Sheng Ming'an concluded: Very good, no problem!

The system originally thought that the host, knowing Chen Jingqiu's value in advance, would deliberately approach or curry favor like a game player, whether it was out of true love or pursuit of profit, it was all to satisfy his own greed.

That kind of person would never be able to hide from Chen Jingqiu, a monster who seemed to be able to read people's hearts.

But after watching the whole process of the host intentionally torturing the Great Devil Chen, the system quickly changed its mind.

It sighed: [Now I believe that the host really wants to complete the task. 】

Sheng Ming'an:'? 'He was.

***

After returning to Sheng's house to accompany his grandfather to have dinner, Sheng Ming'an went to his room to continue reading until his biological clock reminded him that it was time to go to bed, then he took a shower and climbed into bed to sleep.

Getting up early the next day, Sheng Mingan went to the second floor of the basement to prepare for dance practice.

The second floor of the Sheng family's basement is the dance practice room of Sheng Ming'an's mother. Since the death of Sheng's mother, the door of the dance practice room has been closed and has not been opened for a long time.Mama Sheng is a Latin dancer, proficient in various dances, and of course Latin is the best. She has won the Latin Dance Championship of the World Dance Sports Federation (WDSF).

Before Sheng Mingan was found out to be an AS patient, Mother Sheng made detailed plans to train her baby son to be the best Latin dancer in the world.

It's a pity that AS patients are born with poor athletic ability, very clumsy limbs, and no talent for dancing at all.

Mother Sheng couldn't bear her son's suffering, so she gave up her dream of letting him inherit her mantle, and instead supported his interest in extremely deep fields such as numbers, atoms, and cells.

In his previous life, Sheng Ming'an was forced to face a strange world after he came out of the nursing home, a lonely world without parents, grandfather, and friends, and because he was bound by restraint belts all year round, he could hardly walk. In order to regain control of his body's coordination and Balance, he has to move!

Even if the calf muscles are atrophied, even if the spine is not straight, even if the fingers are difficult to grasp, he must exercise!Keep moving!In addition to scientific research, the remaining energy and time will be devoted to sports!

He chose Latin.

As a memory and inheritance of his mother, it seems that when he dances, his relatives return to him.

In the previous life, Sheng Ming'an's mentors and classmates were all from the academic circle, and he knew many medical students who made various medical beauty products, so they brought a lot of qualified medical beauty products to force Sheng Ming'an to heal his face, so he was cured. Red sores on the face that have been treated for several years.

Although there were still light red marks left in the end, Sheng Ming'an, who had fully bloomed, was so delicate and bright that even the blemish red marks became embellishments.

When he dances the passionate samba, or the soft and lingering rumba, or the fierce and fierce bullfight, the corners of his eyes are flushed, but the light-colored lines on his cheeks are like a rose tattoo in full bloom. It is even more magnificent and dreamy, unlike what should be in the world.

Sheng Ming'an didn't know that he had the reputation of "Rose on Earth" in his previous life, because no one came to praise him in front of him, and because he was used to others' negation of his appearance.

The national standard Latin is a sports competitive dance, but unlike other sports, ballet and other dances that have high age requirements, no matter how old you are, you can practice and achieve results.

Sheng Mingan, who practiced persistently for more than ten years in his previous life, has dancing skills that are not inferior to professional Latin dancers.

Sheng Mingan started to do warm-up exercises, from single-leg support exercises to instep pressing exercises, then stretched the thighs by pulling the thumbs of both feet to tighten the leg lines, and there were seven or eight other warm-up exercises.

Not to mention how sour and refreshing it feels when the bones collide with each other and the muscles of the whole body are stretched to the extreme.

After finishing the warm-up exercise, Sheng Mingan started to play lingering music, and he was about to dance the rumba.

Latin is divided into five dances: rumba, samba, cha-cha, cowboy and bullfighting. Among them, rumba is called the soul of Latin.

The fully stretched limbs are a combination of softness and strength, lingering, charming, lyrical and romantic. Even if there is only one person, you can also indulge in the rumba solo dance, one fast one fast one slow, the waist and hips swing continuously, it seems to be provocative but not kitsch Erotica.

It's a pity that no one can see Sheng Ming'an who is slowly blooming at this moment. It's a pity that his red sores on his face are not healed, and he can't participate in it in the best condition. In fact, he is better at quite intense bullfighting with large movements, big jumps and rotations Kind of dance.

Sheng Ming'an practiced in the basement for three hours, and regained a little bit of the feeling of the peak state of his body in his previous life. After the hearty exercise, he went back to his room and continued to read the pile of professional books.

After reading one book after another, and mastering the basics of radar, I started to study the principles of SAR and InSAR, from airborne to spaceborne, mainly using spaceborne SAR for ground detection and military applications. By the way, I read some books related to phased array radar. .

The above part is the most difficult to understand, as for modeling and simulation, it is not difficult.

Because modeling and simulation are often used in other disciplines, and Sheng Mingan has done hundreds of modeling and simulations in his previous life, which makes perfect for him.

After a thorough understanding of its principles, it is time to consider how to apply it in practice.

The days passed day by day, time passed quickly, Sheng Mingan lived a repetitive life every day, either in the basement or in the room reading, spent most of the time in the room, and went out once during the period.

Go to the doctor to confirm that the red sores on the face are skin allergies, and the allergen is the wool fabric at home.Those woolen fabrics happened to be sent by my aunt, and I sent them over several times, and she was very considerate.

Knowing that the wool fabric was sent by Li Zhengping's wife Lin Li, Grandpa Sheng was silent for a long time, patted Sheng Mingan on the shoulder and told him to take his medicine on time, and did not question Li Zhengping's family, because he was not sure if Lin Li knew about Sheng Mingan. Allergic to wool.

If it was a coincidence, it would be useless to blame Mao rashly.

It's just that Grandpa Sheng became wary of Li Zhengping, and because of Sheng Ming'an's hard work in recent days, he also considered whether he should continue to run the mobile phone company.

This was beyond Sheng Mingan's expectation, and it was considered a windfall.

As for Li Jiao, I also approached Sheng Ming'an during the period, and sent him the list of books that I listed that I might need for the next episode of the show.

Sheng Mingan took a quick glance and found that books such as "Mathematical Modeling", "R Language Combat", "30 Cases of Matlab Intelligent Algorithms" are all preparations for modeling, which shows that Li Jiao speculates that the next topic of the program is likely to be related to modeling relevant.

Speaking of which, he completely forgot about the program "Youth Strong".

Even those cruel words that were released were forgotten.

Sheng Mingan bowed his head and pondered for a while, put aside this unimportant matter without any psychological pressure, and opened the MATLAB software to start the radar system design.

Radar is an electronic device that uses electromagnetic waves to detect targets. It emits electromagnetic waves to irradiate targets and recovers echoes to obtain information such as distance, azimuth, and radial velocity of targets.

There are many categories, among which synthetic aperture radar (SAR) is a radar that uses Doppler frequency shift to achieve high-resolution radar imaging. It is usually used for ground search. Back to the central calculation and data processing of the radar, high-resolution imaging is obtained after calculation and processing, which is presented in front of the computer light screen, and the target image can be clearly observed, and more intuitive information data can be accurately obtained.

[Simulation and modeling of radar system based on MATLAB Simulink. 】

This is the subject of Sheng Mingan's first attempt at radar system simulation modeling after thoroughly understanding 23 radar introductory and in-depth professional books.

He opened the Word document and the MATLAB application software, the add-on Simulink, at the same time.

MATLAB, also known as Matrix Laboratory, is a commercial mathematical software that integrates many powerful functions such as numerical analysis, matrix calculation, scientific data visualization, modeling and simulation of nonlinear dynamic systems, etc. in a window environment.

The add-on Simulink is a visual simulation tool in the MATLAB application software.

The premise of radar system simulation is to establish an integrated environment for system modeling, simulation and design. Its main modules are radar system simulation modeling platform software and simulation model library.

If it is compared to building a house that is easy to understand, land and various materials are needed to build a house, the radar system simulation modeling platform software is the foundation, and the radar system simulation model library is the material library.

There are various basic materials in the material library, that is, modules in simulink. You can develop modules required by the radar system such as target, clutter, and pulse compression by writing S functions. The development of system modules needs to be based on ground requirements. That is, the model library is subject to the specification of MATLAB.

"First, establish the radar system design simulation class library structure."

In the room, two desktop computers with 12G memory exude fluorescent white light, the chassis makes a rumbling sound, the desktop is full of software, and the running software is crowded with the taskbar.

The running software occupying the entire large screen is Simulink, and the structural blocks appear on the screen one after another in an orderly manner, such as the foundation laid in an infrastructure project, and the cornerstones are these built-on modules.Then classification processing, each module enters the sub-library, builds multiple sub-libraries, and the sub-libraries are combined into a complete simulation class library structure!

"OK! Next is a synthetic aperture radar simulation system..." Sheng Ming'an's fingers flew like flying, and the keyboard was tapped. The prototype of the simulation system was first seen. Clear and clear.

"Modeling the received data...adding the target signal to the chirp signal. The target echo information includes..."

Although it has been simplified, the still complex and huge structural system pops up on the screen, and the black and white striped waveform diagram jumps out and ends. All the data is recorded by the software and also memorized by Sheng Mingan in his mind.

Programs invisible to the naked eye are running at high speed, and thousands of lines of code flash and jump along with the rumble of the chassis, jointly building a majestic and majestic miniature electronic information world.

"The allowable range of relative error is on the order of 10^4, set the parameters and start the simulation!"

When he finally started the simulation to check the final result, Sheng Mingan didn't move.

During the simulation modeling process, he does not pause at all. People need to stop and think when doing any mental work, and sometimes they need paper and pen to help sort out the context. There is no room for any mistakes in the calculated figures. Usually, it takes at least two or three days for a modeling to be completed with the cooperation of multiple people.

This is still a premise that the ability is not bad, and the process is likely to have errors that need to be overturned and restructured.

But for Sheng Mingan's first simulation modeling, there was only one person, and the process did not stop, as if he didn't need to think. All the simulation modeling process was engraved in his brain, and his brain was like a supercomputer with a large capacity!

If you let radar engineering professionals watch it from beginning to end, you will definitely sigh that this is a good seed!

If they know that Sheng Ming'an is not a radar engineering major and can master this level after only half a month of self-study, then they will be amazed by the genius!

Sheng Mingan breathed a sigh of relief and pressed the Enter key.

"Run!"

The light screen jumps silently, and all the program codes run under this command, just like thousands of troops ready to go to attack the enemy under the order of the general. The invisible code jumps almost at the speed of light, and finally passes through the computer. The process of tens of millions of components rushing to the screen to display the results is actually only a few tens of seconds.

The black-and-white waveform graph is still after jumping, and the actual target parameters are compared with the signal parameters detected by the constant false alarm rate (CFAR). The results are consistent and meet the simulation expectations.

"The first radar system simulation modeling, completed!"

It worked!It took three hours, and there were no major errors, and the result was perfect!

[Ding dong. 】

System: [Congratulations to the host for completing the introductory study of radar engineering! 】

Sheng Ming'an: "It's just an entry-level level, which is far from enough to unlock the level. I need practical experience, I need to apply my thorough knowledge proficiently to actual modeling, and I also need professional guidance."

He closed his eyes and muttered to himself: "You can't learn anything behind closed doors."

Fingers tapped the mouse pad rhythmically, and the clock on the desktop clicked softly, but it was extremely loud in the extraordinarily quiet room.

"Yes!" Sheng Mingan suddenly opened his eyes, the beautiful and cold peach blossom eyes seemed to be filled with stars.

Because of the emotional excitement, a little blush appeared on the cheeks covered with white ointment, but it was a pity that it could not be seen.But the corners of the eyes are also faint with peach blossoms, looking at the eyes, I feel the water is shining, and the beauty is just blooming, but I don't know it.

Sheng Mingan straightened up, opened Baidu, entered a URL, entered a dark blue full-English webpage with a bar on the screen, quickly registered and logged in, and jumped to the radar problem challenge area of ​​the radar engineering section.

"LabRoots that provides a 3D virtual platform for scientific 'communication'!"

LabRoots, one of the world's top five academic exchange forums.

The people who come and go to this forum are scholars from academic circles from all over the world, and if you are lucky, you may even meet big names in various fields for advice.

Publishing papers, journals, research literature, etc. on it can share resources, and can also provide comments, dialogues, and even provide virtual and visual communication. All in all, it is a very open communication platform.

System: [Host, do you want to catch big bullies on this academic platform?Warm reminder, the probability of your level being able to catch a boss is less than 1%, and the probability of keeping a boss is less than 0.1%. 】

It can be said to be quite a biting taunt, and it is almost blunt to say 'you are too weak, the boss is too lazy to hold you'.

Sheng Ming'an: "I have self-knowledge, and I never think that it is a good phenomenon to sit on the sidelines."

System: [Then what do you want to do? 】

Sheng Mingan smiled: "Post a post. Download the challenge letter."