Black Technology Refresher Manual

"What, what is the phase unwrapping algorithm?"

Someone asked in a daze.

"This has to start with phase unwrapping. The so-called phase unwrapping is to unwrap the phase after de-leveling and filtering, so as to obtain the real phase. InSAR is the process of interferometric radar from monitoring targets to imaging. Data processing, which is what we often call InSAR data processing.”

"Data processing is an important part of interferometric SAR imaging, and this part also includes key technologies such as filter processing, phase unwrapping, and atmospheric correction values. Among them, phase unwrapping is the most difficult and the easiest to fail, but its data accuracy But it directly affects the accuracy of DEM and DInSAR technology in measuring surface deformation variables!"

"For more than 30 years, various algorithms have been proposed to solve, improve, and improve phase unwrapping. The purpose is to obtain more accurate phase data, so as to obtain clearer and more intuitive imaging and deformation data!"

"In practical applications, phase unwrapping is embedded as an embedded module in the software that processes interferometric radar data, so that when the radar software is running, it will automatically use this module to process the measured data."

"Speaking of the phase unwrapping algorithm, there are two main types of algorithms: path tracking algorithm and least squares algorithm."

"The least squares algorithm is the optimal algorithm, but the accuracy is not so good..."

balabalabala.

The person who asked the question was dizzy and couldn't understand at all. He only knew that the so-called phase unwrapping algorithm was very complicated and important.

"All in all," the person said unsatisfactorily, "if Sheng Ming'an calculates a phase unwrapping algorithm that is more accurate and more suitable for practical application, it means that our country's existing interferometric radar technology is likely to be more advanced than foreign countries in this respect. !"

This is too great, right? !

The person next to him then asked: "Is there a big difference between my country's existing radar technology and the international level?"

"At least in the area of ​​SAR earth observation and imaging, there is a big difference. The domestic radar satellite interferometry technology cannot reach millimeter deformation detection. There is no complete set of technology and software system for interferometric SAR millimeter deformation measurement with independent intellectual property rights. The annual cost Huge bought from other countries..." In the middle of speaking, the Tianjin University student suddenly swept away the cloud on his face, geared up, and said very excitedly: "So you know why we reacted so strongly!"

"Understood, understood."

The students majoring in radar engineering of Tianjin University were so passionate about science popularization in the auditorium that even those who didn’t know the new phase entanglement algorithm at the beginning said, “It’s very important!”Very awesome! 'Basic concept.

But isn't it too fake that such a powerful new algorithm was created by Sheng Mingan, a 'mentally handicapped' and 'high school student'? !

"Who is that old man? Can he be trusted? Is it true?"

No one can give an answer.

They stared at Sheng Ming'an and the two old men in the museum in tacit understanding, and they all quieted down, held their breaths and eavesdropped on the conversation between them——

"How do you calculate?"

"Based on the least squares adjustment, the noise elimination algorithm is performed on the interferometric SAR, and the quantitative comprehensive objective function is established under the premise of taking into account the noise filtering and fringe information... to make the theoretical and technical system of optimal filtering..."

Sheng Mingan explained slowly, taking advantage of the pauses to catch his breath, even in such a mentally exhausted situation, he still explained the new algorithm clearly and completely.

"So that's it." Shen Weiguo pondered: "Did you also improve the algorithm of the atmospheric correction value?"

Student from Tianjin University: What?

Sheng Mingan nodded.

Student from Tianjin University:! ! !

Shen Weiguo stared at Sheng Ming'an: "How does it compare with the internationally accepted atmospheric water vapor spatial interpolation technology?"

Sheng Mingan thought for a while and replied, "The accuracy is 70%."

Shen Weiguo asked: "New phase unwrapping algorithm?"

Sheng Mingan: "40%."

Shen Weiguo: "Can I have a look at the numerical model and algorithm process?"

Sheng Mingan stepped aside, "The complete ideas are all on the D disk and the draft book, you can read them as you like."

When he stepped back, he accidentally bumped into Chen Jingqiu's shoulder. Sheng Mingan grabbed his arm and panted, "I'll give you 50 yuan, let me lean on you."

Chen Jingqiu, who intended to support Sheng Mingan, heard this, and looked down at him. Because of the exhaustion of 24 hours and 5 hours of concentrating on simulation and modeling, Sheng Mingan was so tired that he was panting lightly.

He closed his eyes, as if he could fall asleep at any time.

The mask covered the lower half of the face, but the unusually beautiful eyebrows and eyes showed a cool temperament. If it weren't for the red sores and swelling on both sides of the cheeks, he might be more beautiful than Li Jiao.

But not as understanding as Li Jiao, not as witty and likable.

What does Sheng Mingan think of him?How bad is the impression that you can't wait to draw a line after working together for three days, like being afraid of being stuck with garbage.

Chen Jingqiu thought indifferently, and suddenly backed away, causing Sheng Mingan to almost stumble and fall, but fortunately Zhao Da stepped forward to support him with quick eyesight and hands.

Sheng Mingan opened his eyes reluctantly, and saw that it was Zhao Da, so he continued to lean on with confidence: "Thank you, friend."

The tone is familiar, there is no need to draw a clear line for Qian, it really only targets him.

Wang Ruo stood on tiptoe to look at the computer and drafts, and inadvertently caught a glimpse of Chen Jingqiu's side face. Her angle was just right to see Chen Jingqiu's eyelids drooping. It was as dark as the dark night, cold and mechanical.

Actually, it was a bit scary, reminding her of a certain world classic crime movie she had seen, in which the serial murderer stared at the dead female corpse with these inorganic eyes.

Yes, terrible.

Wang Ruo quietly stayed away from Chen Jingqiu.

Even if the lanky boy stands in the lively crowd, he will still be isolated, rejected and feared.

***

Back to 1 minute ago, when Xu Ruodong completed the simulation modeling, the crowd suddenly cheered, and the fanatic fans closest to Li Jiao's group on the left shouted: "Ah, ah, little sun won!!", "Li Jiao, baby, come on, come on!" !", "Li Jiao's team will win!"

They didn't notice Sheng Ming'an's team at the bottom right of the large electronic screen, so that the audience cheered, especially the audience on the far right burst into cheers. Li Jiao's team thought it was all cheers for them.

"Li Jiao, we won!"

"Li Jiao, you are too powerful!"

"Brother, they are all celebrating for us!"

"It is thanks to Senior Xu that we can win, and Senior Xu is our magic weapon." Li Jiao said with a smile.

Xu Ruodong didn't smile, but was a little puzzled.

Xiaoyang asked: "Xu Shen, are you unhappy?"

"I'm just surprised by their reaction." Xu Ruodong shook his head: "You see, there are also graduate students and seniors preparing for graduate studies in the auditorium. Everyone is of the same level, and they will go on a carnival for my not so good simulation modeling?"

Xiaoyang was stunned for a moment, then patted Xu Ruodong on the shoulder and said, "It just shows that you are amazing! Who else would you be if it wasn't you? Do you think there is any other team on the field who has completed the simulation modeling besides us?"

While talking, Wu Shunde and Professor Yang, who were in charge of judging them, came out side by side and came to Li Jiao's team to test their results.

A group of people were nervous, and even Xu Ruodong couldn't help clenching his teeth, staring at Professor Wu Shunde with piercing eyes.

After inspecting around, Professor Wu Shunde came to Xu Ruodong: "There were some minor problems in the process, but it was done well. If you want to study for a Ph.D. in the future, you can consider my laboratory."

Xu Ruodong was ecstatic when he heard the words: "Thank you, Professor Wu!"

Professor Yang then commented on Li Jiao's group, mainly encouraging him. He also praised Li Jiao's basic knowledge of programming and was quite talented. He asked him whether he should consider the Information Department of Tianjin University for the college entrance examination.

Li Jiao looked up at the camera that had been following their group all the time, and just smiled modestly at Professor Yang when Director Pan came over and said, "Professor Wu, please go to the fourth group to see the situation."

The staff had called Wu Shunde just now, but he refused.

Professor Wu frowned: "I said that it is not impossible to complete the simulation modeling within 5 hours! If you are a professional, you are very familiar with radar engineering, and you are a genius, it is not impossible for him to do it. Besides, simulation modeling also has to process the data first and then Unified programming modeling, maybe they are such a division of labor, how can it be cheating?"

"Because they changed the topic that the program group arranged at the beginning, and it became a more difficult simulation modeling of interference SAR deformation monitoring technology." Director Pan hurriedly explained: "It is also because the person who completed the modeling alone was named Sheng Ming'an, a light Mentally handicapped high school students."

"Sheng Ming'an?!"

"It's him acting as a demon again!"

"How is it possible to complete the simulation modeling of interference SAR deformation detection technology within 5 hours?!"

The above are the blurted words of Li Jiao, Wan Xu and Xu Ruodong respectively.

Professor Wu: "You put a mildly mentally handicapped high school student on science and education programs?"

Dao Pan faltered and didn't know how to explain it, but Wu Shunde knew there was something tricky at a glance. He didn't bother to pursue the filthy things in other industries, but he couldn't tarnish the radar project and engage in scientific research cheating in front of him!

"Go and see."

Professor Wu Shunde walked forward with a sullen face.

Dao Pan raised his eyebrows with joy, and hurriedly led the way.Li Zhao and Wan Xu clenched their fists, pushing and pulling Li Jiao to watch the show together, and Xu Ruodong followed.The other two groups just finished the simulation modeling, and they all rushed over when they saw that there was something lively to watch.

The professors at Tianjin University glanced at each other, and there was nothing wrong with them, so let's go and watch the excitement.

And the auditorium on the left whispered, obviously heard their conversation, and expressed their deeper disgust for the cheating Sheng Mingan.

"Cheating in the program group, it's a precedent for Shenghou to force him."

"There are more than a dozen live scenes, [-] audience members, and professional professors...why can't you think about cheating?"

"We will never understand the brain circuits of the mentally retarded."

Hu Ruzhu taunted her, but at the same time, she was glad that she quit the resurrection team early, otherwise she would be implicated by Sheng Mingan now!

Before Wu Shunde could open his mouth here, Zhang Ping next to Director Pan couldn't wait to open his mouth: "Is your resurrection team cheating in partnership? Hurry up and tell me who is remotely controlling your computer?"

When Zhao Da and the others heard this, they immediately became angry: "Who said we cheated?"

Zhang Ping squeezed into the crowd: "It's not cheating, you can complete the simulation modeling in 5 hours? Just rely on him Sheng Ming'an?! A high school student, independently completed a graduate level radar project, can you say it's not cheating?"

First he questioned aggressively, and then he moderated his tone and persuaded: "I know you all want to advance and show yourself well in front of the public, but a fake is a fake, how can it become real! Well, I know cheating The person is Sheng Ming'an, don't help him hide it, let him speak out."

Wan Xu chimed in: "We are friends of Sheng Mingan, and we know that there is something wrong with his nature. Now, in front of the director and professor, you can just speak up, and you don't have to worry about Sheng Mingan bullying you."

Li Zhao: "We know how much Sheng Mingan is, but you still want to defend him? Why bother, it's just a program promotion competition."

"Zhao Zhao." Li Jiao frowned, looked at Zhao Da and the others, "I'm sorry, Ming An has caused trouble for everyone."

The expressions of Zhao Da and the others suddenly became weird. After working together for three days, they were convinced that Sheng Mingan was a genius!

Why did Li Jiao and others who kept claiming to be 'friends' and 'relatives' concluded that Sheng Mingan cheated and had a bad personality?Why are there rumors that 'Sheng Ming'an is mentally handicapped'?

"Sheng Ming'an can't cheat, he...he's very smart."

Zhang Ping was a little impatient: "Is it cheating? Let Professor Wu take a look and you will know? Get out of the way, what are you doing?"

Zhao Da: "Professor Wu?"

Zhang Ping was arrogant: "Professor Wu Shunde, director of Xidian Engineering Institute, professor of radar engineering!"

Zhao Da's face changed. Professor Wu Shunde was originally a candidate for a mentor that he didn't even dare to think about. He was also the most qualified professor among the judges and one of the leaders in the radar industry.

If the previous old man was not good enough and misread Sheng Mingan's digital model, if Sheng Mingan's new phase unwrapping algorithm is actually flawed...then their current behavior will all become a joke!

Of course the biggest joke will be Sheng Ming'an!

Zhao Da couldn't help worrying about the Great God.

The three of Wang Ruo didn't know Wu Shunde, but they knew that he had a great background from the famous name, and they were all worried that Sheng Ming'an would be deliberately made things difficult for him.

Zhang Ping sneered, pushed Zhao Da away, and glanced at Sheng Ming'an who was still dozing off, thinking to keep going crazy, keep pretending, and cry when you are exposed as a Xibei bastard!

"Professor Wu, please—who are you? Get out of the way!"

Zhang Ping scolded Shen Weiguo and Zhang Qunfang who were standing in front of the computer. Shen Weiguo, who was immersed in several new algorithms but was suddenly interrupted, turned his head back with a dark face: "Wu Shunde, it is too arbitrary to conclude that cheating is not clear. Already!"

Wu Shunde, who was invited in, suddenly lost his voice in astonishment: "Old Shen?! Why are you here!!"

Shen, old Shen?

Who is this?

Some of the postgraduate students of Tianjin University who had already left the auditorium and squeezed in to watch closely were suddenly stunned: "No, it's not...it's not the old Shen I thought."

"you recognize?"

"Who is Mr. Shen? Better than Professor Wu?"

The man was trembling with excitement, and shouted loudly: "Old Shen! Shen Weiguo! The super super super bull in the radar field! The person who ascended to testify!!"