Chapter 826 Measuring China

In this way, a month passed quickly.

During the Spring Festival of this year, Chang Haonan did not go home again.

He basically traveled between Xingcheng and Jinling to solve the problem of radar adaptation.

However, for him, as long as the calibration problem can be solved, one more or one less radar will not affect the workload.

On the contrary, more application data can be obtained for iteration.

Especially for those radars whose main functions are air-to-air, the core program can be the same.

At most, the weight coefficients of several typical features can be adjusted considering the different bands.

Of course, under his insistence, the 14th Institute still installed a small switch for the new target recognition algorithm.

The pilot/operator can choose whether to use it or not.

Although no negative effects have been found in the current tests of this new technology, anyone who has written a program knows that even if there are no problems in the test 10,000 times, there is no guarantee that there will be no problems in the future.

Although the story of a customer entering a bar and ordering fried rice and the bar exploding [Note 1] should not have existed in this era, Chang Haonan has heard of it.

The business trip life of running back and forth continued until the end of February.

Just as the media of the whole country and even most of the world were still paying attention to the series of impacts brought about by China's formal accession to the WTO half a month ago.

February 25, 2000.

With almost no one noticing, the first transmission-type remote sensing satellite that completely belongs to China (Ziyuan-1 is used jointly by my country and Brazil) was sent into space by the Long March 4B carrier rocket at the Jinyang Satellite Launch Center.

After a series of twists and turns such as the loss of satellite signals, on March 10, the first high-spectral remote sensing data of Longyuan and surrounding areas was transmitted back to the Tanzhou Tracking and Control Station located in the northern suburbs of Beijing.

Chang Haonan, Meng Zhenyuan, and several comrades from the National Space Administration have been waiting here for a long time.

"General Manager Luan, General Manager Chang, Professor Meng, this is the first clear imaging picture taken by our Ziyuan-2 01 satellite."

In front of the large screen of the Tracking and Control Center, Li Nianheng, chief engineer of the remote sensing mission, reported to the three people standing next to him.

In addition to Chang Haonan and Meng Zhenyuan, the other person is the director of the National Space Administration, Luan Wenjie.

Of course, since the National Space Administration and the First Division of System Engineering of the Commission of Science, Technology and Industry for National Defense are two different companies with one team, Chang Haonan and Luan Wenjie are old acquaintances.

It's just that they didn't have much contact in the past.

"This should be the image after multi-band fusion, right?"

Chang Haonan asked, looking at a huge black and white grayscale photo on the screen.

Or strictly speaking, it is a few overlapping photos.

From the photo, you can vaguely see the ridges, water systems, cities and roads.

In addition, there are some surface features.

These are the data captured by the hyperspectral sensor.

Because the penetration of the visible light band alone is extremely weak, only the most superficial situation can be seen.

But the advantage is that it is very intuitive.

Mountains are mountains, and water is water.

As the detection band range increases, the amount of information that can be seen also increases.

For example, forests, farmlands, deserts or grasslands under the snow.

These are not directly distinguishable by the visible light band.

But a large amount of multidimensional data mixed together will also make it impossible for the human eye to normally distinguish the content in the data map.

Now that the image on the big screen already contains clearly visible multiple layers of information, it is obvious that it has been processed.

"Yes, this time we refer to the most advanced foreign technology and adopt the technology of processing while transmitting, so that the results can be obtained as soon as the image transmission is completed."

Li Nianheng replied:

"Otherwise, the hyperspectral telemetry data is a unified map and spectrum, and the naked eye can't see anything at all."

In fact, this is the information gap between the two sides.

In principle, Meng Zhenyuan's project is officially started after the satellite enters orbit.

It has not even been half a month.

Therefore, the original intention of the Space Administration today was to let them visit the measurement and control center, familiarize themselves with the basic situation, and then go back to start the project.

Since it is a visit, it must be something intuitive and understandable.

That's why this picture was specially posted.

As a result, Chang Haonan came here today to work directly.

Huaxia Petroleum has even sent out the exploration team in advance, waiting to receive the specific exploration site.

So what he wanted was obviously not to watch the fun:

"Then you should have saved the original data?"

"Of course, they are all saved in the server room. When you need them in the future, I can take you there at any time."

Li Nianheng said and pointed at his feet.

"Huh..."

Hearing this answer, Chang Haonan breathed a sigh of relief.

The thing he was most worried about did not happen.

If the data processing is done on the satellite computer instead of on the ground, then the trouble is a bit big.

Because the extraction algorithm of manifold learning is completely different from the existing multi-band fusion algorithm, it is impossible to reuse the data that has been "contaminated" by the latter.

He calmed down and said to Li Nianheng:

"Then let's go now. Our algorithm framework has been built and we need to use the original data for extraction."

"Okay..."

Li Nianheng had already received instructions from Luan Wenjie. As long as it did not violate the principles and did not involve satellite orbit and attitude control, the entire measurement and control team was working around Chang Haonan.

So he nodded almost subconsciously, and then prepared to take Chang Haonan to the server room.

However, before he could finish saying the word "ok", his turning around stopped.

After a few seconds, he slowly looked back.

At this time, Luan Wenjie next to him had also set his sights on Chang Haonan and Meng Zhenyuan.

"Have you... figured out your algorithm?"

Li Nianheng's brain was running rapidly, but after thinking about it, this sentence seemed to have only a literal meaning...

but……

It’s only been 15 days since Resource No. 2 was called.

If you exclude the day when the signal was not found at the beginning.

Only 14 days.

Even our Measurement and Control Center has just received the first complete surveying and mapping results of northwest China.

Then you two came here for the first time and didn’t even know which way the door of the measurement and control center opened.

Have you figured out the algorithm for extracting and analyzing remote sensing data?

Seeing the confused and confused eyes of the two people in front of him, Meng Zhenyuan took a step back calmly.

"Professor Chang did it, not us, it has nothing to do with me..."

Of course, he only said this in his heart and could not really say it out loud.

"Ahem..."

Chang Haonan cleared his throat:

"In principle, we can't say it's been done yet."

"It's just that the framework has been set up. Next, we need to compare it with the on-site exploration data, check the results, and then make some adjustments based on the actual situation."

But Luan Wenjie and Li Nianheng both had expressions on their faces like "I've read so many books, you can't fool me"——

You can't compare these two things together at all, right?

If building an algorithm framework is like building a house, then adjusting parameters and checking can only be regarded as decoration.

Although it is also a necessary process before moving in, the importance and time required are obviously not at the same level as the former.

Now that the land equivalent to mine has been approved for you, the building has already been erected.

Simply outrageous.

However, despite being shocked, the two of them still had their sanity.

After calming down a little, he took Chang Haonan and Meng Zhenyuan to the computer room where the original data was stored.

In order to ensure information security, using a laptop to physically connect to a server is definitely not allowed.

Just make a copy of the data, and then you can do whatever you want.

Fortunately, there is no shortage of supercomputer at the Measurement and Control Center, so Chang Haonan does not even need to return to Beijing Airlines, but directly takes action on site.

…

Compared with the radar echo data processed in previous tests, the amount of information contained in each hyperspectral data map is more than one order of magnitude, so it is impossible to obtain real-time processing in real time like on an early warning aircraft.

In fact, it took five hours just to complete the first step of local embedded feature extraction.

But the effect was immediate.

"These places... seem to be different from the results obtained from data fusion..."

Li Nianheng came closer with his laptop and compared the pictures on the screen in front of Chang Haonan.

Compared with the picture I saw in the hall before, there is already a lot more information.

"It's weird..."

Li Nianheng pushed up the glasses on the bridge of his nose:

"Look here."

He said, pointing to a position slightly above the picture.

North of Longyuan, a land parcel in Mongolia Province.

"This place should be an entire Alxa Desert, but the result after processing...not to mention comparing with other deserts, even within this area, the signal characteristics are all messy, and it feels like there is noise that has not been eliminated. Look."

This is not a place where the West-East Gas Pipeline will pass, but the satellite images were taken together.

Chang Haonan followed Li Nianheng's instructions and took a look.

This is really the case.

"Don't worry, we will have to do regularized matrix decomposition and concept decomposition later."

After looking at it for a while, he decided to give up temporarily:

"At present, this picture is only a semi-finished product. It is only exported for comparison with the finished product later."

"After all the data extraction is completed tomorrow, we should be able to see it more clearly."