Chapter 827 Penetrating the Earth's Surface

If you say Tanzhou is the capital city, it is indeed the capital.

But in fact, it is already a hundred kilometers away from Beijing Hang University.

Even more than twenty years later, this place is still a place that has not been completely developed.

With such a distance, it is definitely impossible for Chang Haonan and Meng Zhenyuan to go back at night and come back the next morning.

So the two of them just spent the night in the measurement and control center.

Comrades in the aerospace system do not distinguish between black and white when they are busy, so there is no other thing in this place, but there is no shortage of things like folding beds in empty rooms.

The original plan was to finish the work the next day and then go back to wait for the results of the on-site exploration.

But the time it took to extract the data this time far exceeded Chang Haonan's expectations.

It will not be until the early morning of the third day that the concept decomposition will be completed.

This showed that the "useful" information contained in that picture was far more than he had previously expected.

Fortunately, this algorithm is still in its infancy, so it's done here.

The subsequent feature identification and selection cannot be done by computer because the data has not been verified yet——

Similar to previous applications in the radar field, the algorithm can only extract signal features with specific differences.

As for what is the specific result corresponding to each feature.

That requires someone to calibrate it, at least initially.

After the number of calibrations is sufficient, it is possible to make a judgment based solely on identifying the characteristics of the signal.

Similar to how sonar determines the model of a target submarine through voiceprint information.

Chang Haonan and others returned to the lobby of the Measurement and Control Center, stood in front of the screen, and looked up at the spectrum of remote sensing data after dimensionality reduction processing by the manifold learning algorithm.

There are more than one anomalies found by Li Nianheng on this picture.

So it shouldn't be an occasional bug.

But it's not available everywhere.

So it's not like pure noise interference.

"I think, first of all, we should figure out which sensor captured these strange data."

Chang Haonan first broke the silence:

"It seems that in the past, this data should have been directly blocked as interference, but after using the new feature extraction method, it was exposed."

Li Nianheng nodded, obviously very much in agreement with this opinion.

So, he hired Ye Jianpei, the deputy chief engineer responsible for the design of the spaceborne detection system——

Although the detector itself is not entirely domestic, the overall design of the entire satellite was entirely completed by China.

So everything is still under control.

"I'm afraid raw data alone is not enough."

After listening to Li Nianheng's description of the situation, Ye Jianpei thought for a moment, and then cautiously expressed his stance:

"It would be best to have logs of the entire remote sensing data extraction process, so that the reverse inference would be more efficient."

"We previously performed the extraction operation on server 02, and the operation log should still be saved on it."

Chang Haonan replied:

"Part of the dimensionality reduction process is a black box even for me, but if we just trace the source, it shouldn't have much impact."

Ye Jianpei didn't answer, just nodded, and then quickly walked to the server room with his two technicians.

"It seems... you will have to stay here all night again."

Li Nianheng looked at the back of Ye Jianpei leaving in a hurry and said to Chang Haonan and Meng Zhenyuan next to him.

"It doesn't matter."

Chang Haonan waved his hand:

"I also want to see where those abnormal signals come from."

This was a question that Chang Haonan had never been exposed to before, including in his previous life, and it did make him a little curious.

…

"Mr. Chang, Mr. Chang?"

I don't know how long later, Chang Haonan, who was leaning on his chair and taking a rest with his eyes half closed, suddenly heard someone calling his name next to him.

He quickly opened his eyes and stood up, and draped the blanket that someone had covered him with on the backrest.

Li Nianheng and Ye Jianpei were standing not far behind the chairs.

"The results are out?"

"right."

Ye Jianpeiyan handed a document to Chang Haonan concisely and concisely:

"An L-band polarimetric interference synthetic aperture radar is part of the hyperspectral remote sensing equipment group we imported from France."

"The function of this device when it was designed was to measure target elevation data, and to obtain detailed parameters of surface cover, such as forests, ice and snow, houses, etc. But now, it is clear that it also captured some things that we had not expected before. information arrived.”

Chang Haonan took the file and looked at it, and found that it contained detailed data for this L-band radar.

Even in the manual provided by the French, there is no mention of other functions except the two above.

Apparently, they don't know either.

"Is it possible... that it's resources buried underground?"

At this time, Meng Zhenyuan's thoughts had already spread:

"Such as oil fields, coal mines or..."

When he said this, his eyes lit up.

Obviously, if so many mines can be found in China, it will definitely alleviate the urgent energy shortage in the past two years.

Even if he only played a supporting role, he might still be able to receive a special allowance.

But Meng Zhenyuan's illusions were quickly shattered.

Chang Haonan put one hand on his forehead and replied helplessly:

"How is it possible... This is almost the 21st century. The depth of the mines that have not been discovered by humans until now is conservatively estimated to be more than a thousand meters. This is an electromagnetic wave, not a seismic wave. Even the L-band can only penetrate 20 to 50…”

At this point, Chang Haonan's voice suddenly stopped.

As a decimeter-wave radar with a relatively long wavelength, L-band may indeed have a certain degree of ground penetration capability in theory.

However, in the past, it was generally believed that the penetrating power of electromagnetic waves depended on the composition of the surface covering layer, so it was unstable and the resolution was relatively average. Overall, it was difficult to obtain the desired effects.

The very few ground-penetrating radars that have been put into use are also based on the longer P-band, using the stronger penetration of long waves to conduct some rough searches.

For example, looking for shallow underground caves.

But judging from the picture they just obtained.

The penetrating power of electromagnetic waves is indeed unstable. This is true.

But the effect is not necessarily bad.

It is more likely that because there were not enough technical means in the past, a lot of useful feature data was directly blocked as clutter.

Thinking of this, Chang Haonan turned around and looked at the other three people:

"Is there such a possibility?"

He said and pointed to the big screen:

"Even if it's the same topographic feature, are there still differences within it that we don't know about, or that couldn't be observed using remote sensing methods in the past?"

"you mean……"

This sentence is a bit convoluted, but as an expert in remote sensing technology, Li Nianheng quickly understood what Chang Haonan meant:

"For example, deserts can be divided into rock deserts, gravel deserts, deserts and mud deserts. These four landform features are also different in our past remote sensing data. Do you think these four landform features can be further subdivided? "

"That's right."

Chang Haonan affirmed.

At this time, Meng Zhenyuan next to him also intervened:

"Then we can only ask the comrades from the Exploration Institute to take samples on site and then conduct detailed analysis."

There was obvious excitement in his tone.

Although he didn't find the mine as he just thought, but if Chang Haonan's guess is true, then...

Well, I can't think of any practical significance for a while.

But at least in the field of geology, the names of the four people present today can definitely be left behind.

Moreover, practical significance is often discovered during seemingly useless research processes.

What if.

But Chang Haonan shook his head:

"The areas with abnormal signals on this satellite map are widely distributed, not just in Longyuan. The exploration power of the petroleum system alone may not be enough."

After speaking, he looked at Li Nianheng.

As the person in charge of the remote sensing mission, the other party will inevitably have to deal with relevant units in the geology profession.

In terms of professional research, they are obviously more professional.

Li Nianheng understood what he meant without him opening his mouth at all.

The latter immediately called a staff member from behind:

"Xiao Song, please contact the land and resources department immediately and ask them to coordinate with comrades from the China Geological Survey Bureau to cooperate with us to conduct on-site exploration of these points."

"Do it all...do it all?"

There were dozens of marked points on the map. The person who was called was a young man who looked like he had just started working. He had obviously never seen such a formation.

Li Nianheng pondered for a while. After calming down, he felt that the movement was a bit too loud, so he chose a compromise plan:

"If the personnel and funds are really limited, we should at least do the research in the Loess Plateau area in the east of Longyuan and the Alxa desert area in the west of Mongolia Province. I think the characteristic signals extracted from these two areas are more complex."

Complex means a large amount of information.

It's all a trip anyway, so I must give priority to a place like this.

"In the east of Longyuan, we can ask Huaxia Petroleum's Exploration and Development Research Institute to send personnel to assist them."

Chang Haonan finally added.

"yes!"

After the staff member answered simply, he turned around and trotted out of the hall.

"Professor Meng."

Chang Haonan breathed a long sigh of relief and turned his attention back to the picture displayed on the big screen:

"Our project may not end so soon."