Chapter 827 Penetrating the Surface of the Earth
Tanzhou, if you say it is the capital city, it is indeed the same.
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.
The 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 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 preliminary state, so it is finished here.
The subsequent feature identification and selection cannot be done by computers because the data has not been verified yet -
Similar to previous applications in the radar field, the algorithm can only extract There are no specific differences in signal characteristics.
As for the specific results 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 measurement and control center hall, stood in front of the screen, and looked up at the remote sensing data spectrum after dimensionality reduction processing with 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 simple 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, these 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. this opinion.
So, he hired the deputy chief engineer responsible for the design of the spaceborne detection system, Ye Jianpei——
Although the detector itself is not entirely domestic, the overall design of the entire satellite Completely done by Huaxia.
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 position:
"It would be best to have the entire remote sensing The log of the data extraction process will be more efficient in this way. "
"We 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 did not answer, just nodded, and then He quickly walked to the server room with his two technicians.
"It seems... you 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 came from.”
This is something Chang Haonan has never been exposed to before, including in his previous life. The question 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 back of the chair.
Li Nianheng and Ye Jianpei are standing not far behind the chairs.
“The results are out?”
“Yes.”
Ye Jian Peiyan 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.”< br>
“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 clearly captures some Information that we had not expected before.”
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 thinking had already spread:
"For example, oil fields and 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 be able to receive a special allowance.
But Meng Zhenyuan’s illusions were quickly shattered.
Chang Haonan held his forehead with one hand and replied helplessly:
"How is it possible... This is almost the 21st century, and the depth of the mine that has not been discovered by humans until now is conservatively estimated. It has to be more than a thousand meters. This is an electromagnetic wave, not a seismic wave. Even the L-band can only go through 20 to 50 at most..."
At this point, Chang Haonan's voice suddenly stopped.
L-band, as a decimeter-wave radar with a relatively long wavelength, may indeed have a certain degree of ground penetration 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 average. Overall, it was difficult to obtain the desired effect.
The very few ground-penetrating radars 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 is the same topographic feature, there are still things we don't know inside, or What’s the difference that couldn’t be observed by remote sensing in the past?”
“You mean...”
This sentence is a bit confusing, but Li Nianheng, an expert in remote sensing technology, quickly understood it. The meaning of Chang Haonan:
"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? "
"Yes."
Chang Haonan affirmed.
At this time, Meng Zhenyuan, who was standing next to him, also interjected:
"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 did not find the mine as he thought just now, 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.
And the practical significance is often discovered in the process of seemingly useless research.
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 even opening his mouth.
The latter immediately called a staff member from behind:
"Xiao Song, please contact the land and resources department immediately and ask them to coordinate the comrades of the China Geological Survey Bureau to cooperate with us. Do on-site exploration at each location”
“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, and 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, at least the Longyuan area should be moved first. It has been done in the Loess Plateau area in the east and the Alxa desert area in western 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 we must give priority to places like this.
"In the east of Longyuan, the China Petroleum Exploration and Development Research Institute can 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."
(End of this chapter)