Judging from the data on the screen alone, it is just a very ordinary lidar signal, if it weren't for the wrong time scale, Wang Yinan felt that he was conducting a lidar finalization test.

"It's still not right", Wang Yinan thought, if it is to test the transmission signal data of the lidar, this is very normal, but the problem is that this is the data received by the lidar, which is really nerve-wracking.

After a long time after the failure of the summit of Mount Everest, with the release of the special feature of Weixing Newspaper, the wind direction of public opinion began to change slowly, Wang Yinan could finally take a breath, and after he gave two lectures at Imperial Capital University, he began to ponder the mysterious radio black hole some time ago.

After yesterday's lecture at Imperial Capital University, he called Chief Yang and asked about the black hole, and Chief Yang was also happy, not to mention that there are many people who know about this matter, and it is not particularly confidential information, and there is a high-speed special line between the company's headquarters and 116 Institute, and that night Chief Yang sent a last received lidar signal data.

How can this kind of thing be missing the genius beautiful girl mathematician Li Wenjing, as well as her assistant Zhao Keqin, when Wang Yinan told her what happened on the phone, Li Wenjing almost didn't jump up, "Why did you tell me this kind of thing now!" ”，

"You know, it's likely to be a signal from another civilization."

"Deciphering the information of aliens, it's exciting to think about it", if it weren't for the phone, Wang Yinan estimated that Li Wenjing's fist would have been beckoned over a long time ago.

Using the Gödel system, Wang Yinan and Li Wenjing compared the received signal with the signal emitted by the lidar in great detail, and the result was both unexpected and very magical.

If you don't consider the timeline, the signal sent out and the signal received are exactly the same in terms of shape and even intensity, considering the attenuation of seawater, the analysis result given by Chief Yang is that the hexagonal radio black hole, no, to be precise, is a laser black hole, and the received signal is accurately emitted back according to the same shape and intensity.

But the problem is that the timeline is completely wrong, as if the time of tens of hours is compressed into a few minutes.

To say that this is a natural phenomenon is probably not believed even by the most absurd and fantasy authors.

But if it weren't for nature, how did this hexagonal black hole do this, and what is the point of doing so?

Since the discovery of such a supernatural phenomenon, the search and rescue operation in the South Pacific has come to an end, and of course, the Xianglong has still performed very well in the search and rescue process that has been completed, and has also been praised by the Navy.

Whether it is an aircraft carrier formation or an ocean-going formation with the theme of ordinary frigates, the Xianglong UAV should be used as a standard, and at least 3-5 aircraft can be equipped to ensure the normal communication of the formation, but the navy can't help but complain about the endurance of the UAV.

"It would be great if we could achieve non-stop sailing," said the officer of the General Staff in charge of equipment procurement, whose face was full of regret, "In that case, the fleet would be able to maintain a second communication link with the country except for satellites wherever it goes, which would be very good for combat missions."

Because of the endurance problem, the navy conservatively purchased 20 Xianglong UAVs, "if the endurance problem can be solved, there is no problem to increase the purchase volume by ten times or twenty times," said a military official with deep pockets.

For the current Wang Yinan, this point of entry is completely ignored, and his entire attention is on this pile of damn signals.

"Let's touch it, diverge our thinking, maybe we can hit a spark", looking at Li Wenjing and Zhao Keqin, who were also sitting at the computer desk, Wang Yinan's proposal received enthusiastic support.

"That's it, I need some strong coffee to give me inspiration", Li Wenjing jumped, "Go, Go",

So a few people sat on the edge of the sofa and began to talk about it, Wang Yinan made a big cup of Sprite, Li Wenjing made a cup of coffee, and Zhao Keqin looked at the two bosses, and finally decided to make himself a cup of tea.

"Let's talk about my thoughts first", Wang Yinan mentioned the beginning, "First of all, it can be concluded that this signal must be unnatural",

"Correct nonsense", Li Wenjing nodded, "You didn't say anything",

"Then tell me about your analysis results, what progress has been made", Wang Yinan asked,

"There is no natural or even unnatural product that can change the flow rate of time, so the received signal cannot be the transmitted signal," Li said.

"No", Wang Yinan said, "this statement of yours is inaccurate",

"At least the general theory of relativity predicts that the huge gravitational pull has the potential to change the flow rate of time, in other words, a miniature black hole, or wormhole, has the potential to change the flow rate of time, so what we may receive is that the signal emitted by ourselves is transmitted back through the wormhole."

"That's too mysterious, what's more, send back the signal we sent, it's not a boring intelligent life, there must always be a clear purpose for doing this, what is their purpose?" , Li Wenjing asked,

"It's good that I want to know, this is just a conjecture, what about Keqin, have you found anything", Wang Yinan turned around and asked Zhao Keqin,

"Not yet, but I found that the data received is not exactly the same as the data transmitted," Zhao Keqin said, pointing to the screen of the notebook in front of him.

"Here, here, and here are all different",

"Let me see", Wang Yinan immediately became interested, he sat in front of the computer, and began to carefully check the place pointed out by Zhao Keqin.

"Could it be an error, or the background noise of the ocean, you know, in the sea environment, the background noise is very obvious," Li Wenjing asked.

"It's not quite the same, if it's an error, it should conform to the Poisson distribution, let's find out these differences first", Wang Yinan sat in front of the computer like a chicken blood, "Let the Gödel system do a shape comparison, and accurately compare the transmitted signal with the received signal",

"But it is still necessary to remove the influence of noise and error, that is, to compare where there is a significant difference".

"The size of the difference should not only be measured by variance, but also the length of time and the characteristics of the shape itself," Li Wenjing adds.

"The derivative at the bottom of the valley is not the same as the derivative at the peak, so it has to be normalized."

"No problem, Gödel's system is too good at this, I don't have to think about algorithm optimization first," Wang Yinan said.

"Supercomputing to deal with this is anti-aircraft artillery to fight mosquitoes, and it does not need to be optimized at all."

Thirty minutes later, Wang Yinan wrote the program for salient difference detection, entered it into the Gödel system and began to execute.

Although the algorithm is very simple, but where is the amount of data after all, the original launch data is nearly thirty hours, and the data that needs to be compared is a few minutes, and after half an hour of calculation, the results are out.

There are so many differences that even if you just select the significant differences, the waveform map over the entire time domain is dotted with different color symbols representing the significant differences.

"It seems that there is a certain pattern of differences", Wang Yinan said, "but I am not sure".

"Because the middle part may be error or noise, and the other part may be ignored," Li Wenjing adds.

"It's too difficult to analyze the differences that we've gotten so far."

"Well, that's true", after carefully looking at the output of the Gödel system, Wang Yinan nodded, "From the perspective of the sample, the noise is too loud, and you still need to find a way to restore valuable information",

"Can you train the neural network of the Gödel system so that it can recover the original signal from the noise as much as possible?" , Li Wenjing proposed,

"It's a good idea, but according to Shannon's information theory, neural networks can only work if the proportion of noise is below a certain threshold, otherwise, no matter how good artificial intelligence is, there is no way."

"The best solution is to find a way on the original data", Wang Yinan began to read words in his mouth again,

"Where can we find better raw data, or what is the biggest flaw in the current raw data?" ，

"By the way, Wen Jing, if this is really the work of aliens, do you say that their technology is more advanced than ours, or is it backward than us", Wang Yinan seemed to have discovered something, he asked Li Wenjing,

"Nonsense, of course, it is more developed than us, and it is even possible to have one more dimension than us, otherwise how could it disappear silently", Li Wenjing joked,

Automatically ignoring Li Wenjing's wild fantasies about high-dimensional life, Wang Yinan then said his thoughts, "In that case, they should far surpass us in any field of science and technology, such as timers."

"Timer, what the hell is this?" , Li Wenjing didn't understand,

"I see", Wang Yinan shouted like Archimedes, "if it is really a more high-tech civilization, their time accuracy should far exceed ours, our current sampling rate is 40,000 times per second, that is to say, 40 samples per millisecond",

"This indicator is already very good for ourselves, but other civilizations may put information in microsecond waveforms",

"Are you saying that the raw data we got has actually lost too many details, and it is very likely that valuable information is hidden in these details", Li Wenjing also understood a little,

"This speculation is very reasonable", the more Wang Yinan thought about it, the more he felt that his inference was correct.

"You see, the data we receive is to compress dozens of hours of signals into a few minutes, and from this detail, we can reasonably infer that the time concept of this unknown civilization, or the time scale, is likely to be far more than ours," Wang Yinan said.

Li Wenjing and Zhao Keqin both nodded, which was a very reasonable and natural inference.

"Therefore, it is only by further subdividing the time scale that it is possible to discover the hidden truth." Wang Yinan said,

"But what we have obtained is already the best data, the sampling frequency of the lidar signal receiver is only 40,000 times per second, and what is hidden at the microsecond level, even if it is hidden at the level of ten microseconds, the existing equipment will not be able to detect it," Li Wenjing said.

Wang Yinan nodded, "Yes, the details are the real devil",

"Even if we develop a signal receiving device with 400,000 or even 4 million samples per second, it will not work."

"When the laser black hole appears again, I don't know if it's the year of the monkey",

"I'm really unwilling." 8)