Most of the colleagues in the laboratory who attended the dinner were young people, and although Wang Yinan was already a well-known professor at Imperial Capital University, strictly speaking, he was only a college student who had only graduated a few years ago.

Several turtles in the laboratory who have been overseas for many years are a few years older than him, so everyone still has a common language when they chat, and when they are drunk, Zhou Hui, who rushed over when they heard the news, immediately acted as Wang Yinan's protector.

On the territory of competitors, Zhou Hui's vigilance is still very high, "drunk and disorderly", it's not just talking, Zhou Hui doesn't want others to do it again.

So she protected Wang Yinan behind her like an old hen guarding food, and the wine came to the cup, killing all sides.

Under the protection of Zhou Hui, Wang Yinan was finally able to get out of the way, but Zhou Hui drank a lot but acted like a nobody, and shouted that he wanted to drive back by himself.

"The female star and the professor of Imperial Capital University were arrested for drunk driving, and they also shouted that my father was Li Gang."

The imperial capital in the middle of the night, there is a kind of cold and lonely beauty, today is the day of the full moon, "next month is the Mid-Autumn Festival", looking at the cold moon hanging outside the tall building on the street outside the car window, Wang Yinan said with some emotion,

"Yes, time flies so fast", Zhou Hui leaned on Wang Yinan's arms, although she couldn't see the cold moon, she still let out her own emotion,

"Time is a wonderful thing, but whether you are rich or poor, beautiful or ugly, time always treats you equally",

"That's not necessarily, for every different person, time is a very subjective thing", Zhou Hui, who had drunk a lot of wine, instinctively began to raise the bar,

"Time is fair to everyone", Wang Yinan disagreed,

"No one can change the speed at which time passes",

"But for everyone, the feeling of time is different, didn't Einstein say that time is relativistic, and time with beautiful women will pass very quickly".

Wait, Wang Yinan seems to have found something amazing, "What are you talking about", Wang Yinan said to Zhou Hui,

"Say what you just said, say it again",

"I said that for everyone, time feels different", Zhou Hui said in a daze,

"Every different person has a different feeling of time", Wang Yinan said something in his mouth, "Damn, I must have ignored something very important",

"What is it", Wang Yinan fell into hard thought.

"Your destination has arrived", the words of the substitute driver interrupted Wang Yinan's thoughts, and Zhou Hui had already fallen asleep in Wang Yinan's arms.

Wang Yinan was about to pay with the app, and the driver said embarrassedly, "Professor Wang, if you don't pay, how about giving a signature?"

Touching his face, Wang Yinan was a little surprised, "Am I so famous?" ”，

"That's okay, it's okay to sign, but the money still has to be paid", Wang Yinan finished speaking, or clicked on the payment of the app, and the substitute driver took out a paper and pen from the toolkit and handed it to Wang Yinan with a sincere face.

Wang Yinan asked while signing his autograph, "I'm not a big star, why are you looking for me to sign an autograph, if you want to find it, you have to find the one inside", he pointed to Zhou Hui, who was sleeping in the back seat.

"Our kid is going to take the university entrance exam next year", the substitute driver looked calm,

"Find Professor Wang and ask for an autograph to put in his room, just like the ancient champion Wenbao, it also has a bit of literary atmosphere."

This reason is very good and powerful, Wang Yinan smiled bitterly and hugged Zhou Hui out of the car, "I'm home, I'm home", waking Zhou Hui up while saying goodbye to the driver.

When he got home, Wang Yinan put Zhou Hui on the sofa in the living room, took a blanket to cover it, and Wang Yinan sat on the side and began to think hard.

"Something to do with time",

"What am I overlooking that should be something very important?"

"And it is related to the individual feeling of time",

Looking at Zhou Hui's serene and delicate face lying on the sofa, Wang Yinan suddenly felt very lucky, it is said that some people with makeup and without makeup are just like two people, fortunately...

Holding his mobile phone, Wang Yinan opened the stopwatch app and put the mobile phone on the coffee table next to the sofa.

took out his mobile phone from Zhou Hui's pocket, lit up the screen casually, and looked at the clock on the lock screen, Wang Yinan began to continue in a daze.

It seems that the time of the two mobile phones is exactly the same, and it stands to reason that if you choose to automatically synchronize the time, the time of the mobile phone is calibrated according to the timing signal of the mobile network base station.

However, the timing accuracy of the mobile network used by ordinary mobile phones is about the order of milliseconds, which is far from the expected microsecond order.

"So, what mechanism does the signal receiving device used by lidar achieve time synchronization?"

"In the endless ocean, it is obviously impossible to rely on ordinary mobile networks to achieve calibration, so the only possibility is through the GPS signal of the satellite".

"But the accuracy of the satellite's GPS signal is also limited", Wang Yinan muttered,

"What the hell am I overlooking?".

At this time, Zhou Hui turned over on the sofa, "so thirsty", she seemed to want to get up and find water to drink, Wang Yinan hurriedly held her down,

"Don't move, I'll pour it for you", Wang Yinan turned around and took out a bottle of mineral water from the corner of the living room and unscrewed it.

After drinking the water, Zhou Hui fell down and fell asleep again, it seems that she did drink a lot today,

Time passed little by little, but Wang Yinan didn't feel a trace of sleep, as if there was a gift box full of treasures waiting for him to open in front of him, but he couldn't untie the packing belt.

"When, dang, dang", three small but crisp bells woke Wang Yinan from his contemplation, he looked at the wall clock on the wall, it was already three o'clock in the morning, and the two mobile phones on the coffee table also jumped to 3:00.

"Three timing devices, it looks like the time is the same", like a lightning bolt across Wang Yinan's mind,

"But actually, there must be subtle differences!" ，

"Any device that has a relationship with time should be the same",

"No matter how accurate the electronic device is, the time reference used for positioning has a limit in accuracy, although it looks the same",

"But in reality, there are definitely nuances."

Wang Yinan stood up suddenly, walked to the floor-to-ceiling window in the living room, opened the floor-to-ceiling window, and walked to the balcony, letting the outdoor wind blow through his brain, which was heated by overuse.

"The fleet conducting searches in the South Pacific, with so many drones and ships, must have more than one lidar, and it is impossible to have only one signal receiving device",

"Although all signal receiving devices are time-calibrated by satellite GPS signals",

"But within the permissible margin of error, there must be slight differences, and under normal circumstances, faster or slower, these differences should be located on both sides of the exact time according to the Poisson distribution",

"Theoretically, then, there will be subtle differences in the timeline between the signals received by each electronic device",

"As long as there are enough samples of the signal with differences, we can theoretically reconstruct a signal that is more accurate than the accuracy limit of the device!" ，

"Perhaps, the truth is already in our hands, but it just needs a pair of discerning eyes to find out."

Wang Yinan waved his fist, "I'm so stupid, why didn't I think of this earlier",

"Moreover, the original data has a retention period, I have the impression that the retention period for civilian and military is not the same, civilian should be two weeks, how long is military?" ，

"I really hope that the retention period of the military is forever, no, no, no, 10,000 years is enough."

Wang Yinan couldn't wait to call Chief Teacher Yang of the 116 Institute now, but looking at the time, he still dispelled his thoughts, no one will destroy the materials at this time, as long as he contacts the relevant units before going to work tomorrow, it will be too late.

Of course, Wang Yinan couldn't sleep, he looked at Zhou Hui who was sleeping on the sofa, it seemed that this eldest sister would not be able to wake up for a while, just go to morning exercise, change into equipment, Wang Yinan went downstairs and started running.

Circle after circle, circle after circle, seeing that the sky was slowly brightening, Wang Yinan finally waited until the time came to seven o'clock in the morning, and he couldn't wait to dial the phone of 116 Chief Yang Division,

The phone was connected quickly, and it seemed that Chief Yang was also an early bird, "Calling me so early, is there any major discovery?" Chief Yang still knows Wang Yinan very well.

"Do you remember what I told you, that valuable information is likely to be time-relevant, and it's hidden in the data we receive," Wang said.

"Yes, we discussed it later, and everyone agrees with your point of view and thinks it is very likely, but the accuracy of our equipment is not enough, and the details that exceed the accuracy of the existing equipment have been lost while recording the signal",

"There is no way to make up for this kind of thing, only to wait for the signal to appear again, and we are now already working on signal receiving equipment that improves the accuracy by ten times", said Mr. Yang.

"In fact, these details are not completely lost," Wang said.

"How is it possible, is there really a time machine, let's talk about it", Chief Master Yang suddenly became excited,

"Let's say the accuracy of a machine is 40 samples per millisecond," Wang said.

"Yes, at present, our equipment is basically this accuracy", Chief Engineer Yang agreed.

"In other words, samples are taken every 25 microseconds, and the accuracy of our timing signals is about this magnitude," said Wang Yinan.

"For example, if we have a device that performs a sample at time t as required, due to the limitation of timing accuracy, it is possible to actually sample at 12.5 microseconds before t or 12.5 microseconds behind t," Wang Yinan explained.

"It's very reasonable, continue", Mr. Yang seems to understand Wang Yinan's meaning a little,

"For a device, it is meaningless to be ahead or lag a little bit behind", Wang Yinan's voice became louder,

"What if it's dozens or more of them?" , Wang Yinan is about to shout out,

"According to the principle of random distribution, in fact, the exact sampling time of these devices will be evenly distributed on both sides of the theoretical time point according to the Poisson distribution",

"In other words, as long as the number of signal samples is sufficient, it is possible for us to reconstruct a signal with an order of magnitude higher theoretical accuracy than a single device through dozens of samples!" , Chief Master Yang immediately understood what Wang Yinan meant,

"Wang Yinan, you are a monster", Chief Master Yang has not forgotten to praise Wang Yinan, of course, his praise method is a bit unique,

"I won't tell you, I will immediately notify all the units and departments present to save and summarize all their recorded data, according to the principle of confidentiality, these data should be kept for at least three months, there should be no problem",

"I'm afraid that the data of some civilian companies does not follow this principle, and it will be troublesome",

Chief Master Yang also immediately realized the crux of the problem, and he immediately hung up the phone.

Next, all Wang Yinan can do is wait.

Letting go of his worries, Wang Yinan continued to run around the community.