"You know the recent situation in the South China Sea," Mr. Deng said.

If Zhang Qi was present, he would definitely jump up, do you remember the mysterious call he received at the earliest, "Ouyang, South China Sea, Moon", these three key words are becoming reality step by step in a wonderful way in Wang Yinan.

"I heard that some small countries around it are very noisy, but I think they must not be so bold, and the background must be a rice country", Wang Yinan said,

"Of course, without the support of the rice country, I would not dare to provoke trouble if I lent them ten dares", Qian Lao said.

"A few days ago, the double aircraft carrier formation of the rice country came to the South China Sea for a turn, and as a result, these clowns climaxed collectively like a doping, what kind of Indosia did it, and even sent a few of their broken ships out to learn what freedom of navigation the rice country does."

"Bah, just these stinky monkeys, too?" ，

"In response to this situation, our South China Sea Fleet has carried out actual combat exercises of dispersion and missile launching," Deng Lao said.

The orderly opened a 42-inch LCD TV under the tree,Take out a U disk and plug it in,Soon,The TV appeared divided into two parts,The quality of the picture on the left is poor,It is accompanied by obvious shaking,At first glance, it is the fleet command room,There seem to be a lot of big people in the picture on the right,Wang Yinan was blinded by the general star on their shoulders,This should be a command center。

In the video, the officers and men of the fleet command room judged the current situation based on the radar and information and reported to their superiors, while in the command center, they made a judgment based on the received fleet situation and sent instructions to the fleet.

Looking at the continuous emergence of more than a dozen air-to-air, sea-to-sea, and possibly cruise missiles of various types from the vertical hair system of the hot and cold frame, accompanied by air waves and flames, although it is not a real situation, it has been a while since then, Wang Yinan's heart is still surging.

The video is not long, it is only five minutes in total, and it will be played quickly, and when Wang Yinan finishes watching it, Qian Lao asked,

"See what the problem is not",

"You also think too highly of me, there is no beginning and no end, let me find any problems", in this kind of big thing, Wang Yinan didn't dare to drive the train with his mouth full, "I have to give some hints, what kind of problem?" Wang Yinan asked,

"Of course, it has something to do with the purpose of calling you over, Qian Lao said that your thinking is divergent, maybe there is a good idea", Deng Lao said,

"Then I'll have the audacity to guess, I look at the video, the most awkward part should be a matter of time", Wang Yinan said,

"Or rather, a problem of synchronization",

"This video should be the live video of the fleet command room, spliced together with the live video of a command center, the standard of splicing, I looked at the time in the upper right corner of the left and right screens, it is strictly synchronized in accordance with the time of the imperial capital",

"I noticed that in the picture of the command center on the right, there is a big screen, which is also the live broadcast of the fleet command room, and it is obvious that the live broadcast of the command center is about 0.5 seconds slower than the live broadcast at the same time on the left", Wang Yinan pointed to the LCD TV and said,

"Similarly, when receiving an order from the command center in the fleet command room, there is also a delay of about 0.5 seconds, so that there may be a delay of about one second from the discovery of the situation to the execution of the order, which looks particularly conspicuous in the rapidly changing situation of modern warfare."

Qian Lao turned his head and said to Deng Lao, "What's the matter, I'll just say that this kid must be able to see it."

Although Deng Lao called "Xiaohui" and "Xiaohui" very affectionately just now, he still didn't have a good face for Wang Yinan, "I can see what's the use, there has to be a way to solve it."

Qian Lao said to the orderlys, "Call Colonel Li of the Science and Technology Industry Commission to come over", and after a while, a young, capable soldier walked in, "Report to the chief, Li XX was ordered to come to report",

Mr. Qian said, "You can introduce Professor Wang's current situation and problems in our communication system, Professor Wang has the highest authority, and all the details do not have to be kept secret from him."

Colonel Li saluted Qian Lao, "yes", and turned to Wang Yinan.

"Our current command center and fleet communication lines mainly include triple backup, the first is the largest capacity, but also the part of the video transmission you see, mainly through the existing commercial communication satellites in synchronous orbit, all commercial communication satellites manufactured by our country, when necessary, transponders will be given priority to military channels",

"The second backup is that in addition to commercial communication satellites, there are special military communication satellites, the details of these military communication satellites are highly confidential, and the satellites will also change orbits from time to time, in addition, if necessary, the use of rapid launch system, we can launch 4 satellites within 8 hours, set up a temporary communication network",

Wang Yinan opened his mouth wide, he really had a lot of money, and he didn't expect that my country was so good, and a temporary satellite communication network could be set up in 8 hours, so I asked who else, it is estimated that even the rice country can't do it.

"The third backup is the use of the Nandou system, we all know that the Nandou system is China's global positioning system, but when necessary, it can also be used to do temporary satellite communication, of course, due to channel limitations, transmission of video or something can not be done, but some emergency communication is still no problem."

"The video transmission uses the encrypted H264 protocol, and the cryptosystem is a public key system based on elliptic functions developed by ourselves."

"What is the transport protocol, TCP or UDP?" , Wang Yinan asked,

"H264 runs on top of TCP," replied Colonel Lee.

"Understood", Wang Yinan nodded,

"The situation in the South China Sea is indeed very special, and there is no way to use various shore-based fiber optic facilities or submarine fiber optic cables."

"By the way, I heard that all the submarine fiber optic cables we lay, every other distance, there will be an access point, nuclear submarines do not need to surface the sea, as long as they find a submarine fiber optic cable access point closest to themselves, they can communicate with the headquarters through the submarine fiber optic cable, is this true or false", Wang Yinan asked curiously,

Colonel Li didn't answer for a long time, but his face was blue and white for a while, he turned his eyes on Deng Lao for help, Wang Yinan looked as if he had asked a question that shouldn't be asked, is it true, he hurriedly raised his hands, "Oh, hey, I didn't say anything just now, I didn't ask anything, let's continue to look at the problems of the existing system."

"In other words, all communications are satellite-based at the moment, right?" Wang Yinan asked.

"Yes, it is also the progress of science and technology in recent years, otherwise it would still be a big problem to communicate with the fleet", replied Senior Colonel Li.

"The altitude of the synchronous satellite from the ground is about 36,000 kilometers, and the satellite of the Nandou system is slightly lower, about 20,000 kilometers, and the two points of communication are not strictly directly below the satellite, so the actual distance is farther," Wang Yinan said.

"The speed of light is 300,000 kilometers per second, so even if there is no delay, the minimum delay of one-way transmission of a signal completed by a synchronous orbit satellite is about 300 milliseconds, because the orbit of the Nandou satellite is low and the distance is close, so the delay through the Nandou satellite will be slightly lower, about 200 milliseconds", Wang Yinan gave his own estimate.

"This does not take into account the data loss and error correction of the channel itself, the TCP protocol is a typical confirmation/retransmission protocol, only suitable for low-latency networks, and it is extremely inappropriate for satellite networks with high latency and high packet loss rate.

"I estimate that this protocol will at least double the delay for you, so it's no wonder, just now I saw the video footage of the command center, and the delay was obviously more than half a second."

Colonel Li was speechless for a long time, Wang Yinan didn't notice his face, and said to himself,

"This problem is simple, if the channel resources are sufficient, it is a big deal to waste 20% of the bandwidth by using the UDP protocol of FEC, and this part of the delay can be reduced to almost nothing, that is to say, the video delay can be reduced to the physical limit, about 300 milliseconds."

Deng Lao next to him was not calm at all, "It can be reduced to 300 milliseconds, that's already very good, Xiao Li, you go back immediately and organize people to study, and if you have any questions, ask Professor Wang directly",

"Yes", Colonel Li agreed very simply.

Qian Lao grabbed Wang Yinan, "300 milliseconds is also a long time, can it continue to decrease?" ”

"Hey, don't tell me that you haven't studied the command system of the rice country, they should also use a satellite-based global communication system", Wang Yinan don't speak,

"If they can do it for less than 300 milliseconds, I'll lose your head."

Qian Lao smiled embarrassedly, "We have indeed studied the navy of the rice country, and they should also be about 300 milliseconds",

"However, just because the rice country can't do it doesn't mean we can't do it", Qian Lao began to pour ecstasy soup into Wang Yinan,

"I have always felt that you are a person who can create miracles, if you go out, you will definitely be able to get the first place in the world, and when the time comes, I will give you special credit",

"Speaking of asking for merit, the last time the 116 Institute was a collective first-class merit, and Chief Yang also took an academician of the Academy of Sciences by the way, but I didn't have anything here", Wang Yinan didn't agree,

"Why don't we talk about this matter after we explain what happened last time?" ，

"I remember that you took half of the funds for the flight control system of Mr. Yang, nearly 100 million soft sister coins", Qian Lao is not a vegetarian,

"It's natural to work and get money, what is there to say", Wang Yinan said,

"This money has reduced all taxes for you, or you have paid all the taxes that should be paid, and I will give you a first-class credit in the future," Qian Lao said.

Sure enough, Jiang was still old and spicy, and Wang Yinan wilted all of a sudden, "Don't, don't, do you think I'm a person who cares about fame and fortune so much", what's more, even if fame is over, profit is still very important.

In fact, tonight, as soon as Wang Yinan heard what the two old men were looking for him, he had been secretly having fun in his heart, in the battle to challenge Goliath, Wang Yinan's plan, there was a very important link, this link was very important, but it was very difficult, Wang Yinan was not sure at all whether this part could be implemented at the beginning.

But someone sent a pillow when he was sleepy, Wang Yinan secretly thanked the rice country in his heart, and the little insects on the edge of the South China Sea, without you, my David, there is no way to find a weapon to take advantage of.

Holding back the snickering joy in his heart, Wang Yinan hesitated, with an embarrassed expression on his face, it seems that he has been messing with Zhou Hui for a long time, and his acting skills have also made great progress.

"Actually, it's really not impossible to do this," Wang Yinan said.

"Really", Deng Lao immediately jumped up, "What way do you say, ask for money for money, ask for people to give people",

"It's certain to ask for money and people, but it's far from enough," Wang Yinan said.

"What other conditions, you say", Qian always knows Wang Yinan's urine, so he must get enough benefits.

"First of all, we need the strong support of the 116 Institute," Wang Yinan said.

"This is no problem, I can promise you now", Qian Lao is very refreshing,

"There is also a crucial condition, if you don't agree, then everything will not be discussed",

Wang Yinan continued.