A big country of aerospace with black technology.

Jiangcheng, [-] Satellite Research Institute.

Since the start of the low-orbit communication satellite project three years ago, the satellite research institute has also begun to expand rapidly.

This year, a large satellite industrial park was directly built.

"Director Zhong, I'm sorry to bother you this time."

Zhang Xingyang smiled and said apologetically.

"Nothing, these are what we should do."

Zhong Zixin did not feel any trouble.

And even if it was really troublesome, for Zhang Xingyang's sake, it had to be done.

After all, if it weren't for Zhang Xingyang's proposal, there would be no low-orbit communication satellite project, and there would be no [-] Satellite Research Institute today.

"In terms of early warning satellites, I will trouble you to pay more attention."

This time, Zhang Xingyang made a special trip to the Satellite Research Institute for the professional missile early warning satellite.

This is also after the development of Dongfeng-17 was completed, and the country suddenly discovered that its existing means could not prevent such an attack.

It was decided that a complete professional missile defense system must be developed.

In this system, professional anti-missile reconnaissance satellites are an extremely important part.

"Dean Zhang, the development of infrared detectors may still take a certain amount of time."

Although there are certain difficulties in the development of new satellites, Zhong Zixin still patted his chest and said:

"However, we will definitely be able to complete the development of the satellite before the end of the year."

Missile early warning satellites mainly use high-sensitivity infrared detectors to detect ballistic missiles by detecting tail flames when ballistic missiles are launched.

However, this detection method also has certain problems.

That is because the recognition accuracy of heat sources is not particularly high, resulting in a relatively high false alarm rate, and the recognition efficiency of natural phenomena such as fires, volcanic eruptions, and meteorites is relatively low.

It is necessary to upgrade the program on the basis of the existing infrared detection equipment, so that the detection equipment can filter out those infrared signals that obviously do not meet the characteristics of the missile.

For example, a large-scale, low-calorie infrared signal such as a fire.

"It must be noted that the accurate identification of the heat source characteristics of the missile, even if the identification accuracy is slightly lower, cannot filter out possible heat source information."

After Zhong Zixin mentioned the infrared detector, Zhang Xingyang couldn't help exhorting.

Zhang Xingyang's concerns were not unfounded. In the wars of later generations, such situations had occurred before.

Because the heat source identification feature threshold is relatively high, after the enemy's missile was launched, the early warning satellite did not find it in the first time, which eventually caused a major loss to the command center.

The reason is simply that their missiles have changed the fuel recipe and lowered the temperature of the engine nozzles.

In my memory, although the vivid case has not happened at this time, it does not prevent Zhang Xingyang from making preparations in advance.

"Ionization detectors must be indispensable. This is an important means of detecting ballistic missiles."

"Double detection can greatly improve the accuracy of satellite early warning."

Now that he had already said a lot, Zhang Xingyang couldn't help but say more.

Ionization detectors detect ballistic missiles by detecting disturbances in the ionosphere of the atmosphere.

During the launch and ascent of the missile, when it enters the ionosphere, the engine exhaust will cause a lot of disturbance to the ionosphere.

Compared with infrared detectors, this detection method has a much higher accuracy rate.

But this method is not without disadvantages, because it can only be found when the missile enters the ionosphere, so the speed of discovery is much slower. At this time, the missile is about to enter the middle atmosphere and fly outside the atmosphere.

Of course, the dual methods of infrared detection and ionization detection can avoid the defects of both.

After the infrared detector finds the special heat source on the ground, the ionization detector will conduct the next step of detection of the heat source.

After the infrared detector finds a special heat source, it will notify the ground radar station and the command center.

In fact, in the entire missile defense system, the ground radar station is also a very important part.

Ground radar is mainly meter-wave radar. Compared with ordinary radar, the operating range of this radar is that the operating range is very far, generally reaching thousands of kilometers.

But they are also not perfect, and their shortcomings are obvious. The tracking accuracy is very poor, they cannot provide accurate detection, provide guidance for anti-missiles, and can only be used as warning radars.

And even so, the long-range early warning radar cannot give early warning at the moment of missile launch.

The early warning radar must be detected when the missile is launched to an altitude of several thousand meters.

This is mainly determined by the physical characteristics of the radar wave itself.

And because the earth itself has curvature, this kind of radar has a lot of low-altitude blind spots.

In the 70s, China also carried out a similar long-range early warning radar design.

Today, in the mountains in the north, you can still see a huge engineering relic, which is the 640 radar of the 7010 project.

This huge hillside-based radar array faces the north, and its goal is to warn of nuclear missiles that may be thrown by its northern neighbors who were not on good terms at the time.

"Master Zhang, don't worry."

Zhong Zixin also understood Zhang Xingyang's worry, although Zhang Xingyang did not specify the specific use of the satellite.

But judging from the various equipment above, this satellite is mainly to defend against intercontinental ballistic missile attacks from across the ocean.

"Our current technical strength, as you know, such technical parameters are not difficult for us."

On this point, Zhang Xingyang still agrees.

After undertaking the research and development of low-orbit communication satellites, [-] Satellite Research Institute not only built a new satellite industrial park.

The most important thing is to attract many domestic and foreign talents.

After all, at this time, in a world that has just experienced a financial bubble, many original rocket and satellite projects are unsustainable.

The technicians in the original projects had no place to go. At this time, the [-] Satellite Research Institute, which has many satellite development projects, offered them an olive branch.

"Your technical strength is indeed good, but this time the satellite is a geosynchronous orbit satellite, and the satellite platform must be done well."

Although in the past three years, [-] Satellite Research Institute has produced many communication satellite models.

However, these satellites are generally small in size, mainly because communication satellites are only planned to be used for two or three years.

But the missile early warning satellites needed this time are different, because it is necessary to monitor most of the areas above the earth as much as possible, and must be deployed at higher orbital altitudes.

And it will be used for 15 years, which makes the early warning satellite a large satellite.

When Zhang Xingyang and the others formulated the technical requirements, they calculated that the weight of the satellite was at least three tons.

This is almost completely different from communication satellites that weigh only four to five hundred kilograms.

Higher requirements are also put forward for the satellite platform. There are not many platforms that can be used by domestic geosynchronous orbit satellites.

Currently the most advanced satellite platform is the Dongfanghong-[-] platform.

The full three-axis attitude stabilization technology is adopted, which can keep the satellite's attitude stable at all times in space, instead of spinning due to a little change.

Two-component unified propulsion technology, carbon fiber composite structure and other technologies.

However, even this most advanced satellite platform in China is still a bit too small for Zhang Xingyang's current requirements.

The power of many devices has to be limited to a certain extent.

This also made Zhang Xingyang raise higher expectations for their satellite development work:

"Director Zhong, the research and development of large-scale satellite platforms still needs to be continuously advanced."

"In the future, we will have more and more demand for large satellite platforms in geostationary orbit."

In fact, with the development of the country in the future, the demand for various large satellite platforms will become very large.

Whether used for communications or for space exploration, these satellite platforms are indispensable.

"We have very little experience with large satellite platforms."

"If you want to develop, there are still many difficulties."

When Zhong Zixin mentioned this topic, he also felt powerless.

Large satellite platforms are different from low-orbit satellites because they have a longer service life and more power, and there are more problems on the satellite.

Even just the heat dissipation of satellites is a serious problem.

Unlike the abundance of matter above the ground, heat dissipation can be carried out through constant heat exchange.

In space, especially above the geostationary orbit, the density of matter is very low, and it is very difficult to exchange heat with the environment.

And if the satellite platform cannot be dissipated, the internal heat will continue to rise and accumulate, which will eventually have a serious impact on the many precision equipment inside.

Therefore, the heat dissipation system of a large satellite platform must be efficient enough to dissipate the heat generated during the operation of the equipment on the satellite in a timely manner.

And that's just the tip of the iceberg of difficulties with large satellite platforms.

They need to overcome difficulties such as advanced satellite structure design, high-power power supply and distribution system, advanced integrated electronics, and high-thrust multi-mode electric propulsion system.

"You guys should work harder. If you have any special difficulties, call me if you can't solve them."

Zhang Xingyang glanced at his watch, left a word with Zhong Zixin, and was about to leave.

"At present, we are not short of equipment, talents, and funds. The only thing we lack is time."

Zhong Zixin said with a little emotion.

In fact, it's not that they can't make the large satellite platform just mentioned, but the time is not easy to say.

It may take several years to make a sufficiently mature product.

But now Zhang Xingyang doesn't have that much time for them, which puts a lot of pressure on Zhong Zixin.

"Everyone is short of time now, not just you."

In fact, Zhang Xingyang's time is even more tense, he can't wait to use every 1 minute of time into 2 minutes.

It's just that he is still relatively young, and his body can still support it.

Otherwise, according to his current work intensity, if someone else came, he might have already collapsed.

After saying goodbye to Zhong Zixin briefly, Zhang Xingyang boarded his bulletproof car.

Since the successful experiment of Dongfeng-17 hypersonic ballistic missile, Zhang Xingyang's security level has been raised to a higher level.

Traveling now, the security personnel around are almost inseparable, and basically bid farewell to civil aviation.

This is also because he is currently in charge of many high-secret projects, and his life safety must be guaranteed to a certain extent.

"Go to the supercomputing center."

Zhang Xingyang said to the driver sitting in front.

Jiangcheng Supercomputing Center was just put into operation this year.

It was built next to a large lake in Jiangcheng, mainly using the lake water to physically cool down the servers of the supercomputing center.

The ownership of the Supercomputing Center belongs to the Rocket Research Institute, which was originally used to simulate and calculate the aerodynamic model of the new deep space rocket.

But now it has a new owner and a new purpose.

For this reason, Zhang Xingyang also did ideological work for many people in the research institute, especially Qiao Yang who had been looking forward to the stars and the moon until the supercomputing center was completed.

Before the completion of the supercomputing center, Qiao Yang had been complaining that the small supercomputers in the research institute were not powerful, and many models could not run.

After finally waiting until this time, the supercomputing center, which is not considered backward even in the world, suddenly disappeared again.

It was really hard for Qiao Yang to accept it, but in the end Zhang Xingyang made him accept it with his charisma.

And promised that the Rocket Research Institute will build a more advanced supercomputing center in the future.

The change of purpose of the supercomputing center is also for the missile defense system.

If you want anti-missile missiles to accurately hit incoming missiles, you must use supercomputers to calculate the trajectory of ballistic missiles.

However, it will take at least two years to build a new supercomputing center temporarily.

This is a relatively long time for the establishment of a missile defense system.

"Director Zhao, we meet again."

Arriving at the supercomputing center, a tall and straight middle-aged man was already waiting at the door.

After Zhang Xingyang got off the car, he took the initiative to greet him and shook hands with him warmly.

Zhao Bingzhi, formerly the director of the Computer Research Institute, is now the director of the Jiangcheng Supercomputing Center.

Specially responsible for building the supercomputing model in the missile defense system.

"haven't seen you for a long time."

Zhao Bingzhi is relatively introverted, and he is not particularly enthusiastic about others.

Zhang Xingyang also knew this, so after a simple greeting.

While walking to the supercomputer room with Zhao Bingzhi, they talked about the technical issues of supercomputing.

"How is the supercomputer running now?"

The supercomputer in the Jiangcheng Supercomputing Center comes from Sugon, and its peak calculation speed can reach 4032 billion times per second.

The technical level can already be regarded as first-class in the world.

Compared with the Yinhe-2 supercomputer used by Zhang Xingyang at the University of Science and Technology of China before, the performance has improved hundreds of times.

"The supercomputer is running well, and the peak calculation speed in the current test has reached 3980 billion times."

Zhang Xingyang was satisfied with Zhao Bingzhi's answer.

There is only a difference of 50 billion times from the theoretical peak calculation speed. The gap is not very big, and it is still acceptable.

However, what Zhao Bingzhi said afterwards made Zhang Xingyang serious:

"However, our current model does not seem to be ideal, and the trajectory accuracy rate is less than 50.00%." ​​(End of this chapter)