Rebirth 2008: I Can Make Money Reading

After the start of construction, Mu Yang began to inspect the progress of the satellite project.

Came to the lab and saw them testing the performance of the battery.

A battery is installed on the satellite, and the battery mainly supplies power for the communication system.

The solar array absorbs energy and mainly charges the battery.

There are generally two types of satellite batteries, one is nickel-cadmium batteries and the other is nickel-metal hydride batteries.

Under the same weight, Ni-MH has 30% more power reserve than Ni-Cd batteries, is lighter than Ni-Cd batteries, and has a longer service life. The disadvantage is that the price is much more expensive than Ni-Cd batteries, and the performance is worse than Li-ion batteries.

Nickel-metal hydride batteries do not contain "hydrogen", but metal hydrides such as potassium hydroxide (koh), which are alkaline batteries like nickel-cadmium and lithium batteries, which are different from lead-acid batteries.

Nickel-cadmium batteries have dominated satellite applications for the past three decades.

The application of Ni-MH batteries is relatively late, and self-discharge is a problem.

Xinghai Group's satellites use nickel-metal hydride batteries, which are developed with the assistance of the company's battery project team. There are also batteries of this type sold in the market, such as AA 5 and AA batteries, which are not expensive, but they do not meet the requirements of Xinghai Group satellite batteries.

Satellite batteries are required to have a long life, at least ten years, and more than 10,000 times of charging, and general civilian nickel-metal hydride batteries cannot meet this requirement.

After all, it is impossible to change the battery for the satellite. If the battery is broken, the life of the satellite has come to an end.

If it is an exploration satellite for interstellar travel, the life expectancy is longer.

Ni-MH batteries are also self-discharging. Today they may have a capacity of 10ah, and after a while, they may only have a capacity of 9ah. This will also happen to other types of batteries. If they are not used for a long time, they suddenly find that the power has decreased. this means.

This problem may be a fatal problem for projects that require long storage time.

After observing for a while, Mu Yang saw Lu Ding, the R&D manager of the project team, and asked casually, "Dr. Lu, what is the capacity of the Ni-MH battery pack you use?"

Lu Ding replied respectfully: "Chairman, according to the design requirements, 200ah ampere hours."

[1ah=1000mah, 200ah is roughly equal to the battery capacity of seventy or eighty mobile phones; if the discharge current is 1a, the discharge time is 200 hours]

Mu Yang converted, if the output voltage is 12v, then a battery like 1ah w=12*1*3600/(3.6*1000000)=0.012 kWh.

For a battery pack like 200ah, w=12*200*3600/(3.6*1000000)=2.4 kWh=2400wh.

The power required by the communication system is between 500w-6000w, which has a lot to do with the quality of the satellite. If it is a high-power communication system, if the satellite load is 500 kg, 200ah is enough.

The original design weight of Xingdou No. 1 is about 278 kilograms. According to the routine, the capacity of the battery pack must be sufficient.

Xingdou-1 is different from ordinary satellites. It not only communicates, but also has remote sensing and reconnaissance functions. It is a combination of optical satellites and radar satellites. It is the first of its kind in the world, so it requires a larger battery capacity.

In fact, such a Ni-MH battery pack is not heavy, about one kilogram, plus other accessories, it is only two or three kilograms.

On the contrary, the solar battery array occupies a relatively large weight, and its specific power is between 10-50w/kg. It belongs to monocrystalline silicon solar panels, and its conversion efficiency is about 24%. From this data, it can be seen that its charging efficiency is very low. .

If the battery pack weighs 20 kg, it will take about 30 hours to fully charge 200ah, and the efficiency is still slower.

It doesn’t matter if the capacity of the Ni-MH battery is larger, as long as there is enough power to supply power when the sunlight intensity is weak during the aphelion period of the sun, it mainly depends on the charging power of the solar battery array. If the area of ​​the solar panel is small, the power is small and cannot meet the needs Require.

Mu Yang emphasized: "The satellite project has a lot of technologies to solve. When the project was established, I reminded that the rocket Xingkong-1 has a strong carrying capacity, and there is no need to pursue lightness too much.

The higher the precision, the easier it is to break, and the higher the cost, you should pay attention to this.

On the other hand, our plan is not to launch a few Xingdou-1 satellites, but to plan 20,000.

According to theory, our launch cost is not high. Even if the launch cost of the Xingkong-1 rocket is 10 million yuan for one launch to Leo, the average cost per ton of payload is only tens of thousands of yuan.

If the manufacturing cost of satellites can be reduced, if each satellite saves 500,000 yuan, 20,000 satellites, we can save 10 billion yuan. "

The manufacturing cost of Musk's Starlink satellite is about 500,000 US dollars. The satellite is flat, with a size of 3.2x1.6x0.2m. The v0.9 type weighs 227 kg, and the upgraded v1.0 type weighs 260 kg, which is small satellite.

Xingdou-1 of Xinghai Group is also a small satellite, which not only has communication functions, but also reconnaissance and other functions.

The function of the world's first Xingdou-1 satellite will not be made public, but the payload capacity of the Xingkong-1 rocket cannot be concealed, and it will definitely shock the world.

It was also quickly guessed that the Xinghai Group used a non-ordinary rocket engine and that abnormal thrust.

Miracles can be achieved with great efforts, even bricks can fly.

Playing is different.

Lu Ding said: "Chairman, our previous design weight is 278 kilograms. According to the carrying capacity of Xingkong-1, Xingdou-1 satellite does not need to be light-weight. It is okay to weigh more than 300 kilograms, or even heavier. No problem, we could save a lot of money that way."

"The weight design requirement of 278kg that I gave before is indeed unreasonable, this is my problem.

I see the design optimization plan you submitted, you have optimized a lot, but you are still a little conservative.

You're right, in fact, it doesn't matter if Xingdou-1 weighs more than 100 kilograms, as long as the quality is stable and not afraid of collision, even if the final design weight reaches 400 kilograms.

But our single manufacturing cost can save hundreds of thousands to millions, and the launch cost is only tens of thousands of pieces, which is worth it. Mu Yang replied, "Well, let's call the core personnel of the project team in the afternoon, let's reorganize the design concept, and I will go through the review and confirm it." "

If the satellite is heavier, the power requirements are higher.

The design drawings given by the system are also correct, and the structure is more compact, but the system does not take too much into account the manufacturing cost, nor does it take into account the load of Xingkong-1.

The system is dead, but people are alive.

The structure may not be modified, but some expensive materials can be replaced with cheap and reliable ones. As long as the performance and functions are not affected, the precision of the parts can be reduced by one or two grades, which can save a lot of cost.

At two o'clock in the afternoon, Mu Yang and the scientific researchers of the satellite project team held a design meeting to re-examine the design issues of Xingdou-1.

After three hours of discussion, a new optimization plan was released.

This is not a new design, just replacing expensive parts and materials, otherwise it will not be settled in two or three hours.

The final plan is to reduce the manufacturing difficulty without affecting the function, and at the same time increase the structural strength. The final theoretical weight reaches 350 kg, and it is estimated that the manufacturing cost of each satellite can be reduced by one million yuan.

Of course, the weight has increased, which also means that more fuel reserves are needed to adjust the satellite attitude in case of emergencies.

Although after the optimization of Xingdou-1, some of the previous work was done in vain, but the difficulty of development has been reduced, and the overall process has not changed.

At the meeting, Mu Yang conducted self-criticism, and did not organize the meeting to set a general direction in time. He also hoped that everyone would find a problem, dare to refute it, and not talk about it.

Mu Yang and the researchers of the project team all look forward to the successful development of Xingdou-1, the world's largest wifi, and high-definition resolution.

Through the star network, you can view the global landscape and explore the mysterious areas of the earth without going out.

However, there are quite a lot of problems to be solved on Xingdou-1, and the scientific researchers of the project team have encountered many problems, some of which even Mu Yang has a headache.

It is one thing to have technical information, but another to be able to develop it.

Brain: "I will!"

Hand: "No, you won't!"

In fact, this is the truth.

Mu Yang inspected the battery project team, and then inspected other scientific research groups of the satellite project.

The current progress is not bad. It is estimated that samples will be produced in May, debugging will be in June, and large-scale assembly with Xingkong-1 will be put into use in July and August, and it will be able to catch up with the actual launch of the rocket to Leo.

From 2008 to 2016, nearly eight years of waiting, this year is finally coming to this point.

The development of aerospace is not fast, but the foundation has been laid well, which is different from others. Xinghai Group is ignoring climate change, high payload, stable recovery rocket and many other complex technologies, each of which is the world's first.

Choose a good weather to launch the rocket?

no!

Launched to leo only a dozen tons?

That must not work!

Rocket recovery?

Well, this is based on Musk, not the first.

The problem is, the space company of spacex has not really made it.

According to history, the first successful recovery of SpaceX rocket was on December 22, 2015, until April 8, 2016, SpaceX successfully recovered the "Falcon 9" rocket at sea for the first time.

Now Mu Yang has been tossing about it, and I don't know how long it has been delayed, but it must be under development, and it depends on who realizes it first.

Therefore, Mu Yang said that the rocket recovery technology was first created by the Xinghai Group, so he didn't blush!

Besides, mine is more advanced than Musk's rocket recovery technology!

…

a few days later,

February 22, 2016 is the Lantern Festival.

Musk's space exploration company SpaceX has announced plans for satellite internet services.

SpaceX plans to launch about 12,000 communication satellites into orbit and begin work in 2021.

The project was named "Starlink" (starlink).

The project outlines more details about the Starlink project, including providing telephone services, emergency backup services for voice calls, and participating in the government's lifeline program to provide cheaper telecommunications services for low-income earners.

The 4,408 satellites in the first phase operate in a 550-kilometer orbit, mainly using the ku and ka frequency bands, with a single-satellite communication capacity of 20gbps and a system-wide data throughput of 100tbps.

The 7,518 satellites in the second phase are orbiting at 340 kilometers, and the V frequency band is added on the basis of the Ku and Ka frequency bands in the first phase.

The 30,000 satellites in the third phase add the e-band on the basis of the ku, ka, and v-bands, and the available bandwidth has increased by 3 times to enhance the system capacity.

After Musk made this announcement, he was very proud: Occupy first is king!

It's not my fault!

I act according to the rules. If you have the ability, you can also engage in Starlink. Our rocket recovery technology will soon be successful!

…

As soon as the announcement came out, there was a worldwide sensation and discussions were in an uproar.

too suddenly!

When the news reached Hua's country, the response was fierce, and the comment section of the portal website Wangyi reported that there was a lot of discussion.

"Isn't this satellite launched at an altitude of more than 30,000 kilometers? Why is it at a few hundred kilometers away?"

"A few hundred kilometers away is a near-orbit, and a distance of more than 30,000 kilometers is a geosynchronous satellite."

"It seems that the geostationary satellite with a distance of more than 30,000 kilometers is also a communication satellite, and only three satellites are needed to cover the whole world. Why not directly launch it to more than 30,000 kilometers?"

"The signal attenuation is serious at a distance of more than 30,000 kilometers. The satellite needs a giant antenna with a diameter of more than ten meters, which causes a communication delay. It takes 240 milliseconds for the signal to be sent from the ground to the satellite. 3.3 milliseconds is fine."

"Why can this foreigner occupy all the resource space? Isn't there any country in the world that occupies how much?"

"The ones upstairs don't understand. The International Telecommunication Union adopts the principle of 'first come, first served' for orbit and spectrum acquisition, just like moon landing and asteroid mining. If you are good at it, you will get it."

"Whoever is better than others will occupy it. In the final analysis, it is the right of speech for developed countries to use advanced technology."

"Hey, the Xinghai Group is also engaged in rocket launches. It was exposed a while ago that they are transporting rockets. There has been no progress recently. It seems that this rocket launch is not easy to do."

"The foreigner's star chain is really powerful, and it's okay for the Xinghai Group to lose to others occasionally, it's not normal!"

"Xinghai Group has a lot of powerful technologies, but they have already flown out of the earth, so there is still some gap."

"The **** gap, Xinghai Group can definitely do it, they just didn't launch it."

SpaceX's Starlink project has indeed made Chinese people lament that Xinghai Group's aerospace development started too late. Seeing that everyone is engaged in Starlink, Xinghai Group's rocket has not yet launched.

Most Huaguo netizens are still very supportive of Xinghai Group, and some are not optimistic about Xinghai Group, which is normal, no matter how popular Mu Yang is, there will always be people who will hack him.

A netizen who is known as an aerospace expert analyzed that "the ultimate purpose of the 'Starlink' satellite is to enclose space in space, compress the space for other countries' space exploration, and intercept intercontinental ballistic missiles for the king, destroying satellites of other countries. And Starlink's high-speed Internet Business is just business that comes along."

This analysis, most netizens think it is reasonable,

However, there are still some netizens who retort: ​​"Bullshit bricks, don't know how to pretend to understand, satellites only have that little power, how can it be possible to intercept missiles, you said that it is possible to obtain missile trajectories more accurately, auxiliary interception and active interception are two different things.

Unless there are laser weapons installed on the satellite, but SpaceX's is a small satellite, with that little battery capacity, it's a hairy laser. "

This netizen refuted it and got a lot of praise from netizens. Such an analysis is really reasonable.

Most netizens are patriotic, and feel that foreigners' satellites cannot intercept satellites, which makes them less worried.

But no matter what, Hua people are definitely not happy to be occupied by foreigners using high technology to occupy space resources.

The upper-level leaders have also seen the news, and after analysis by relevant experts, if the near-orbit is really occupied by people, it will indeed be very detrimental to the country of Hua.

However, Hua Country’s rocket launch technology cannot be recovered, and the cost of launching tens of thousands of satellites is too high. If it really wants to compete with SpaceX, what is the difference from the space race between Ugly Country and Xiong Country decades ago? dragged down the domestic economic development.

The space race is completely a big pit.

The launch cost of spacex is low, which is incomparable in China, which is very helpless.

In response to this matter, the upper management held a meeting to discuss it.

"How is the progress of Xinghai Group's rocket development?"

"I got the news from there that it is still undergoing large-scale assembly, and it is estimated that it is still far away from the real launch. We don't know the specific technical situation of the Xinghai Group. The young man likes to hide it. However, even if the development is successful, it should not so good."

"The successful launch of satellites by private enterprises is already a great improvement. It is impossible to become a fat man by eating one bite. SpaceX also receives strong support from the government. Many of their scientific researchers are scientific researchers from Uganda Space Corporation."

"Well, don't put too much pressure on the Xinghai Group. They have already helped the country solve so many technological problems. Looking forward to the Xinghai Group, we should reflect on it."

"It's time to reflect. 10% of spacex's scientific research personnel are from Qinghua, and they are all the technical backbone of rocket research and development. We can't keep them in China. In the end, we let our own people help others to research technology to deal with our own people. This is very sad. Mu You are right, sir, there is no bottom line in scientific research.” The old man was very angry when he talked about the loss of top talents.

It's not his fault, if it's general technology, he won't say anything.

But the layout of rockets and satellites involves national security, and if one's own people fight against one's own people, what is that?

Traitor!

It is more hateful than the traitors decades ago!

The traitors in that era were not very capable, but the traitors with top technology were too harmful.

"Okay, it's useless to blame others. Everyone has their own ambitions, and we can't force them. We should find problems from ourselves."

"Our development has not been slow in recent years. Aerospace development should not be eager for quick success and quick benefits. It must be down-to-earth and steady. If we fail once, it will be a great loss to us."

"At the beginning, the International Telecommunication Union adopted the 'first-come, first-served' principle for orbit and spectrum acquisition, which was a pitfall for us."

"Don't talk about the past, it is very difficult to change the established rules. We can only wait and see for a while, and at the same time do what we need to do, be ourselves, and not mess up the steps."

The upper echelon of Hua Country is worried that many countries oppose SpaceX's Starlink project.

However, Musk publicly refuted in an interview: Preemption is king and doing things within the rules.

He almost said: If you have the ability, you can occupy it yourself. It's not my fault!

Others are also very helpless, there is an ugly country behind them, and their technology is indeed powerful.

Netizens in Huaguo were angry and helpless when they saw Musk's interview and answers. They can't blame anyone, who told us that we are incompetent.

…

Mu Yang soon learned that the news released by spacex was a whole year later than the announcement in his previous life.

The announcement of SpaceX's Starlink program means that the curtain has finally opened.

When he saw the announcement, he was not worried, and the corners of his mouth could not help but curl up.

Finally the wait came.

He doesn't have to worry about the early stage. The Starlink project is one thing. It is very difficult to launch 12,000 satellites or even more.

In the previous life, until 2022, only two to three thousand Starlink satellites were launched, far from the planned 12,000.

Therefore, if Xinghai Group does not disclose its Star Network plan for the time being, it is estimated that SpaceX will still proceed slowly.

Then let Musk launch first, and he won't be able to launch a few satellites in the first year.

If the Xinghai Group wants to do it, it will launch without restrictions.

According to Xingkong-1's ignorance of the climate, the three assembly plants can theoretically launch three times a day.

If according to the new design of 350 kg per Xingdou-1, Leo's near-orbit load capacity of 200 tons may not be able to carry 200 tons due to space problems.

Under full load, the theory is that it can carry 571 Xingdou-1~www.readwn.com~ let alone 571 satellites, as long as it reaches 400 satellites.

25 launches are 10,000 satellites. In theory, Xingkong-1 can be launched 50 times a month, directly launching 20,000 satellites into near-orbit.

In a month's time, it is estimated that the opponent and the ugly country will be frightened.

Therefore, Mu Yang is in the plan.

He doesn't plan to launch too many satellites until he collects enough 20,000 satellites. He will launch at most one or two experiments in the early stage, and the carrying capacity of Xingkong-1 is temporarily concealed.

But as long as hundreds of satellites are carried at a time, the carrying capacity of the Xingkong-1 rocket will definitely be exposed, that's for sure.

If not, the 20,000 satellites will be launched only after one or two years, and when Ugly Nation reacts, maybe the rules will be changed to prevent Xinghai Group from launching so many satellites.

So, launch in one go!

Am I done launching and want to destroy myself?

That is impossible!

If you have the ability, you can fight it down yourself!

One for one, Ugly Country feels that it is not worthwhile to think about the cost of exchanging injuries for injuries.

Hey, I can only keep a low profile for a while.

The idea is very good, but there are many technical problems to be solved, and Mu Yang knows that there is no rush. As the leader of a large enterprise, he must calm down.