Military Technology

If it is simply to send payloads such as satellites or spacecraft to different orbits, this general launch vehicle can do it.

But if you want to send six or seven, a dozen, or even dozens of satellites into different orbits at the same time, you need an upper level.

To put it bluntly, it is also a first-stage rocket, but it is more flexible than ordinary rockets and not only has the ability to change orbits flexibly. Moreover, its engine can be ignited multiple times, can run in orbit for a long time, and has a relatively strong space transfer capability.

The reason why Wu Hao and the others developed upper-level technology is to improve the rocket's carrying capacity, especially in deep space and on different orbits.

Of course, this is only one reason. On the other hand, it is also their hope that they can use this to develop multi-star technology with one arrow.

On the basis of the original technology, Wu Hao and the others have also carried out relevant improvements and optimizations to make the multi-star technology with one arrow here more excellent.

First of all, in terms of quantity, it is different from the current multi-satellite technology of many countries, which can send two or three, or four or five satellites into the sky. Wu Hao and the others hope that with the help of this technology, they can send a dozen or even dozens of satellites into space.

The second is in orbit. Wu Hao hopes that this upper stage can send a dozen or even dozens of satellites on it to different orbits.

At present, the multi-satellite technology with one arrow has developed rapidly. Companies in various countries have experimented or already used this technology, and have successfully sent dozens or dozens of satellites into space.

For example, the Starlink project promoted by Musk has sent 60 satellites into space at a time, which can be said to be very remarkable.

However, these multi-satellite technologies can only send these satellites to the same orbit. That is to say, after the launch vehicle sends multiple satellites to the predetermined orbit, these satellites are released in sequence.

However, there is a problem with this, that is, the orbit where the rocket releases or throws the satellite is a curved upward trajectory. But if you look down from the top or look up from the bottom, the curve will become a straight line. That is to say, they are still on the same orbit, but at different altitudes.

In this way, it seems to solve the problem of multiple satellites crowding on the same orbit.

But this is only temporary, except for the geostationary satellites on the equator, all other satellites will gradually reduce their altitude due to fuel consumption during operation.

There are also differences in performance between satellites, and these satellites have different descent times and speeds, so there is a lot of risk.

The falling satellite may affect the safety of the earth orbit satellite, thus colliding, or even bring a series of chain reactions.

For example, the popular Starlink project in recent years, Musk used the Falcon rocket to launch 60 satellites into space at one time.

But the sixty satellites are a string of pearls, which means they are all in the same orbit. So on a clear night, we will often see a string of satellites transiting in the sky.

What Wu Hao and the others want is not this long string of pearls, but the ability to send more than ten satellites to different orbits.

Really like a space bus, sending these satellites to their intended destinations.

So this technology is still relatively difficult, and its difficulty is no less than that of a spaceship.

To achieve precise control of the upper level, only in this way can each satellite be placed on its own different and accurate orbit.

At present, in the field of satellite technology, countries and companies no longer simply pursue weight and volume, but are increasingly focusing on some tiny satellites.

Compared with ordinary large and medium-sized satellites, micro-satellites have unique advantages. First of all, its biggest advantage is cost. The cost of microsatellites is very low, and the cost of a satellite may even be the price of a smartphone.

For example, many college student research teams have developed many mobile phone satellites. In fact, the theme of the mobile phone satellite is the mobile phone. Relying on the mature electronic components and equipment on the mobile phone to carry out certain transformations, a satellite is manufactured. The manufacturing cost of this kind of satellite itself is very low, and its most expensive part is the launch.

If the traditional one-to-one single launch method is used, such a mobile phone satellite will have to pay for the launch cost of the entire rocket, which is very expensive.

Even if several such tiny satellites are launched into the sky using the multi-satellite technology, the average price will be very high.

So how to reduce costs has become a question that scientists and technical experts have been thinking about.

Secondly, this kind of tiny satellite is convenient to manufacture, convenient to transport and launch, and convenient to deploy, and it is also conducive to launching and deploying a large number of tiny satellites at one time, so as to fight against the enemy's range-line weapons.

Also because of these advantages, the development of small satellites and micro-satellites is very rapid.

In recent years, with the opening up of the country in the aerospace field, more and more scientific research institutions and companies are also developing their own small satellites and microsatellites.

Wu Hao and the others saw the broad development prospects of this market, so they started this project. It is hoped that with the help of the upper stage, many satellites can be launched and transported at one time, and they can be transported to different orbits.

In this way, coupled with the retractable launch vehicle, the launch cost shared on each small satellite and microsatellite will be greatly reduced.

This will not only allow these R\u0026D teams to take over, but also drive the development of the industry. It is also a good thing for Wu Hao and the others. This move can not only compete for this part of the order to open up the market, but also greatly promote Wu Hao and the others in the field of aerospace technology, especially spacecraft technology, orbit change technology, and deep space exploration. .

So Wu Hao is very concerned about this project, so he started to ask.

Hearing Wu Hao's greeting, Yu Chengwu nodded with a smile and said: "The project is progressing smoothly, and our preliminary plan is to divide the whole project into three steps.

The first step is to develop and manufacture five to ten upper-level spacecraft, which can meet the launch requirements of the current two types of rockets, and can send five to ten small satellites to their respective predetermined orbits at a time.

The second step is between ten and thirty, that is to say, we can put up to thirty small satellites or tiny satellites on different orbits.

This has almost reached the maximum transport load of our Jianmu-2, so this upper stage will also be the main force of our launches for a long time to come.

In the third step, we plan to increase the scale to about 30 to 100 large upper stages, so as to realize sending about 100 small satellites or tiny satellites into different orbits.

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