Tiangong Space Station.

Nie Changfeng and He Zhen, who were stationed in the station, had a clear division of labor.

As the captain, Nie Changfeng is mainly responsible for general control, communications, and cooperation in scientific research; while the team member He Zhen is responsible for space operations and equipment maintenance.

When the Shenzhou spacecraft successfully returned to the ground, the Tiangong Space Station also officially entered its working state.

The current Tiangong Space Station has a total weight of 295 tons after six launch missions, which is about three-quarters of the International Space Station; the internal space volume is 732 cubic meters, which is about seven-ninths of the International Space Station.

It has 18 independent space capsules and 3 new space capsules to be assembled. The space and materials on it can allow 2 to 4 people to survive in the space station for a long time.

If the three new space stations are assembled, the internal volume of the Tiangong Space Station will be increased to 844 cubic meters.

Node 5 is the location where the new capsule is assembled.

After wearing the space version of the exoskeleton armor, He Zhen opened the air-tight gate and started working outside the cabin. He first buckled two fixed ropes, one end on his body and the other end on the fixed handle in the cabin.

The assembled space capsule is somewhat different from the assembled space capsule on the ground. He first installed four main skeleton columns at the connection part of the node compartment.

Next, assemble the sub-skeleton modules one by one according to the number, just like installing puzzles.

After installing the skeleton, the outer composite protective layer is mainly used to defend against space garbage impacts, high-energy particles, solar storms, and radiation heat dissipation layers. These are all combined on the outer composite layer.

The inner composite layer mainly uses airtight, thermal insulation, radiation protection and fire protection.

The most important thing is the pipeline system and electrical system inside.

He Zhen spent a week assembled three space capsules, tested the airtightness and a series of other functions one by one. Although he encountered some minor problems, he still overcome them one by one.

The three new space capsules, except for one node capsule, the other two space capsules, one is the data capsule, equipped with three large servers; the other is the communication experiment compartment, used for communication experiments.

When the three space capsules were put into use, Nie Changfeng came to the communications experiment cabin, controlled the equipment inside, and fired a positioning laser to the ground.

[Tiangong, Tiangong, here is Qinghai, laser positioning is accurate.]

Nie Changfeng picked up the communicator and replied with a message: [Tiangong received it, and 5 minutes later, the first experiment was conducted.]

[Received in Qinghai.]

Nie Changfeng opened the control panel of the laser transmitter, edited the information, and started to start the communication laser and emitted a communication laser to the Qinghai station.

Soon the Qinghai station received the communication laser signal.

In the communication experiment cabin, communication lasers are continuously emitted to the ground, while Qinghai Station, Changbaishan Station and Wuyishan Station on the ground are also transmitting communication lasers to the space station.

Nie Changfeng activated the camera in the experimental cabin and tried to synchronize his picture to the ground.

After a while, the other party's screen appeared on the monitors of both parties. Although they were wearing a delay of about 0.05 seconds, the download and upload of communication information reached 9.6GB and 9.2GB per second, which is a considerable communication density.

Of course, laser communication has many limitations, such as the need for special equipment, which is susceptible to weather, and must aim to communicate.

As a sloppy space between outer space and the ground, between space, it is fine.

If you want to apply it to the civil market, such as Musk's Starlink Plan, it will be used at most for sea ships, unmanned areas, and communication facilities.

Because communication in space faces a huge problem, that is, the total communication volume.

The so-called 9.2~9.6G speed per second is actually the speed of a laser to a communication device. What if 10 people are using it at the same time? Or hundreds of people are using it at the same time?

As the number of users increases, the smaller the personal communication speed will be divided under the premise that the total number of communication remains unchanged.

There are 10 people, and the remaining one is about 900M per second.

If there are 100 people, there will be about 90M per second.

1,000 people...

By analogy, the more users, the less communication speeds the individual allocates, and laser communication must be positioned and directional, and users cannot be concentrated in a small area. The communication quality can be imagined.

Starlink plans to launch 42,000 satellites, with a total communication capacity (i.e. bandwidth) of about 400,000 GB per second. If you want to maintain a communication speed of 5MB per second for individual users, the maximum number of users is 80 million.

If you want to maintain a communication speed of 100M per second for individual users, the Starlink communication system can only allow up to four million users to access the Internet at the same time.

What's more, the arrangement of 42,000 satellites in low-Earth orbit communication is simply catastrophic consequence, because these satellites have limited service life and must be replenished frequently. Abandoned satellites will become dense space garbage, making it more difficult for humans to explore outer space.

The Starlink Project is not like a communication system, but more like a weapon system.

The purpose of Tiangong Space Station's experiment in laser communication is to study high-quality laser communications and outer space communications of satellites and spacecraft.

Nie Changfeng and the three laser communication stations on the ground conducted more than 20 minutes of communication, but due to orbital detours, the communication was interrupted.

In the laser communication system in outer space, if you want to save uninterrupted communication, you can only use multi-point arrangements to achieve it.

The laser communication laboratory on the Tiangong Space Station has no other auxiliary communication satellites, and can only conduct communication experiments with the ground during the window period.

After completing this laser communication experiment, Nie Changfeng did not leave, but turned around and entered the rear half of the cabin of the laser communication laboratory.

A high-energy laser transmitter was installed here. He adjusted the direction and locked a piece of space garbage 324 kilometers away through the Beidou satellite and the Gaofen satellite.

It was a piece of abandoned solar panel with a length of 4 meters and a width of about 0.8 meters.

Carefully manipulated the laser, and with the assistance of the positioning system and high-segment satellite, Nie Changfeng pressed the laser emission button.

A high-energy laser that is invisible to the naked eye is emitted from the laser, and the laser emits laser light. The reaction force generated even slightly pushes the Tiangong Space Station, causing the space station to deviate by several meters.

The laser light instantly shone on the abandoned solar panel. Under the laser light, the temperature of the solar panel quickly rose and also fell towards the atmosphere.

[Alarm! Target shifts!]

Nie Changfeng then turned off the laser and observed the movement of the abandoned solar panel.

The solar panels that were originally floating around 307 kilometers of low-Earth orbit began to fall down quickly after being hit by a laser.

After observing for a while, Nie Changfeng activated the laser again to give the solar panel a new acceleration.

After seven consecutive irradiation, the orbital height of this space garbage has dropped to around 157 kilometers.

There is no need to illuminate it again at this time, because the planet's gravity will quickly pull it down the atmosphere and then burn it into the atmosphere.

NASA's space garbage monitoring system also discovered an abnormal situation in this space garbage. Whether it was the sudden heating or the strange acceleration, it all showed that someone was controlling this space garbage.
Chapter completed!