Shenzhou 18 home, our three astronauts returned safely, they were Ye Guangfu, Li Cong and Li Guangsu, Shenzhou 18 and China Space Station.The staff is ready to accurately find the position of Shenzhou 18.
Seeing this, I believe that many people will be confused. China has Beidou satellite positioning. Why should Shenzhou 18 go home?
1. Different from Shenzhou 18
Shenzhou 18th time home is at night. Although it is different from before, the flight trajectory of Shenzhou 18 is actually similar to the past.After leaving the space station, they fly around the earth for five laps, and then enter the earth. Of course, there are many very complicated operations in it.
For example, the attitude adjustment of Shenzhou 18, the spacecraft fly in different attitudes, and its flight trajectory is completely different.This itself has a certain difficulty.
Especially when the spacecraft passes through the "black barrier zone", it will lose communication contact. This is because the spacecraft rubs with high -speed air at high speed after entering the atmosphere. Knowing how to break through the "black barrier zone" is a worldwide problem. my country will use radar tracking. From this point of view, Chinese technology is leading!
After breaking the "Black Barries Zone", the next journey of Shenzhou 18 will be much smooth, mainly a process of decelerationIn fact, at this time, the landing site of Shenzhou 18 was almost determined.
As for why Shenzhou 18 is late, there are many factors in which it is relatedIt is also necessary to consider meteorological conditions, wind speed, wind direction, and temperature on the landing of Shenzhou 18.
As Chinas navigation system, Beidou satellite has penetrated our liveUsed.
Shenzhou 18 when flying around the earth, a signal provided by Beidou satellite. Once Shenzhou 18 enters the "black barrier area"Even the Beidou satellite has no signal. This is the main reason for the need to search manually.
Then the question comes. After the signal of Shenzhou 18 through the "Black Bar Medal area", the signal will be restored. Isnt it good to re -use the Beidou satellite?The truth is the truth, but there are two factors of this, one of the positions when a Shenzhou 18th fall, and the state of the spacecraft itself.
It is precisely because of this. At this time, it is not enough to have the Beidou satellite, and it requires the cooperation of radar and ground staff.
The most important thing is that before the landing of Shenzhou 18, our search and rescue personnel had begun to act. After landing, rescuers basically arrived at the scene.There is the credit of the Beidou satellite in it. In this way, the landing of Shenzhou 18 is a systematic project!
2. Prepare and guarantee as much as possible
Although the search and rescue location is on the endless Gobi Beach, it seems that there is no difficulty. In fact, our search and rescue team has carried out a lot of exercises and preparations for the early morning of Shenzhou 18.
The ground search and rescue is not just ground vehicles, but also includes air flight search and rescue team, medical care, and medical security in order to ensure the first timeEssence
The biggest difficulty is visibility. In order to solve this problem, China Aerospace specially installed ground lighting systems.
The bright light can ensure not only the search and rescue efficiency, but also provides lighting for the return compartment of Shenzhou 18.
Because Shenzhou 18 returns, everything is to take the safety of astronauts as the first priority.
The low temperature environment of the dark night also puts forward higher requirements for rescue protection, especially the medical area.There is a suitable temperature!
Two round windows are opened on the side wall of Shenzhou 18. You must know that these two windows are not used to appreciate the scenery.To observe the external environment, another window is used to operate optical sights.
So what is the use of optical sighting mirror on Shenzhou 18?Its main role is to observe the ground and drive a spacecraft.
Under normal circumstances, when Shenzhou 18 returns, astronauts do not need to operate the spacecraft in person, because all action trajectories have already been designed.Although it does not need to be operated throughout the process, some key operation confirmation still needs to be done.
For example, the posture of Shenzhou 18, flight trajectory, speed adjustment are completed by the ground command control center, this stockAt that time, our astronauts just stare at the parameter data panel.
Once an emergency is encountered, or if there is a problem with automatic navigation, then Shenzhou 18 needs manual operation.
From the technical perspective, artificial operations must not have automatic operation safety. Even if our astronauts have practiced a lot, their security is not as good as automatic operation.
One of the most critical issues involved here is the control angle control. The return corner of Shenzhou 18 is the most appropriate between 1.5 and 1.7 degrees.If the corner of the return capsule is wrong, there will be a big problem. For example, the return corner of the back cabin is too small, and the spacecraft will "drift water" and enter the atmosphere and be popped out again.
The back cabin corner is too large. Under the influence of air resistance, the return capsule will have overload. The most serious case is the disintegration of the spacecraft.
神舟十八号成功返回，再一次验证了验证了中国航天技术的强大，多个阶段，多种挑战，每一步，每一分，每一秒，Shenzhou 18 is perfectly completed.
From this point of view, the return technology of Chinese spacecraft has gone at the forefront of the world.
So what do you think of this, please leave a message in the comment area and talk about your point!
