I send courier to heaven

Chapter 263
At that time, the goal of the Chinese nation is really not to compete with country A on the earth for who is the boss of the world, but to focus on interstellar travel.

"Silver Han travels so darkly that he endures the magpie bridge to return."

As a bridge across the Tianhe River, Magpie Bridge has always had this special meaning in Chinese traditional culture.

In reality, my country actually launched a relay communication satellite named "Magpie Bridge" on May 5. This satellite was specially built for the "dating" between the earth and the moon.

Queqiao is the relay satellite of the Chang'e-2 lunar probe. The relay satellite will run on the halo orbit at the L2018 point of the Earth-Moon gravitational balance point, and provide the Earth-Moon relay for the Chang'e-5 lander and lunar rover. Communication support.Launched on May 21, [-].

2018年4月24日，嫦娥四号中继星命名为“鹊桥”。 5月21日5点28分，中国在西昌卫星发射中心用长征四号丙运载火箭，成功将嫦娥四号任务“鹊桥”号中继星发射升空。6月14日11 时 06 分，成功实施轨道捕获控制，进入环绕距月球约6.5万公里的地月拉格朗日L2点的Halo使命轨道。

The Chang'e-[-] lunar probe is the backup star of Chang'e-[-]. It is planned to land in the Aitken Basin near the South Pole on the side of the moon facing away from the earth.Because the moon's rotation period is the same as the period of its revolution around the earth, it can only always face the earth with the same side.This means that Chang'e-[-], which landed on the back of the moon, is not only separated from the measurement and control center on the earth by a long distance between the earth and the moon, but also communicates through the lunar sphere.However, communication signals cannot penetrate the moon to reach its back, which requires the help of relay satellites to realize data transmission and complete ground measurement and control tasks.

"Magpie Bridge" is equipped with three types of low-frequency radio antennas: umbrella-shaped parabolic antenna, measurement and control antenna and data transmission antenna.Among them, the umbrella-shaped antenna has a diameter of 4.2 meters, which is the largest communication antenna in the history of human deep space exploration.It will point directly to the moon and dock with the Chang'e-[-] probe. It will not only tell the probe the ground measurement and control instructions, but also hear clearly what the probe wants to say to the earth.

"Magpie Bridge" needs to provide relay services, and the relay communication subsystem is the core part.The system has established three links between the ground, the moon and the satellite - the forward link to the moon, the reverse link to the moon and the data transmission link to the ground.These three links will enable two-way communication between "Magpie Bridge" and the Chang'e-[-] probe, as well as two-way communication with the ground.

Queqiao will provide ground-moon relay communication support for the Chang'e-[-] probe, solve the communication problem with the back of the moon, and provide ground-moon relay communication support. observe.

The reason why the Chang'e series of rockets are launched is to enable people to study this "little follower" who has been around the earth for 45 billion years.

This is also related to a puzzling secret of the moon.

What is different from ordinary people's understanding is that the moon actually has two "faces."

Due to being copied and locked by the earth, the moon's rotation period and revolution period are equal, so it can only always face the earth with the same side.

Even in the era of manned spaceflight, due to the obstruction of the moon as a whole, its back has become a restricted area for ground communication.In the past 60 years, humans have launched hundreds of lunar probes.

But except for a few who can barely see the back of the moon, none of them can make a soft landing on the back of the moon, which is why.Rumors about the far side of the moon were once rampant.

Alien bases, lunar homes, these settings are full of imagination.

There will also be a veil of mystery on the back of the moon. Through the Chang'e 3 experiment, our country has mastered the key technology for soft landing on the moon.

Chang'e 4, which is used as a backup, has little meaning in landing. In order to let Chang'e 4 play its residual heat, researchers decided to send Chang'e 4 to the mysterious back of the moon in another way, and want to realize the detection, landing and research of the back of the moon. .It is necessary to transmit the signal there. Since the moon blocks the back, in order to realize the signal forwarding service for Chang'e-[-] and the Yutu lunar rover, there must be a communication satellite as a relay transmission task.

This makes "Magpie Bridge" the first lunar signal relay satellite in human history, and Chang'e-[-] will also become the first probe in human history to set foot on the back of the moon at the end of the year.

After the "Magpie Bridge Satellite" is launched, it will first arrive at the L2 equilibrium point of the contracting Lacrange, eliminating the communication blind spot of the contracting party.

The so-called Lagrangian point, in short, at this point, the "magpie bridge" can always be relatively stationary with the earth and the moon, and can also keep in touch with the earth and the moon at the same time.

The three-body problem mentioned in the famous science fiction novel "The Three-Body Problem" is inextricably linked to this point.

Queqiao will also become the only communication satellite in the world that operates at Lagrange L2 point. By installing the world's largest deep-space satellite antenna on "Queqiao", mankind will first establish the "Earth-Moon-L2 point "Relay communication system.

In addition to providing a communication relay for Chang'e-[-], "Magpie Bridge" will also carry a Dutch-Chinese low-frequency detector to detect low-frequency radio radiation from the early universe. In the future, it can also provide relay signals for other countries' exploration of the back of the moon services.

Chang'e-4, which landed on the moon, in addition to our country's routine missions, will also carry German lunar surface neutron and radiation dose detectors, Swedish neutral atom detectors and other detection equipment for international detection missions. If the Chang'e-40 lunar lander is successful Landing, it will become the first "human" to visit the far side of the moon with scientific purposes in more than [-] billion years.

"If what you said is true, we hope to cooperate with you. We will share our current science and technology with you, and I hope you can share your technology!" The old man from the Ministry of Commerce said with his eyes staring at Lin Tian.

"Okay, of course there is no problem." Li Changsheng said with a smile, "I might as well tell you that I have been to the moon before."

"What? You've been to the moon before?"

The old man stared at Li Changsheng with wide eyes and asked.

"I have evidence here." Li Changsheng threw a stone he had picked up at the gate of the Moon Palace to the old man.

The old man was terrified, this is precious scientific data, and it was thrown away by Lin Tian like this.He carefully kept the stone, looked at Lin Tian seriously and said, "Mr. Lin Tian, ​​if there is no problem. The cooperation between you and me will be more comprehensive in the future."

(End of this chapter)