Reborn Tech Scholar

Chapter 441 Chang'e-[-] launch
On December 12, the last day of 30, the eyes of the whole country turned to the Xichang Satellite Launch Center, because today, the Chang'e-2018 probe will be launched into the sky by the Long March [-]B carrier rocket at the Xichang Satellite Launch Center.

As early as before, at the press conference, it has been explained to the outside world that the Chang'e-[-] probe will softly land on the back of the moon, which will be a feat of human lunar exploration projects.It is also the final station of the second step in the three steps of "circling, falling, and returning" of the lunar exploration project, which plays a link between the past and the future.

So not only China, but other countries have also set their sights on the Xichang Satellite Launch Center.The difficulty of the probe's soft landing on the back of the moon is much greater than the technical difficulty of soft landing on the front of the moon.It is absolutely not an exaggeration to say that the difficulty has increased by two or three times, three or four times.

Once Huaxia really successfully realizes the soft landing of the Chang'e-[-] probe from the back of the moon, it means that Huaxia has the ability to carry people to the moon at any time.

"Academician Qin, I have to trouble you to come here for a while!" Academician Ouyang called Qin Yuanqing.

Qin Yuanqing didn't refuse either, and responded straight away: "It's nothing, everyone is serving the country!"

An hour later, a special car came to pick up Qin Yuanqing. This car looked very low-key, but it was a modified car, and the glass of the car was bulletproof glass.

Not long after, Qin Yuanqing came to the headquarters building of the National Space Administration, which is located on Fucheng Road, only 10 kilometers away from Shuimu University.

In Beijing, in addition to the National Space Administration, there are also the National Space Administration's Earth Observation and Data Center, Space Debris Monitoring and Application Center, and Aerospace Remote Sensing Demonstration Center, which connect the launch center with various scientific research ships and scientific research stations.

Arriving at the headquarters building of the National Space Administration, after a rigorous inspection, Qin Yuanqing came to the ground command center of the lunar exploration program.

When Qin Yuanqing walked into the command center, there were already many people here, all of them were staring at the big screen in front of them. In the entire command center, there were at least a hundred staff members, who were connected to the whole world through the computer and stared at them all the time.

After all, the launch of the Chang'e-[-] probe requires another detailed inspection, meteorological observations, and various testing stations to detect the flight trajectory at any time for control.

Unlike previous probes that needed to fly for several days to gradually complete the earth-moon transfer journey, this time Chang'e-[-] will complete this feat after flying several times around the earth.

In the command center, Qin Yuanqing shook hands with the main leaders, such as Wu Weiren, the chief designer of the China Lunar Exploration Project and academician of the China Academy of Engineering, Hao Rongwei, the chief commander of the Chang'e [-] probe system, and the chief aerospace commander!
Then Qin Yuanqing also stared at the big screen, and he could clearly see all the pictures on the big screen.There are not only the Long March [-]B carrier rocket standing on the launch pad and ready to be used at any time, but also the Chang'e [-] probe, as well as a bunch of complicated data.

"Weather No. 1, report the current situation!" Someone in the command center asked about the weather situation.

Then the front has reported the latest situation: "Reporting to the capital, the current wind is 31 knots, and we have observed signs that the wind has weakened to less than seven knots [-] kilometers away. It is estimated that after [-] minutes, the wind over the launch area will drop, which meets the launch conditions. .”

"The monitoring and control station reports the situation!"

"The monitoring station reports that the rocket is normal, the fuel cycle system is normal, and the launcher is ready to hit at any time!"

As the process is filtered over and over again, the countdown begins.Everyone raised their attention to the highest level, always paying attention to the data monitored by all aspects, and controlling the situation of all aspects.

When the countdown entered 5 minutes before the preparations, the weather conditions just entered the best launch conditions. At the same time, the situation of the launch center was constantly reported to the command center in Beijing.Qin Yuanqing couldn't help admiring secretly, this aerospace project is really a high-precision project, the rigor has penetrated into everyone's bones, meticulously, no wonder Huaxia can make achievements that attract the attention of the world with a small budget.

"1 minute ready! Countdown. 50! 40!."

When the countdown sounds "5432"

There was one second left in the countdown, and then 1 sounded, followed by the command to 'ignite', the atmosphere was tense to the limit at this moment, the air seemed to freeze at this second, and suddenly exploded at the next second.

The launch tower was instantly surrounded by thick white smoke, and dazzling fireballs gushed out from the bottom of the rocket and rushed into the sky.In just one breath, the whole world trembled violently. Qin Yuanqing could feel the atmosphere and powerful shock even through the screen and thousands of miles away.

"Boom~~Boom~~"

The thick smoke rose hundreds of meters high, so that the entire Long March [-]B launch vehicle was covered.In front of this earth-shattering shocking scene, any creature will become extremely vulnerable.

I saw a huge rocket rising from the ground, shooting from the tail like a white flame and sharp sword, rushing straight into the sky like a mountain roaring like a tsunami.

The speed of sound seems to be very fast, but in fact, for the rocket, the speed of sound has been exceeded in the blink of an eye. After all, the minimum initial speed for an object to fly around the earth in a circular motion must reach the first cosmic speed, and the first cosmic speed has reached 7.9km/s, which is more than 23 times the speed of sound!

The shape of the Earth-Moon transfer orbit is conical splicing, the perigee is about 10.8km/s, and the near-Earth orbit is 7.8km/s.If you want to go from the earth to the moon, there is only one orbit with the smallest energy efficiency. Only by running along this orbit perfectly can you save more fuel and use it to maintain the orbital height during lunar exploration.

The more deviation, the more fuel will be used.

Qin Yuanqing has already calculated everything from the ground to the earth orbit, the earth-moon migration orbit, the lunar orbit, and the lunar orbit to the landing trajectory, and the model is also based on this.

So soon the various monitoring stations will continue to collect data and smoothly enter the predetermined orbit, and after the orbit around the earth is continuously accelerated, it will enter the migration orbit, and then migrate until it is about to reach the orbit of the moon around the moon. It will continue to decelerate until the speed reaches the predetermined orbit around the moon.After completing this step, it is time to move around the moon until it falls!

Any of these steps, if something goes wrong, it will basically fail.

As he entered the scheduled orbit around the earth, which represented the complete success of the first stage, Qin Yuanqing did not rest, but paid attention to the flight data at any time, and constantly reviewed the flight data. Others could cheer and relax, but he could not relax because This is not only about the Chang'e-[-] probe, but also related to China's manned moon landing project in the future.

Otherwise, according to the way China's probes explored the moon in the past, it would take several days to go around the earth, and several days to migrate from the earth to the moon, and it would take even longer to land on the moon.

Unknowingly, the speed of the spacecraft has reached the speed requirement of the earth-moon migration, and then began to migrate along the originally set earth-moon orbit.

The earth-moon migration first accelerates away from the earth, but when it reaches a certain position, it has to slow down so that the spacecraft can be captured by the moon.

After entering the earth-moon migration orbit, Qin Yuanqing can also relax a little and go to sleep.

On this day, the spacecraft finally entered the near-month braking phase.

In this stage, simply speaking, the directional thrust of the engine is used to decelerate the spacecraft.Then the spacecraft decelerated to a certain value is pushed into a lunar orbit with a perilunar point of 100 kilometers.After that, the spacecraft will fly around the moon in this orbit around the moon.

"Track correction!" The commander-in-chief began to say in a deep voice.

"The third orbit correction is over, and the error is 0.00012 degrees!" The monitoring personnel on the side reported the data.

This error is within the tolerance range.

With the experience of the previous three times, plus the deployment of monitoring stations before this launch, the use of Beidou navigation, and the positioning and command of satellites orbiting the moon, the accuracy and technological content are actually far superior to those of Chang'e-[-].

Including the time, it also reduced the time by four days!

Although it is only four days, it can actually reduce a lot of fuel, and more things can be done later.

"Start slowing down!"

As the command was issued, the spacecraft immediately began to use the engine to decelerate.On the entire big screen, the brakes of the last month began.

The whole process was carried out rigorously according to the data and model provided by Qin Yuanqing. The minutes and seconds, the engine with high thrust, and the angle of thrust were all set early on, and there was no difference.

The speed of the Chang'e-100 probe continued to decrease. When it was captured by the moon, it was just [-] kilometers away from the moon, and it immediately moved around the moon along this preset orbit around the moon.

This set is actually not a circular motion, but an elliptical motion. The perilunary point is 100 kilometers, and the apolunar point is 400 kilometers in orbit around the moon.

Cheers erupted in the entire ground command center.

Originally, Chang'e-[-] was the backup probe of Chang'e-[-]. If all the operations of Chang'e-[-] were copied, the only bright spot would be landing on the back of the moon.But this time, it uses a very different orbit from Chang'e-[-].

Although on the map, the difference was small at the beginning, but the difference continued to increase, and the final result was that the error was very considerable.

It not only saves time, but also saves fuel, and also accumulates richer experience for future lunar exploration projects, which is much more important than Chang'e [-] itself.

Although the moon is only 38.4 kilometers away from the earth and is a satellite of the earth, this distance is still so far away for humans.

As a result, the right to send probes to the moon is currently only in the hands of the United States, Russia, and China, and other countries have undoubtedly failed on their own.

Seeing the successful completion of the second stage, Qin Yuanqing had a smile on his face, and everything went according to his settings.

After completing this stage, Qin Yuanqing temporarily left, because from orbiting the moon to falling the moon, it takes a total of 10 days to orbit the moon, and it will enter this link after 10 days.

Because Chang'e-10 will orbit the moon for [-] days to conduct further exploration of the moon, because this orbit around the moon is different from the previous three orbits.

(End of this chapter)