A communication satellite is a special kind of satellite used to transmit signals. The communication satellite is one of the earliest and most widely used satellites in the world.

As a radio communication relay station. The communication satellite is like an international messenger, collecting various "letters" from the ground, and then "delivering" them to users in another place.

If the satellite can be relatively stationary on the ground, it will greatly simplify the use of ground users. Therefore, most satellites are geostationary satellites.

At an altitude of 36,000 kilometers, it has a particularly large coverage area, and one satellite can be responsible for communication on 1/3 of the earth's surface. If three communications satellites are evenly placed on the geostationary orbit, global communications can be achieved excluding the north and south poles.

When a satellite receives a weak radio signal from a ground station, it will automatically turn it into a high-power signal, and then send it to another ground station, or to another communication satellite, and then send it to the earth. On the ground station on one side, in this way, we received a signal from a long distance.

However, the technical difficulty of launching a geostationary satellite is quite large. Up to now, Han has no qualified communication satellites. Therefore, Han has to lease satellites from other countries when needed.

This launch is also imperative.

Now, in the country of Han, the launch of satellites is in full swing.

Yuecheng Satellite Launch Center, this is a newly built satellite launch site in Han, this time, it is its first launch.

Compared with the previous launch site, the latitude is low, the altitude is high, the launch angle is good, and the distance between ground and air is short.

The lower the latitude, the closer to the equator, which can not only make full use of the centrifugal force of the earth's rotation, but also shorten the distance from the ground to the satellite orbit, thereby increasing the effective load of the rocket.

At the same time, the canyon here has good terrain and solid geological structure, which is conducive to the overall layout of the launch site.

In terms of climate, there are many sunny and good weather, which is one of the regions with the smallest climate change in the country. There are as many as 320 days of sunshine and almost no foggy days. The test cycle and allowable launch time are relatively long.

In short, the latitude is low, the altitude is high, there are few clouds, no pollution, and the air is transparent. Now, a modern high-tech satellite launch center has been established, and at the same time, it is the only space base for launching geostationary satellites.

It can be said that the space base here was established to better launch geosynchronous satellites. At the same time, Qin Guan also proposed.

In terms of aerospace, we must also take the path of opening up to the outside world and undertake satellite launch missions to the outside world. Aerospace engineering can also be beneficial.

Aerospace has always been associated with the military. The satellite launch base in the past had too many military secrets. Once the aerospace base here is established, it will be opened to the outside world to undertake foreign satellite launch missions.

Now, on the launch pad outside, a rocket has stood up.

At present, the main carrier rocket launched in China is the Long March 2, and the Long March 2 is developed on the basis of the Dongfeng 5. The current Long March 3 is a third stage developed on the basis of the Long March 2. rocket.

To put it simply, its first and second-stage engines use the first and second-stage engines of the Long March 2C, and the third-stage is independently developed and uses the world's most advanced liquid hydrogen/liquid oxygen engine. The rocket has a total length of 44.86 meters and a core stage with a maximum diameter of 3.35 meters. It can send 1,600 kilograms of payload directly into the geosynchronous transfer orbit.

Now it is its first test flight.

Time slowly passed. When the night came, it finally entered the countdown. The launch hall was silent. As the launch command came, hot flames emerged from the bottom of the rocket, and the whole rocket began to slowly climb and leave. The launch pad disappeared from everyone’s sight.

The successful launch has nothing to do with the satellite launch base. What is needed now is measurement and control.

The entire measurement and control task is carried out by Haojing. In Haojing, there is a special satellite measurement and control field.

Although you can't see the vigorous launch scene, nor the splendid and magnificent lively landscape, thousands of instructions and massive data information from all directions are converging and running in silence. It is full of excitement and excitement. Tension and anxiety are hidden again.

In the past, the measurement and control center was mainly used to measure and control the returning satellites. To successfully bring the satellite back to the ground, the measurement and control center was inseparable.

Now, if they want satellites to enter orbit accurately, their mission is also very important.

Since the first artificial satellite of Han State was launched into the sky in 1970, all the satellites launched by Han State, its tracking and observation, remote measurement and remote control, operation management, information exchange, data processing and attitude control, etc. tasks are all undertaken by the center. In the mission of the returnable satellite, with valuable professionalism and superb measurement and control technology, the recovery success rate of the returnable satellite reached 100%.

Now, they must not fail!

At this time, on the ocean, the three maritime survey ships are also working at full capacity, and the antenna of Yuanwang-1 is aimed at the space above the head to capture the incoming satellite at any time.

The 10,000-ton survey ship has opened the fin stabilizer, and the antenna on the top is not moving, capturing satellites in space.

As long as you have studied the knowledge of artificial satellites, you will know that there are three orbits, a near-Earth circular orbit, a large elliptical orbit, and a great circular orbit for a synchronous satellite.

At this time, Qin Guan came to Yuanwang-1, and he listened to the people on the side introducing the launch knowledge of synchronous satellites.

I was familiar with it last time. Colonel Chen is in charge of the entire measurement and control project. At this time, the satellite has just flown overhead. "The attitude is normal, and it's still in a large elliptical orbit." Colonel Chen said: "The most important step for us to launch a synchronous satellite is the ignition in the air."

Through continuous battles day and night, the measurement and control system accurately measured the satellites in the sky. At the same time, through thousands of commands sent to the satellites, the satellite's orbit, satellite attitude, and satellite rotation speed were repeatedly controlled and controlled. Adjustment, thus adjusting the satellite to the best posture waiting for ignition according to human will.

The satellite is already in an elliptical orbit. This is also called a transfer orbit. In this orbit, it must be fired again.

The apogee is thirty-six thousand and it has reached the synchronous orbit, but the perigee is only a few thousand kilometers, and it must be fired at the apogee so that it can enter the great circular orbit.

This ignition is very risky. If the “ignition” command on the ground cannot be issued, or the engine on the satellite does not ignite after the command is issued, the satellite will not be able to reach a quasi-synchronous orbit with a height of 36,000 kilometers, but only in the large Continue to "wander" on the elliptical orbit until it falls and crashes.

In the launch of geostationary satellites, many satellites ultimately failed in this step.

"Who will send this instruction?" Qin Guan asked.

"It's us Yuanwang One." Colonel Chen said.