Chapter 1397: Aerospace experts

For Qin Guan, his life has always been busy.
After returning to the capital, after only one day at home, Qin Guan came to the Ministry of Aerospace the next day.
Major Yang's report has been officially handed in, and the superiors are very concerned. Now, Qin Guan needs to coordinate with the Ministry of Space and Space. Here, Qin Guan finally met a large number of space experts.
"Mr. Qin, everyone has long been looking forward to seeing you." Most of the experts in the aerospace system present are not young, and the years have left traces on their faces. They were poor and white. , Self-reliance, hard work, and achieved zero breakthroughs one by one.
Now, when they know that Eagle Nation has launched the Star Wars plan, they are also excited. In this way, they will definitely play a more powerful role in their field.
Sure enough, the country has to formulate a space plan tit-for-tat. Although the scale of this plan is not large, and, unlike the Eagle Country’s plan, there are no space weapons like science fiction, but the required investment will also be It is an astronomical number!
They are very excited.
"Hello, Mr. Sun." Qin Guan shook hands with everyone in turn: "I wanted to see you before, and I have never had a chance."
Sun Lao, one of the pioneers of Han's artificial satellite technology and deep space exploration technology, has been engaged in aerospace work for 60 years and has presided over the development of 45 satellites.
The original Dongfanghong satellite was Sun Lao’s masterpiece, but now, Qin Guan’s first key project is the satellite navigation system, which is of course Sun Lao’s chief engineer.
Qin Guan had never seen them before, but he shook hands with everyone, and at the same time he was able to call out their names, which seemed even more cordial. In fact, Qin Guan certainly relied on his mental point scanning system. That helped.
These old experts are all famous!
"Mr Qin, regarding the satellite navigation system, after we received the arrangement from the superior, we conducted a preliminary demonstration. The result of the demonstration is that this project is very difficult to launch, far beyond our own current situation. There is a level."
The satellite navigation system is not simple, even in the West, it has come a long way and has been continuously developed. It took more than 20 years for the people of Eagle Country to develop, but what about their own? Without any technical reserves, it is absolutely impossible to develop them all at once.
The era of satellite deployment has passed. Satellites are innocent. All fronts are deploying satellites. Those people who actually deploy satellites are actually shrinking.
Of course, Qin Guan knew that this project was not easy. If everyone could do it easily, then they would not have tried to cooperate with Europa at the beginning because they knew that their technology was insufficient.
The results of it? Cooperation is impossible, so I immerse myself in research, and this research is also gradual. The first thing to do is to locate the binary satellite with low difficulty.
The principle of binary star positioning was first proposed by Eagle Country scientists in 1982.
Compared with GPS, which has dozens of satellites at every turn, dual-star positioning can be done with only two satellites in geostationary orbit. For insurance, a backup satellite can also be added. Its principle is also very simple. The known coordinates of the orbiting satellites are the center of the circle, and each takes the measured distance from the satellite to the user terminal as the radius to form two spheres, and the user terminal will be located on the arc of the intersection of the two spheres.
However, the user cannot calculate it by himself. The ground center station must be equipped with an electronic elevation map to provide a non-uniform spherical surface with the center of the sphere as the center of the sphere and the height from the center of the sphere to the surface of the earth as the radius. The user's position can be obtained by mathematically solving the intersection of the arc and the surface of the earth.
That is to say, this kind of positioning is very simple, but compared with GPS, it is two-way and requires a workstation on the ground. With GPS, as long as there is a satellite above the head to provide time information, it can be calculated by itself, without external s help.
"If we want to proceed step by step, then let's do a binary positioning first, how about?"
Based on the current level, if you want to break through the direction Qin Guan said, for the sake of safety, it is better to establish a double star positioning first.
This is also a plan that they discussed and decided after a few days of meetings. It is gradual and it is impossible to reach the world's advanced level all at once.
Qin Guan shook his head: "This kind of positioning accuracy is not high enough, and it also needs to transmit signals, which is not conducive to concealment, and it can only be regional navigation, so it is not suitable for our current needs."
The advantage of dual-satellite navigation is that a system for regional navigation and positioning can be built at a lower cost and in a shorter time.
However, compared with the real global positioning system, it has many defects. The synchronous satellite orbit is destined to be unable to navigate high-latitude targets, nor can it navigate the other side of the earth. It is destined to be a regional navigation positioning system.
The progress is not high enough, it is about 10 meters. You must know that the positioning accuracy of the GPS signal can reach the meter level. Bombs that use this kind of navigation will never enter through the right window if they fly from the left window. It is quite sci-fi .
The biggest disadvantage is that it has to transmit signals. In the military, once it transmits signals, it means its own exposure. Although it is for the benefit of the world, it is certain that it is destined to be a military system in the first place. It, a low-cost joint attack ammunition, this precision-guided weapon can be widely used.
"However, we don't have such high technology. If we develop directly to the global positioning system, then technically, it will be quite risky." Sun Lao said.
"Yeah, if we don't say anything else, just say that our satellites require high-precision atomic clocks, and we can't do it," said another expert.
For the accuracy of navigation, the most critical thing is the time signal. This time signal can only be provided by the most accurate atomic clock. Its accuracy can reach an error of 1 second every 20 million years. The slightest error is thousands of miles away, the more accurate the time. , The higher the positioning accuracy.
Why did you go to Europe for cooperation? It is because Western countries monopolize the technology of spaceborne atomic clocks and impose a policy of blockade and embargo on our country. Without this technology, navigation would be impossible to talk about.
Later, domestic self-reliance, hard work, and finally succeeded in mastering key technologies, and even succeeded in overtaking in some aspects. When the 17th Beidou-3 networking satellite was launched, it was the most powerful, the most powerful, and the most powerful in the Beidou-3 system. The largest and longest-lived satellite. Moreover, a leading generation of rubidium atomic clock is carried on this satellite, making this satellite the time reference satellite of the entire Beidou system, and its positioning accuracy has been increased by 1 to 2 times.
"If there is a reference?" Qin Guan asked Sun Lao.