Chapter 268 Theoretical Limits of Satellite Resolution
"Teacher Xu, this is an office specially prepared for you. All relevant information is in the computer and on the bookshelf. You can take a look at it yourself first. If you have any questions later, I will arrange for other experts to discuss with you. When it's time for dinner, I will call you to eat together."
"Okay, Mr. Yu, you go ahead and do your work first."
After Yu Guangsheng came out of Xu You's office, he closed the door.
Suddenly, Xu You felt silence.
Xu You could guess that this was probably an office that Wu Jing had specially prepared for him.
Since Wu Jing was able to learn so much information about Xu You when he was in college.
It is also likely that you know that Xu You has the habit of studying alone.
Such a quiet atmosphere is just right for Xu You to enter a state of deep learning.
Xu You took a quick look at the books on the bookshelf.
There are probably more than a hundred books on the entire bookshelf, many of which are related to satellites.
Xu You picked up a book at random, flipped through the contents, and realized that it was not simple knowledge.
In addition to the books, there are also many printed volumes of materials nearby, which contain more internal information.
There are hundreds of related documents on the computer.
The amount of knowledge is so huge that even an excellent college student in a related major may need several years to learn all of this.
But for Xu You, the time required will be greatly reduced.
At this time, Xu You did not feel pressured by too much information. Instead, he felt very excited and expectant.
Ever since Xu You became a university teacher, he has rarely had the opportunity to devote himself fully to studying.
Sometimes, Xu You feels that studying is more interesting than doing scientific research.
The pleasure brought by learning knowledge and the sense of accomplishment brought by doing scientific research are not quite the same.
The pleasure that learning brings is irreplaceable by anything else.
Xu You carried the books from the bookshelf in piles to the desk.
Entering the deep learning state, Xu You began to learn and conquer knowledge.
A few days passed.
Xu You read through all the information in the room at incredible speed.
After continuous progress day by day, even though Xu You's learning level still remains at level four, his learning efficiency has greatly improved.
Some improvements are accumulated every day rather than being achieved all at once after the learning level is raised.
Of course, after reading all these materials, Xu You still had some questions that he couldn't fully understand, and he needed to communicate with those experts.
Xu You found Yu Guangsheng and explained to him that he had read all the information.
"Teacher Yu, can you help me call a few experts so that I can have a face-to-face discussion with them? I have read all the materials, but there are still some places where I have doubts."
"Teacher Xu, have you finished reading all of them?"
Yu Guangsheng was extremely surprised at what Xu You said.
These materials are almost all the important information of the five academies.
According to Xu You's mission, Xu You only needs to read some information about the satellite.
Even if we finish reading all the satellite data, it will take at least a month.
Yu Guangsheng had heard that Xu You learned very quickly, but he never thought it could be so exaggerated.
"Yes, I have read it all. This information is really valuable. I can't get this knowledge outside."
"Of course, these are all the most internal information. I will call a few experts over now."
After that, Yu Guangsheng called several designers and engineers from the Academy of Aerospace.
Through what he had learned over the past few days, Xu You knew that Yu Guangsheng held a very high status in the Fifth Academy, and other people generally addressed Yu Guangsheng as Mr. Yu.
This shows that only Xu You and Wu Jing have the privilege to call others "teacher".
Xu You didn't know why there was such a difference.
But it seems that Wu Jing's level is much higher than Yu Guangsheng.
Xu You felt that it would be right to do as Wu Jing said.
After face-to-face communication with these experts.
Xu You finally resolved the confusion in his heart one by one.
At this time, Xu You already had some basic ideas about how to improve satellite resolution.
"Let's calculate the resolution limit first."
Because reconnaissance satellites use electromagnetic waves to identify objects.
Therefore, they all have a theoretical resolution limit.
Xu You drew a model diagram of the problem on a piece of draft paper and quickly came up with the relevant formulas.
θmin=1/R=1.22λ/D.
That is, the limiting resolution angle, which is equal to 1.22 times the wavelength divided by the optical aperture.
In this way, the required diameter of the telescope can be calculated based on conditions such as the satellite orbit radius, ground resolution, wavelength of light, and resolution angle.
Theoretically, as long as the diameter is large enough, very high ground resolution can be achieved.
For example, if you want to achieve a resolution of 1mm, it is theoretically possible.
only……
In this case, a telescope with a diameter of about 185 meters would be needed.
It is definitely impossible to send such a terrifying telescope into space based on the current rocket carrying capacity.
Xu You appropriately changed the orbital radius and resolution requirements.
Through calculations, based on our existing rocket carrying capacity, it is theoretically possible to achieve centimeter-level resolution.
Of course, this model calculation is only a very preliminary inference.
There are many, many technologies that need to be considered if we want to truly realize the launch of a satellite.
Including satellite pointing accuracy, satellite stability, multi-lens splicing, diffractive optical films, etc.
Possible problems such as narrow vision and limited ability to distinguish true from false are also things that Xu You must take into consideration.
Because the whole problem was too complicated, Xu You was unable to decide on a specific design plan for the time being.
Before finalizing the design plan, Xu You needs to comprehensively rank various conditions and then clarify the design direction.
Xu You found Ren Wendou, with whom he had communicated before, and asked him some in-depth questions about this satellite.
Ren Wendou is the chief satellite designer of this project. When it comes to satellites, Ren Wendou is the one who knows the most.
"Teacher Ren, I have a few things I want to discuss with you again."
" Teacher , please go ahead."
"For our satellite launch plan this time, as long as we can ensure that the satellite's resolution is sufficient, other issues are secondary, right?"
"You can say that. Because our batch of satellites are also high-resolution satellites. The so-called high-resolution refers to high resolution. This is our ultimate goal."
