Chapter 270 Theoretical Limit of Satellite Resolution
"Teacher Xu, this is an office specially prepared for you. All relevant information is on 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 work with you.
Let’s talk. Wait for dinner time, and I’ll ask you to have dinner with me.”
"Okay, Teacher Yu, you go and do your work first."
After Yu Guangsheng came out of Xu You's office, he closed the door.
Suddenly, Xu You felt a silence.
Xu You could guess that this was probably an office specially prepared by Wu Jing for herself.
Since Wu Jing can learn so much information about Xu You when he was in college.
You may also 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 took out a book at random, opened the contents, and realized that it was not simple knowledge.
In addition to books, there are also many printed volumes of information nearby, which are more internal information.
In computers, there are hundreds of relevant documents.
The entire amount of knowledge is so huge that even an outstanding college student in a related major may take several years to learn all these things.
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 was in a state of great excitement and anticipation.
Ever since Xu You became a university teacher, he has rarely had the opportunity to devote himself wholeheartedly to learning.
Sometimes, Xu You feels that studying is more interesting than doing scientific research.
The pleasure that comes from learning knowledge and the sense of accomplishment that comes from doing scientific research and producing results are not quite the same.
The pleasure brought by learning cannot be replaced by other things.
Xu You carried the books on the bookshelf into piles and put them on the desk.
Turning on 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 an incredible speed.
After continuous improvement day by day, even though Xu You's learning level is still at level four, his learning efficiency has been greatly improved.
Some improvements are accumulated every day, rather than obtained all at once after the learning level is improved.
Of course, after reading all the information, Xu You still has some questions that he cannot fully understand, and he still needs 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 call some experts for me and let me communicate with them face to face? I have read through these materials, but there are still some questions I have."
"Teacher Xu, have you finished reading them all?"
Yu Guangsheng was extremely surprised by what Xu You said.
These materials are almost all the important materials of the five institutes.
According to Xu You's mission, Xu You only needs to read some information about the satellite.
Even if you finish reading the satellite data, it will still take you a month.
Yu Guangsheng had heard that Xu You learned very quickly, but he never imagined that he could learn so fast.
"Yes, I have read them all. This information is really precious. I have no access to this knowledge outside."
"Of course, this is all internal information. Then I will call some experts over now."
After that, Yu Guangsheng called several designers and engineers from the Aerospace Academy over.
Through the understanding over the past few days, Xu You knew that Yu Guangsheng had a very high status in the Fifth Academy, and others would generally call Yu Guangsheng President Yu.
This shows that only Xu You and Wu Jing have the privilege of calling others "teachers".
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's.
Xu You felt that it was right to do as Wu Jing said.
After face-to-face communication with these experts.
Xu You finally solved the confusion in his heart one by one.
At this time, Xu You already had some basic ideas about improving satellite resolution.
"Let's calculate the resolution limit first."
Because reconnaissance satellites use electromagnetic waves to make distinctions.
Therefore, they will all have a theoretical resolution limit.
Xu You drew a model diagram of the problem on a scratch paper and quickly derived the relevant formulas.
θmin=1/R=1.22λ/D.
That is, the ultimate resolution angle is equal to 1.22 times the wavelength divided by the optical aperture.
In this case, the diameter of the required telescope can be calculated based on conditions such as satellite orbit radius, ground resolution, light wavelength, and resolution angle.
Theoretically, as long as the diameter of the telescope 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 is needed.
Such a terrifying telescope is definitely impossible to send into space according to the current rocket carrying capacity.
Xu You appropriately changed the orbit radius and resolution requirements.
Through calculation, according to 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.
If you want to truly realize the launch of satellites, there are many, many technologies that need to be considered.
Including satellite pointing accuracy, satellite stability, multi-lens splicing, diffractive optical films, etc.
Possible problems such as narrow field of vision and limited ability to distinguish truth from falsehood are also things Xu You must take into consideration.
Because the whole problem was too complicated, Xu You had not yet decided on a specific design plan.
Before confirming the design plan, Xu You needs to comprehensively sort various conditions and then clarify the direction of the design.
Xu You found Ren Wendou, whom he had communicated with before, and asked some in-depth questions about this satellite.
Ren Wendou is the chief satellite designer of this project, and he is the one who knows the most about satellites.
"Teacher Ren, I have a few things that I would like to discuss with you again."
"Teacher Xu, please tell me."
"In our satellite launch plan this time, as long as we can ensure that the resolution of the satellite is sufficient, other issues are secondary, right?"
"It can be said that because our batch of satellites are also high-resolution satellites. The so-called high-resolution satellites refer to high resolution. This is our ultimate goal."
Chapter completed!