It is different from the 2023 of later generations.
The Taoyuan Airport of this era was still somewhat primitive and far from as modern as it would be in later generations.
At this moment.
Under the gray sky.
The grass on both sides of the runway swayed with the slight wind, and the ground of the airport was covered with dark gray concrete, with logos and white markings indicating routes engraved on it.
But in stark contrast to this primitiveness, there is another chilling atmosphere.
Next to the runway.
Rows of military aircraft stood there neatly, their fuselages painted green, slightly giving off a sense of coldness and majesty.
Some maintenance personnel wearing work clothes were shuttled through, carefully checking the equipment around the fuselage.
Their meticulous hands fasten every part minutely to ensure that all details are properly handled.
Look further away.
Intersecting towers can be seen everywhere, and equipment such as radar and communications are placed on the ground. It is not difficult to imagine that a war may break out here at any time.
What is also sobering is...
Some anti-aircraft guns and tanks placed on the roadside gave the air another cold and oppressive atmosphere.
It seems that even if you try all your charms, you can't make this place gentle. Instead, it will make this place look more serious and scary.
And among these rows of military aircraft.
There is a square matrix that is a little more special:
It consists of four huge black fuselages. The entire fuselage has a smooth appearance without any trivial decoration, making it simple and elegant.
The black appearance makes people feel a strong sense of oppression, and the huge and thick body shows its powerful strength and physique.
These aircraft do not have the ability to fight in air or drop bombs, but they are one of the most threatening aircraft of this era.
That is, the famous...
Mrs. Dragon, U2 reconnaissance plane!
At this moment.
On the tarmac.
A foreign man with blond hair and blue eyes was holding a document and said to the three fully dressed pilots in front of him:
"...That's about it. Lu, Li, Yang, you should have memorized this mission, right?"
Hear this.
Lu Xiliang, who was the captain of the Black Cat Brigade at the time, nodded and repeated:
"Understood. After taking off, we will cross the strait and fly directly to Longyou Jinta County to survey the situation, and then continue westward to the hinterland of Zhuzhou."
"Every unusual image on the road must be photographed. Don't be stingy with film. The more photos the better."
"Mr. Johnson, don't worry, we promise to complete the mission!"
Seeing Lu Xiliang's serious attitude.
Bruce Johnson, then Strategic Air Command, also nodded:
“Very good.”
a few days ago.
After receiving the telegram from 'Chen Wenliang'...that is, Kong Lu from Jinta County.
The leaders of the logistics headquarters immediately attached great importance to this information and held an emergency meeting.
After all, this is the closest piece of information they have received to the progress of the development of the atomic bomb in recent years.
Of course.
This is also related to the time when U2 has been in service - U2 was only officially shipped to the Black Cats at the beginning of this year.
Therefore, after detailed discussions.
The logistics headquarters made a major decision:
Send three U2s to investigate Jinta County!
To know.
Currently, the entire Black Cat Squadron only has four U2 reconnaissance aircraft.
However, there is nothing inherently wrong with this decision. After all, it was a gas diffusion field explosion:
Various equipment, instruments and materials after the explosion must be transferred to other locations immediately.
Although rabbits are bound to be extremely careful.
But after all, it happened suddenly, and some little chicken feet were bound to be exposed in some places.
In this rare situation...
In terms of logistics, we decided to come to Boda!
It is said that the chairman of Logistics at the time said something very confidently:
"The flight altitude of the U2 reconnaissance aircraft is 22,000 meters, while the MiG-17 and J-5 fighter jets are only 13,000 meters, 22,000 versus 13,000. The advantage is mine, and we can dispatch all of them!"
Therefore, if there is not a U2 that is still undergoing repairs due to serious wing wear.
Then the entire Black Cat Squadron will be sent out today.
As for the candidates to perform the task, the logistics department also selected the best of the three elites:
Lu Xiliang, then squadron commander.
Yang Shiju, then the second captain of the squadron.
And the absolute ace who is known as the number one pilot on the island...
Li Nanping.
After Johnson has finished explaining the relevant matters.
Lu Xiliang looked at Yang Shiju and Li Nanping next to him and said:
"Lao Yang, Nanping, our task this time is very difficult, and there is no communication equipment on U2, so we can only rely on our tacit understanding."
"Remember, if you encounter a fighter on the other side - even an outdated P-51, immediately raise your altitude!"
"Come on, captain, you talk like a motorcycle."
Li Nanping on the side waved his hands indifferently and said with a smile:
"I need you to teach me about this kind of thing. Who can compare to us when it comes to running away?"
Lu Xiliang subconsciously wanted to retort, but after thinking about it, it seemed...
Nothing wrong?
So he slapped Li Nanping on the shoulder with some shamelessness, laughed and cursed:
"You're the only one who talks too much. Let's go and get on the plane!"
More than ten minutes later.
Accompanied by a low roar.
Three U2s flew off the runway one after another.
As the altitude increases.
The landscape recedes rapidly and the ground becomes smaller and smaller.
The traffic and buildings beneath me became as insignificant as small toys.
In the blink of an eye.
The plane flew straight into the clouds.
The clouds at the top are getting thicker and the light is getting brighter.
The scene outside the cabin seems to change one scene every second, with countless seas of clouds blooming outside the cabin to create a beautiful scene.
Look at this scene.
Don't know why.
A strange idea suddenly appeared in Li Nanping's mind:
If I were to ascend to heaven after death, I guess the scene would be similar to this, right?
...........
At the same time as the three U2s were flying towards the mainland.
221 base.
Before Xu Yun even put on his pants, Lao Guo hurriedly pushed him to the original damper tower...that is, outside the area where the weather Doppler radar was located.
At this moment.
Several tents have been erected on the edge of this area and a temporary command center has been built.
When Xu Yun and Lao Guo entered.
Li Jue and many other senior officials have gathered in the entire command center - of course, the number of people is a little smaller than on the day of the previous experiment.
After all, the main attributes of the command center tend to be strategy and technology, and non-professionals will definitely have to screen out some of them.
Anyway, in addition to the command center, you can also watch theater outside the tents.
"Old Sun."
After entering the tent.
Lao Guo immediately found Sun Junren and asked him:
"What's going on with U2? Is there any news?"
Sun Junren had just put down the phone in his hand. He didn't even have time to drink, so he immediately introduced:
"Currently, three U2s have just flown across the strait, and their trajectories are relatively erratic, but our comrades are already following them in J-5s."
"The J-5s are sent out firstly to perform a full set of actions, and secondly to grasp their movement trajectory."
"In this way, no matter which route they take next, we can have relevant information in real time."
Lao Guo nodded slightly.
This time, the organization selected Jinta County as the ‘location’ of the uranium enrichment plant.
In addition to Chen Wenliang, a well-known undercover agent, there is another very important reason, and that is...
The geographical location of Jinta County.
Jinta County is located in the right border of Long, adjacent to Xihai Province.
It happens to be three points on a straight line with the Jinyintan Grassland where Base 221 is located, and the Taoyuan Airport where U2 takes off.
In other words.
Unless U2 has the brains to take a weird triangular route like Taoyuan→Mohe→Jinta.
Otherwise, there are only three general trajectories:
1. Linear type:
Taoyuan → Fujian Province → Gan Province → Xiangchu → Sichuan and Chongqing (or southwestern Shaanxi Province) → Jinta.
2. Southerly arc type:
Taoyuan → Guangdong Province → Bagui → Southeast Yunnan Province → Southwest Sichuan Province → Jinta.
Three, northerly arc type:
Taoyuan → Zhejiang Province → Magic City → Haidai → Jingchu → Jin Province → Fortress on the south of the Yangtze River → Golden Pagoda.
No matter which way you go.
The very end will inevitably pass through Base 221... which is the scope of the Zhuxian Platform.
In addition, the actual distance between Jinta County and the 221 Base is more than 600 kilometers, which is very far apart, so we can calmly ignore it.
Even if something happens to U2.
The 'hate value' will at most be pulled to the Jinta or even the west of Longyou, and will not be involved in the 221 base in the West Sea.
So after a comprehensive discussion.
The superiors decided to choose Jinta County as the place to lure the snake out of its cave.
Then Sun Junren walked to a huge map of the whole country. The territory on the map clearly showed the other side and the Diaoyu Islands.
Sun Junren picked up a pen from the blackboard and drew a circle somewhere near the southeast of Fujian Province:
"According to the news from comrades from the south, the current U2 reconnaissance plane is stranded in the sky over Fuding County, Fujian Province, and seems to be teasing our fighter jets."
"According to usual experience, they will stay for about ten to fifteen minutes."
When Lao Guo heard this, he smiled coldly, and a hint of murderous intent appeared on his usually good-natured face:
"If you want to do this, let them do it. Anyway... this is the last time."
Mentioned earlier.
The U2 reconnaissance aircraft does not have real-time communication equipment, so after the U2 performed its mission, the other side did not know what the pilot did.
The pilot only needs to ensure that the flight mission is close to eight hours and the flight trajectory complies with the preset route.
So after entering the mainland.
Many Black Cat pilots like to tease the rabbit fighter jets in the near sky, which is almost a "Hey, you can't hit me" kind of provocation.
So Lao Guo and the others didn't take it seriously.
The first time is fresh, the second time is familiar, and the second time is just like Lao Guo said, this is the last time.
Since it's the last time.
Then it's okay to let them dance a little longer.
After all, there is still a sense of loss.
And just when Lao Guo and Sun Junren were chatting.
Xu Yun looked around.
I found that although everyone's expressions were serious and their actions had a sense of oppression, they did not show any panic at all.
See this situation.
Xu Yun couldn't help but have a question mark in his heart.
This... isn't quite right?
Then he hesitated for a moment and looked at the nearest Master Qian:
"Um...Director Qian, is it convenient to talk now?"
Qian Wushi was originally looking at a design drawing in front of him. When he heard this, he immediately put down his pen:
"What's wrong, Comrade Han Li?"
"...."
Xu Yun was silent for a moment, made a three sign with his finger, and asked:
"Director Qian, if I heard correctly just now, there should be three U2s coming from the opposite side, right?"
Master Qian nodded:
"That's right."
When Xu Yun saw this, the feeling of disobedience in his heart became stronger and stronger.
I saw him turning his head around again and asked in surprise:
"Then Director Qian, why are you so calm?"
"You know, those are three U2s!"
Master Qian nodded again with a very calm tone:
"I know that the value of the three U2s is still much higher than we expected."
"What the hell I'm talking about is not about value!"
Xu Yun couldn't help but uttered a curse word, and his tone was slightly higher:
"Director Qian, there are three U2s, and we only have four missiles, and we don't have the ability to track them separately!"
"That is to say, unless we are lucky, one or even two U2s may escape back, and then our efforts will be in vain!"
"Oh, you're talking about this."
Qian Wushi raised his eyebrows when he heard this, looked at Xu Yun with a very subtle expression, and said:
"Comrade Han Li, who said our missiles can't split and track?"
Xu Yun's output, which he was about to express his filial piety, suddenly got stuck in his throat, and his entire expression suddenly became stiff:
"...Gah?"
Then Qian Wushi scratched his hair, rummaged around on the table a few times, and quickly took out a manuscript about 0.5 cm thick:
"Here, look at this - by the way, can your hand hold it?"
Xu Yun nodded:
"no problem."
It has been more than a month since he arrived at the base. Although it is still impossible to get down to the ground, it is not difficult to get a few pages of paper.
Then he took the stack of calculation paper from Master Qian and read it carefully.
I just took a few glances.
He suddenly shrank his eyes and suddenly raised his head to look at Master Qian:
"Director Qian, this is..."
Qian Wushi smiled slightly when he saw this, pointed at the calculation paper and explained:
"Yes, this is a temporary solution we optimized a few days ago based on the principle of weather Doppler radar."
"One of the main principles is the meteorological Doppler principle you proposed. Comrade Yu Min and I constructed a Bayesian framework based on the principle."
"That is, when analyzing moving targets, radio waves can be used to describe characteristic parameters and analysis variables."
"The whole calculation process was a little difficult, but luckily we finally succeeded."
"Just because this situation is relatively confidential, I didn't tell you right away - even Lao Guo just found out about it not long ago, so Comrade Han Li, don't mind it too much."
Of course Xu Yun wouldn't mind.
First of all, this kind of project is a highly confidential work, so it is normal not to tell him.
Secondly,...
Today, Xu Yun has no 'space' to mind - his mind is filled with shock and is about to overflow like the trash fish among the readers in his previous life...
to be honest.
In fact, purely from the conclusion.
Qian Wushi's plan is not very special.
Similar principles are not uncommon in later generations. Not to mention intercepting three targets at the same time, it is not difficult to intercept 30 targets separately.
For example, DOI: 10.3969/j.issn.1001-506X.2011.09.04. The principles described in this paper are almost the same as those of Qian Wushi.
To describe it in terms of later generations, the principle is almost like this:
First use Kalman filtering to limit the process noise and measurement noise - this can be achieved through the filtering effect of meteorological Doppler radar. Lin Yu used similar logic when he experimented with the radar effect.
Then, the nonlinear non-Gaussian time-varying system state filtering and parameters are processed, and the optimal Bayesian estimate is approximated by predicting and updating the system probability hypothesis density sampling.
That is to say, the missile target...that is, U2 recognition is used as the object of multi-target filtering, and the motion model is analyzed and derived.
Finally, the multi-objective filtering problem is modeled under the framework of Bayesian random finite set theory, and optimal Bayesian filtering is used to estimate the multi-objective posterior probability density.
Then the first-order moment expansion approximation is used to replace the posterior probability density of multiple targets to achieve the estimation of the number of targets and target states.
Very simple and easy to understand.
Of course.
Considering that some students have stored their brains in other places, here is another explanation in human terms:
Qian Wushi and the others optimized a certain receiving element on the missile and guided the flight of the missile by subdividing the S-band radio to avoid mixed or wrong batches.
but.....
This is technically not difficult to achieve, but computationally there is almost no possibility of success - after all, there are no integrated circuits these days.
Want to do this.
We must break down the various conditions of the aircraft and then calculate the corresponding values!
For example, target A is at a certain altitude, speed, and angle. In this case, what frequency of radio transmission guidance is used, etc.
How were those principles calculated in later generations?
It relies on computers or even supercomputers!
That is hundreds of millions, billions or even billions of computing power per second!
They only need to calculate the corresponding system of equations, then derive the first-order differential equation, and leave the rest to the program.
But what about Qian Wushi and the others now?
I can only rely on written calculations and mental calculations. At most, I can use a hand-operated calculator or the 103 machine in the capital that can perform tens of thousands of calculations per second.
Not an exaggeration.
If someone in later generations told Xu Yun that they could calculate the results in this way, Xu Yun would probably think that the person was either a fool on Zhihu or a fool on Bilibili.
But right now, the other parties are Qian Wushi and Yu Min...
To know.
Even Bayesian filtering to estimate probability density only involves a first-order differential matrix.
This level of difficulty is at least two to three levels different from the partial differential equations Yu Min faced when calculating the hydrogen bomb - after all, there are only four variables: altitude, speed, angle and frequency.
And when Yu Min was able to calculate the results of the relevant partial differential equations, then the calculation of this model seems to be...
Isn’t it that hard to accept?
After all, Yu Min's deeds were not blown out by him, nor were they exaggerated to promote some false news.
Because there is a fact that is placed in front of everyone:
If Yu Min had not calculated the partial differential equation, the hydrogen bomb would not have exploded smoothly.
For example, why couldn’t Asan of later generations develop a hydrogen bomb?
One is the international environmental issue. It is impossible for the five gangsters to let Ah San possess a hydrogen bomb.
The second is theoretical issues - the biggest difficulty is the partial differential equation calculated by Yu Min, and Ah San still cannot calculate the solution.
Think of this.
Xu Yun felt relieved in his heart.
Too.
Rabbits' strategic vision never needs to be doubted.
If you can think of using Jinta County as bait, then the superiors must have considered the possibility of sending multiple U2s from the opposite side.
It seems that I despise these seniors too much...
And just when Xu Yun was feeling emotional.
Didi didi——
The telegraph machine not far away suddenly sounded a rapid printing sound.
See this situation.
The liaison officer immediately removed the telegram.
At least understand it carefully.
After a while.
The somewhat young liaison officer stood up with a bang and said to Lao Guo and others:
"Report! According to the news from comrades from the southeast, the three U2s stopped circling and started heading straight towards Gan Province!"
"If nothing else happens..."
"They should go in a straight line to Jinta County, passing right above our heads!"
........
Note:
There will definitely be a U2 bombing tomorrow, so prepare your monthly tickets.