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Chapter 571: U2 fell! ! ! ! (middle)

Chapter 571 U2 Falls! ! (middle)

Turn back the time slightly by an hour.

Taoyuan Airport.

Different from the later 2023.

Taoyuan Airport in this era is still somewhat primitive, far from being as modern as later generations.

Right now.

Under the gray sky.

The wild grass across both sides of the runway swayed with the slight wind, and the ground of the airport was covered with dark gray concrete, with signs and white markings indicating the route engraved on it.

But in stark contrast to this primitive, there is another chilling atmosphere.

Beside the runway.

Rows of military aircraft stood there neatly, the fuselages were painted green, revealing a slight sense of coldness and majesty.

Some maintenance personnel in overalls are shuttling through, carefully checking the equipment around the fuselage.

Their meticulous hands snap every part to ensure that all the details are properly handled.

Zoom out a little further.

Intersecting towers can be seen everywhere, and equipment such as radar and communication are placed on the ground. It is not difficult to imagine that war may break out here at any time.

It is also refreshing.

Some anti-aircraft guns and tanks placed by the roadside filled the air with another cold and oppressive atmosphere.

As if, with all your charm, you can't soften the place, but make it more serious and scary.

And in this row of military aircraft.

There is a square matrix that is a bit more special:

It consists of four huge black fuselages, the entire fuselage has a smooth appearance, without any trivial decorations, simple and atmospheric.

The black shape 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 or drop bombs, but it is one of the most threatening aircraft of this era.

is the famous

Madam Jiaolong, U2 reconnaissance plane!

Right now.

On the tarmac.

A blond foreign man 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 written down all the missions this time, right?"

Hear this statement.

Lu Xiliang, then captain of the Black Cat Brigade, nodded and repeated:

"Understood, after taking off, cross the strait, fly directly to Jinta County, Longyou to investigate the situation, and then continue westward to the hinterland of Zhuzhou."

"All abnormal images on the road must be taken. Don't begrudge the film. The more photos, the better."

"Mr. Johnson, don't worry, we promise to complete the task!"

Seeing that Lu Xiliang's attitude is so serious.

Bruce Johnson, who was then at the Strategic Air Force 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 called an emergency meeting.

After all, this is the closest piece of information they have obtained to the development progress of the atomic bomb in recent years.

Of course.

This is also related to the time of U2's service - U2 was officially shipped to the Black Cat Team at the beginning of this year.

Therefore, after detailed discussions.

The logistics headquarters has made a major decision:

Sent three U2s to investigate Jinta County!

To know.

Currently, the entire Black Cat Squadron has only four U2 reconnaissance planes.

But this decision is not really a problem in essence, after all, it is a gas diffusion field explosion:

Various equipment, instruments and materials after the explosion must be transported to other locations immediately.

Although rabbits are bound to be extremely careful.

But after all, it happened suddenly, and there must be some chicken feet exposed in some places.

In this rare situation.

In terms of logistics, I decided to come to Boda!

It is said that the chairman of the logistics company at the time said a word very firmly:

"The flying altitude of the U2 reconnaissance plane is 22,000 meters, and the MiG-17 and J-5 fighter jets are only 13,000 meters, 22,000 vs. 13,000. I have the advantage, and I can dispatch all of them!"

So if it weren't for a U2 that was still under maintenance due to severe wing wear.

Then the ones dispatched today will be the entire property of the Black Cat Squadron.

As for the candidates for the task, the logistics aspect also selected the elite of the three elites:

Lu Xiliang, the captain of the squadron at the time.

Yang Shiju, then the second captain of the squadron.

and the absolute trump card 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 beside him again, and said:

"Old 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 opposite side—even if it is an old-fashioned P-51, immediately give me an altitude boost!"

"Come on, Captain, you're very smart with your words."

Li Nanping on the side waved his hands indifferently, and said with a smile:

"You need to teach me this kind of thing. Who can compare to us when it comes to running around?"

Lu Xiliang subconsciously wanted to refute, but after thinking about it, it seemed that

Nothing wrong?

So he patted Li Nanping on the shoulder with some embarrassment, and scolded with a smile:

"You're the one who talks too much, go, 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 height rises.

The landscape recedes rapidly, and the ground becomes smaller and smaller.

The traffic and buildings below him became insignificant like little toys.

In the blink of an eye.

The plane shot 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 be a scene every second, and the countless sea of clouds blooms a beautiful scene outside the cabin.

Look at the scene.

I don't know why.

In Li Nanping's mind, a strange thought suddenly popped up:

If he died and ascended to heaven, the picture would probably be similar to this, right?

And just as the three U2s were flying to the mainland.

221 base.

Xu Yun, who hadn’t even put on his pants, was rushed by Lao Guo to the original damper tower, which is outside the area where the weather Doppler radar was located.

Right now.

Several tents have been set up on the edge of this area, and a temporary command center has been built.

When Xu Yun and Lao Guo entered.

The entire command center has gathered Li Jue and many other high-level officials—of course, the number of people is a little less than that of the previous experiment day.

After all, the main attributes of the command center are biased towards strategy and technology, and non-professionals must screen out some of them.

Anyway, apart from the command center and tents, you can also watch theaters.

"Old grandson."

After entering the tent.

Old Guo immediately found Sun Junren and asked him:

"How's the situation with U2? Any news?"

Sun Junren had just put down the phone at this time, and he didn't even have time to drink, so he immediately introduced:

"At present, the three U2s have just flown across the strait, and their trajectories are relatively erratic, but our comrades are already driving the J-5 to follow them."

"The J-5 is sent out to play a full set, and secondly, to grasp their action trajectory."

"In this way, no matter which route they plan to take next, we can have relevant information in real time."

Old Guo then nodded slightly.

The organization chose Jinta County as the 'location' of the uranium enrichment plant.

In addition to Chen Wenliang being an undercover undercover agent, there is another very important reason, that is.

Geographical location of Jinta County.

Jinta County is located in the frontier of Longyou, close to Xihai Province.

Between it and the Jinyintan Grassland where the 221 base is located, and the Taoyuan Airport where U2 takes off, it happens to belong to three points on a straight line.

In other words.

Unless U2’s mind is drawn to the wonderful triangle route of Taoyuan→Mohe→Jinta.

Otherwise, there are only three general trajectories:

1. Linear type:

Taoyuan→Fujian Province→Jiangxi Province→Xiangchu→Sichuan-Chongqing (or southwestern Shaanxi Province)→Golden Pagoda.

Second, southerly arc type:

Taoyuan→Guangdong Province→Bagui→Southeastern Yunnan Province→Southwestern Sichuan Province→Gold Pagoda.

Three, northerly arc type:

Taoyuan→Zhejiang Province→Modu→Haidai→Jingchu→Jin Province→Caishangjiangnan→Gold Pagoda.

And no matter what kind of move.

Among them, the most end must pass through the 221 base, which is the range of Zhuxian platform.

In addition, the actual distance between Jinta County and Base 221 is more than 600 kilometers, which is far away, so we can calmly ignore it.

Even if something happened to U2.

The 'hatred value' can at most be pulled to Jinta or even the west of Longyou, and will not involve the 221 base in Xihai.

So after a comprehensive discussion.

The higher-ups decided to choose Jinta County as the place to lure the snake out of the cave.

Then Sun Junren walked to a huge national map, and the territory on the map clearly showed the opposite shore 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 in the south, the current U2 reconnaissance plane is stranded over Fuding County, Fujian Province, and it seems to be teasing our fighter jets."

"According to usual experience, they will stay for about ten to fifteen minutes."

Old Guo smiled coldly when he heard the words, and a murderous look appeared on his usually good-natured face:

"Let them do what they want, anyway. This is the last time."

Mentioned earlier.

The U2 reconnaissance plane does not have real-time communication equipment, so after the U2 mission, the other side does 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 conforms to the preset route.

So after entering the mainland.

Many black cat pilots like to tease the rabbit fighter jets in the near air, which is almost the kind of provocation of "Hey, you can't hit me".

So Lao Guo and the others didn't care about it.

The first time is a freshman, the second time is an acquaintance, and the second time is just like what Lao Guo said, this is the last time.

Since it is the last time.

It's okay to let them dance a little longer.

After all, there is still a sense of loss.

While Lao Guo was chatting with Sun Junren.

Xu Yun looked around.

It was found that although the expressions of the people were serious, and their actions carried a sense of oppression, they did not appear panicked at all.

See this scenario.

Xu Yun couldn't help but a question mark popped up in his heart.

This. Not quite right?

Then he hesitated for a moment, and looked at the nearest Fifth Master Qian:

"That. Director Qian, is it convenient to talk now?"

Fifth Master Qian was originally looking at a design drawing in front of him, but immediately put down his pen when he heard this:

"What's the matter, Comrade Han Li?"

“.”

Xu Yun was silent for a moment, made a three-point gesture with his fingers, and asked:

"Director Qian, if I heard correctly just now, there should be three U2s coming from the opposite side, right?"

Fifth Master Qian nodded:

"Exactly."

Seeing this, Xu Yun's sense of disobedience grew stronger and stronger.

I saw him turn his head around again, and asked in surprise:

"Then Director Qian, why are you so calm?"

"You know, that's three U2s!"

Fifth Master Qian nodded again, with a very calm tone:

"I know, three U2s, the value is still much higher than we expected."

"What I tmd said is not a question of value!"

Xu Yun couldn't help but uttered a swear word, and his tone raised a lot:

"Director Qian, there are three U2s, we only have four missiles, and we don't have the ability to track them separately!"

"That is to say, unless one is lucky, one or even two U2s may flee back, and our efforts will be in vain by then!"

"Oh, you said this."

Fifth Master Qian frowned upon hearing this, looked at Xu Yun with a subtle expression, and said:

"Comrade Han Li, who said that our missiles can't do split tracking?"

Xu Yun's output that was about to roar suddenly got stuck in his throat, and his expression became stiff in an instant:

". Ga?"

Then Fifth Master Qian scratched his hair, rummaged through the table a few times, and quickly took out a manuscript about 0.5 cm thick:

"Here, take a look at this—by the way, can you 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 go to the ground, it is not difficult to get a few pages of paper.

Then he took the stack of calculation paper from Fifth Master Qian, and looked at it seriously.

As a result, I just took a few glances.

He suddenly shrank his pupils, and suddenly raised his head to look at Fifth Master Qian:

"Director Qian, this is."

Fifth Master Qian smiled slightly when he saw this, pointed to the paper and explained:

"That's right, this is a temporary plan 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 have constructed a Bayesian framework based on the principle.”

"That is, when analyzing a moving target, the characteristic parameters and analysis variables can be described through radio waves."

"The whole calculation process was a little difficult, but luckily we succeeded in the calculation in the end."

"It's just because this situation is relatively confidential, so I didn't tell you the first time - even Lao Guo just knew about it not long ago, so Comrade Han Li, don't mind too much."

Of course Xu Yun wouldn't mind.

This kind of project is a highly confidential job, so it is normal not to tell him.

Secondly, it is

Nowadays, Xu Yun doesn't have any 'space' to mind—his mind is completely filled with shock at this moment, like the miscellaneous fish in the readership in his previous life, which is about to overflow

to be honest.

In fact, it is purely from the conclusion.

The fifth division Qian's plan is not very special.

Similar principles in later generations are not uncommon. Let alone 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 principle described in this paper is almost the same as that of Qian Wushi.

Described in the terms of later generations, the principle is almost like this:

First use the Kalman filter to limit the process noise and measurement noise—this can be achieved through the filtering effect of the meteorological Doppler radar. It was a similar logic when Lin Yu experimented with the radar effect.

Next deals with nonlinear non-Gaussian time-varying system state filtering and parameters, approximating optimal Bayesian estimation by predicting and updating samples from the probability hypothesis density of the system.

That is, the missile target 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 stochastic finite set theory, and the optimal Bayesian filtering is used to estimate the multi-objective posterior probability density.

Then use the first-order moment expansion to approximate the posterior probability density of multiple targets to realize the estimation of the target number and target state.

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 Fifth Division 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 batches or wrong batches.

but

This is not difficult to do technically, but there is almost no possibility of success in calculations—after all, there are no integrated circuits these days.

want to make it happen.

It is necessary to list all the conditions of the aircraft, and then calculate the corresponding values!

For example, what is the height of target A, what is the speed, what is the angle, how many frequencies of radio transmission guidance are used in this case, and so on.

How were those principles calculated in later generations?

It relies on computers and even supercomputers!

That is, hundreds of millions, billions, or even billions of calculations per second!

They only need to calculate the corresponding equations, and then derive the first-order differential equation, and leave the rest to the program to run.

But what about Qian Wushi and the others?

Can only rely on pen and mental arithmetic, at most it is a hand-cranked calculator or the 103 machine in the capital that performs tens of thousands of operations per second.

It is not an exaggeration to say.

If someone in later generations tells Xu Yun that they can calculate the result in this way, Xu Yun will probably think that the other party is either Zhihu or Station B.

But right now, the opponents are Qian Wushi and Yu Min.

To know.

Even Bayesian filtering to estimate the probability density involves nothing more than a first-order differential matrix.

This difficulty is at least two to three levels different from the partial differential equation Yu Min faced when calculating the hydrogen bomb—after all, there are four variables: altitude, speed, angle, and frequency.

Yu Min was able to calculate the results of related partial differential equations, so the calculation appears in this model

Isn't that hard to accept?

After all, Yu Min's deeds were not blown out by himself, let alone some exaggerated false news.

Because there is a fact that is in front of everyone like ears:

If Yu Min did not have the calculated partial differential equation, the hydrogen bomb would not have exploded smoothly.

For example, why can’t Ah San of later generations come up with a hydrogen bomb?

One is international environmental issues, the five hooligans cannot allow Ah San to have a hydrogen bomb.

The second is theoretical issues—the biggest difficulty is the partial differential equation calculated by Yu Min, which Ah San has not been able to solve until now.

Think here.

Xu Yun felt relieved.

Too.

The strategic vision of the rabbits never needs to be doubted.

If you can think of using Jinta County as a bait, then the higher-ups must have considered the possibility of sending multiple U2s on the opposite side.

It seems that I despise these seniors too much

And just when Xu Yun felt emotional.

Didididi—

On the telegraph machine not far away, there was a sudden rush of printing.

See this scenario.

The liaison immediately took down the telegram.

Seriously untie it at least.

After a while.

The young liaison officer stood up with a bang, and said to Lao Guo and others:

"Report! According to the news from the comrades in the southeast, the three U2s stopped circling and started heading straight for Gan Province!"

"If there are no accidents."

"They should go straight to Jinta County, just passing by our heads!"