Genius is just the threshold for me!

Time flies, and in the blink of an eye, it's New Year's Eve.

Although the project is currently in a critical phase, Lin Dong, the chief engineer of the game development service, assessed the project's progress and thoughtfully announced a three-day holiday yesterday.

Except for those who cannot leave Chengdu, employees living outside were able to go home for the Spring Festival yesterday.

Employees living in the staff quarters received couplets, lanterns, Chinese knots, and other items from the logistics department early this morning. In less than half a day, the entire community was transformed into a festive red-themed area.

"Xiao Dong."

It was a little after 3 p.m.

Zhang Xiali changed her clothes and called out to Lin Dong, who was curled up on the sofa playing on his phone, "Go to your godfather's place after you take a shower. Your dad and I will go help out first."

Wang Rui joined a project team and didn't come back for the Chinese New Year.

Seeing this, Lin Weiliang simply suggested that they have their New Year's Eve dinner at Wang Xingguo's place, so that the two families could celebrate the New Year together.

"Okay, you guys hurry up and go help. If your godparents can't wait and start cooking themselves, the New Year's Eve dinner won't taste as good."

Lin Dong waved his hand and replied.

He hadn't believed in Wang Xingguo and Su Ruohua's cooking skills before, but after trying them one day, well, he believed them.

It's not that it's a terrible dish, but it just needs to be cooked thoroughly to avoid getting an upset stomach.

As for the other flavors, textures, and cooking time, none of them match up.

[Xu Qingling]: Mom is making red envelopes. Guess how much your red envelope is?

[Lin Dong]: Do I even need to guess? ... Same as you.

[Xu Qingling]: I asked about the amount.

[Lin Dong]: I won't guess, I'm just like you anyway.

[Xu Qingling]: Never mind if you don't want to guess. Have you gone to Uncle Wang's place yet?

[Lin Dong]: Not yet. I'll go over after he prepares the red envelope. I won't go over if there's no red envelope.

[Lin Dong]: After we finish eating, come over and wish us a Happy New Year in advance. We'll earn an extra red envelope. The house at Godfather's place has the best angle and height. Later, you can watch the security department set off fireworks.

[Xu Qingling]: Okay, Mom asked me to help. I'll come find you later...

Lin Dong didn't reply to the message. He stretched, sat up, went into his room to get his clothes and take a shower. Then, he took his phone and keys and strolled over to Wang Xing's house.

"Xiao Dong, come in quickly and help me with this."

Lin Dong opened the door with his key. Zhang Xiali and Lin Weiliang were busy with the New Year's Eve dinner, and Su Ruohua was hanging lanterns. When she saw Lin Dong, she immediately waved and went over to help.

"Where's my godfather?"

Lin Dong walked over, holding the lantern, and handed it to Su Ruohua after she stood on the stool.

"Making phone calls in the study; there's no free time during the Chinese New Year..."

Su Ruohua gave a brief explanation.

As Chengdu Aircraft Industry Group (CAC) 001, although it is the 001 in the direction of technology research and development, it still receives a lot of interpersonal greetings during the Spring Festival and other holidays.

"alright."

After hanging up the lantern, Su Ruohua tested the light sensor on the balcony to prevent laser eavesdropping. Once she confirmed that there was no problem, she called Lin Dong in.

"Xiao Dong, the overall design of the Dongfeng-21D has been completed, and trial production, test flights, and debugging can begin after the New Year."

But I optimized that precise tracking control scheme several times, and 92.3% was the limit.

If we also consider the saturation interception by enemy air defense systems, the overall hit rate is only around 34%... Is there no way to further optimize this hit rate?

Su Ruohua went into the living room, looked at the anti-eavesdropping device that was turned on, and asked Lin Dong about the Dongfeng-21D anti-ship missile.

"Godmother, there's nothing we can do about it."

Lin Dong shook his head: "The mid-course range of the Dongfeng-21D missile cannot be concealed. Enemy air defense and anti-missile systems can lock onto the approximate range in advance. Even if it is saturated and intercepted, a 34% hit rate is already the limit."

Unless we can conceal the mid-course trajectory of the ballistic missile, preventing enemy air defenses from locking onto the attack range before the terminal dive, the hit probability will not improve further.

Currently, all ballistic missile defense systems worldwide are designed to detect missiles during their initial and mid-course phases and then calculate their trajectory.

For example, the THAAD system, which caused a great stir before, detects the far-infrared radiation of ballistic missiles during the initial launch phase and mid-course flight, calculates the trajectory in advance, and intercepts them at high altitudes in the terminal phase using high-speed anti-missile missiles.

There is also the US land-based GMD intercontinental ballistic missile defense system, which detects the far-infrared signals of long-range ballistic missiles and intercontinental ballistic missiles in the mid-course phase, calculates their trajectory and approximate impact range, and launches missiles in advance to intercept them.

If the initial and midcourse phases are missed, then the ballistic missile can be considered uninterceptable.

Because the terminal phase of a ballistic missile's dive is too intense.

After being accelerated in space, and further accelerated by Earth's gravity, the final speed easily reaches Mach 10, or even Mach 20.

If the missile defense system only detects the missile at this point, then the system will be unable to react at all.

"Hidden in the middle..."

After thinking it over carefully, Su Ruohua sighed and said, "Only Qian Xuesen's ballistics can achieve this."

"right."

Lin Dong nodded: "Qian Xuesen's trajectory can conceal the mid-course travel, or more precisely, prevent the anti-missile system from forming the calculation range for the impact point through the mid-course. Therefore, missiles using this trajectory can be considered uninterceptable."

"But this trajectory involves not only control of reentry into space, but also the study of ballistic trajectory and a very deep understanding of the aerodynamic configuration of hypersonic vehicles..."

Su Ruohua thought about it seriously, and said with some helplessness and disappointment, "Currently, there is no hope of a breakthrough, either domestically or even globally."

Qian Xuesen's ballistic trajectory was based on a theoretical model he proposed in the 1940s when he was still studying in the United States.

By utilizing the drag of the outer atmosphere, the missile glides along the edge of the atmosphere, skipping across water, making its midcourse trajectory unpredictable and thus uninterceptable.

But more than seventy years have passed, and still no missile in the world has adopted the Qian Xuesen trajectory.

In-depth research has revealed that this trajectory, in addition to being a space reentry trajectory control system, also tests the aerodynamic configuration for hypersonic speeds.

If the hypersonic aerodynamic configuration is even slightly different, the missile will be unable to maintain the Qian Xuesen trajectory, and the entire trajectory will become uncontrollable, resulting in a situation where even the launcher cannot control the missile's impact point...

However, without a precise solution to the ns equations and without a hypersonic wind tunnel, a precise hypersonic aerodynamic design is simply impossible.

"Godmother, we already have the JF-12 hypersonic shock wave wind tunnel in China."

Lin Dong wasn't too disappointed, and chuckled softly, "Maybe in a few years, we'll have missiles that use Qian Xuesen's trajectory, making them unpredictable and uninterceptable to the enemy."

The Dongfeng-17, which adopts the Qian Xuesen trajectory, made its debut in 19.

Based on the construction progress of the JF-12 hypersonic shock tunnel, it is highly likely that the project was secretly initiated around this time.

The only downside is that the Dongfeng-17 has a range of only 2500 kilometers, which means it can only strike targets near the island chain and cannot achieve intercontinental strike capability.

"Xiao Dong, come in for a moment."

At this moment, Wang Xingguo, who had been on the phone in the study, seemed to have received a call. He opened the door, came out, and waved to Lin Dong with an expression that was hard to tell whether he was shocked or serious.

"Godfather, what's wrong?"

Lin Dong got up curiously and walked over.

"Telephone."

Wang Xingguo pointed to the secure phone number on the desk in his study and whispered, "It's the boss's."

What? ? ?

Lin Dong stared at Wang Xingguo with wide eyes. When he saw the other man nod to confirm that he wasn't joking, he paused for a moment, composed himself, and went inside. Wang Xingguo then closed the door behind him.

"Xingguo, what's wrong?"

Su Ruohua walked over and saw Wang Xingguo standing at the door of the study like a gatekeeper, with a different expression on his face. She couldn't help but ask him a question out of curiosity.

"I don't know how to say it..."

Wang Xingguo opened his mouth, still somewhat unable to process what was happening.

"Say what you should say, don't you know how to say it..." Su Ruohua glared at her.

"It's Lunar New Year's Eve today, and my boss just called..."

Wang Xingguo paused for a moment, then pointed inside: "Let's chat with this kid..."