Technology invades the modern world

Chapter 36 Watching from the Sidelines

“Sure enough, this should be error analysis and statistical modeling.

By using statistical quantification of probability to create errors, we can simulate the impact of engine thrust deviation and environmental disturbances on the trajectory."

"This should be the dynamic trajectory correction equations. The inertial navigation system is limited by gyroscope drift and accelerometer noise to perform a dynamic trajectory correction!
That's right, the simplified linear recursive least squares filter here, combined with the piecewise constant error model he gave, can effectively correct the deviations in the middle and end of the trajectory.

Here, the conversion problem among the earth coordinate system, missile coordinate system and target coordinate system is simplified into matrix operation, which is used to generate guidance instructions.

Predicting the impact point through angle vector projection in terminal guidance not only increases accuracy now, but also reduces the need for real-time calculations in the future, even when developing infrared-guided missiles."

With the help of the notebook, Qian Xuesen was able to interpret more information from the mathematical model in front of him.

The middle-aged man next to him keenly caught the sensitive word: "Infrared-guided missile? Can it be used for infrared-guided missiles?"

It’s no wonder that the other party is so sensitive. The shadow left by infrared-guided missiles on China is too deep.

The first actual combat application of infrared-guided air-to-air missiles was related to China.

The feeling of being suppressed technically was extremely unpleasant, and everyone in China's military technology sector still remembers it vividly.

“It can’t be used to make infrared-guided missiles, it can be used to optimize infrared-guided missiles.

The biggest technological gap between us and America is in material technology.

I have communicated with colleagues from Shenhai Electronics Institute, Shenyang Materials Institute and Xi'an Engine Institute, and the biggest reason for the delay in project establishment in the past was...

The American AIM-98 uses lead sulfide infrared photosensors. We do not have the process for growing high-purity lead sulfide single crystals. If we use domestically produced lead sulfide detectors, the sensitivity will be only 70% of that of the other side at most.

The opponent's detection range is 8km, and our theoretical detection range is only 5km.

In addition, the missile seeker requires high-precision germanium lenses. We have no way to mass-produce aspheric lenses with a polishing degree of one-tenth of the wavelength. We can only rely on manual grinding, and the yield rate is less than 5%.

In addition, the signal processing circuits, solid propellants, projectile structures and other aspects are all backward. Even if we spend time to produce it, on the one hand it is already outdated, and on the other hand it is completely unusable.

But now we have angle vector projection to predict the landing point, even if there is a gap, we can reach a sufficient level.

In other words, in the past, we were unable to hit the enemy even if we built and launched the missile. However, by predicting the landing point based on angle vector projection, there is at least a probability that we can hit the enemy.

If the technology in materials, circuits, and photosensitive components catches up in the future, we might even be able to be more accurate than the opponent's Sidewinder!"

Three hours passed in the blink of an eye, the darkness gradually dissipated, and suddenly the east was bright.

However, there is still a lot of preparation to be done by China.

After confirming that the model sent back by Lin Ran was beneficial in all aspects, the entire huge machine began to operate at an unprecedented speed.

Qian Xuesen had no time to rest at all. He was arranged to take a special plane to the Ice City urgently to fully upgrade the DF-1 missile using the existing model.

The latest news from the south will be sent to him via telegram as soon as possible.

According to his estimation, with the model provided by Lin Ran to optimize the DF-1, the accuracy of the DF-1 can at least be improved to within 1 kilometer.

This is not to mention whether it can be used or not. It is already at the world-class level and can be exported to earn foreign exchange.

Once the verification is successful, it will be a direct slap in the face to the withdrawal of Russian experts.

In addition to Qian Xuesen, Hua Luogeng was also urgently transferred to a new unit.

Because the models that Qian Xuesen understood were all models that were interpreted by Chen Jingrun and then translated into a language that he could understand, while many models were still hidden in obscure mathematical language and urgently needed mathematicians to interpret them.

In just one night, Chen Jingrun finished the easy parts, leaving the remaining parts as the hard parts. "Academician Hua, your work will require some changes, and you may have less time to spend with your family. Are you willing to participate?"

Hua Luogeng was also a smart man and guessed the reason immediately.

"As long as the country needs me, I will do whatever it takes."

Hong Kong, modern stage.

"Ms. Meng, Professor Lin is at the door." Nanny Liu walked into Meng Xiaodong's room and whispered.

Meng Xiaodong is a famous Peking Opera actress, known as the "Winter Queen". She was living in seclusion in Hong Kong at the time and had not performed on stage for a long time.

Not performing on stage does not mean that she is not interested in current affairs. Naturally, she is very curious about the person who caused a stir in Hong Kong this summer.

Judging from the newspapers alone, the other party is young, handsome and talented, and is praised to the sky by the Hong Kong media, who call him a mathematical genius that appears once in hundreds of years.

What she was more curious about was why the other party came to see her.

Three years ago, Zhang Shizhao came to persuade her to go back. In her opinion, her only remaining value was to go back to teach, but Professor Lin was a professor from America. Could he really persuade her to go to America?
Another possibility is that the other person is a fan of your drama and wants to meet you.

It's just that the person you might marry is pitifully young.

However, Meng Xiaodong did not refuse the other party's visiting card, and even looked forward to such a talent coming to her.

"Professor Lin is indeed worthy of his reputation. Not only does he look dignified, but his entire temperament is that of a typical scholar." Meng Xiaodong complimented.

"Thank you for the compliment, Miss Meng. I came here hoping you could help me record a little song." Lin Ran took out a piece of musical notation from his suit pocket and handed it to the other party.

This was indeed something she had not expected. Meng Xiaodong picked up the musical notation. Besides the neat handwriting, the title caught her eye:
"Watching from the sidelines?"

After reading it, she tried to sing along a little:

".
This is a feast for the dusty

Why is Zhu Yanchang gone?

The splendor of cave paintings in the past

But woke up and watched

"

One thing you can't avoid when coming to Hong Kong is giving interviews. To be more precise, Lin Ran also needs to give interviews, and this song "Watching from the Wall" is the song carefully selected for the interview.

As soon as you came to Hong Kong, the other side developed a world-class short-range missile. It may not be a big deal at the moment, but after Lin Ran makes a splash in the American aerospace industry, it would be strange if some departments and some people didn't dig it out and make a fuss about it.

A song "Watching from the Wall" is certainly useless. What he needs most is to cooperate with General Electric to win the NASA order and prove his indispensability. The Morgan family and the Rockefeller family behind Professor Horkheimer join forces to protect him.

But if others want to protect him, he must have a clear explanation, and "Watching from the Wall" is the song he plans to use to express his stance.

The other song given to China was "My Motherland and I".

After Meng Xiaodong finished singing, there was a round of applause, and the applause echoed softly in the living room:

"It's a good song, a good tune, with great charm and metaphors. It's a pity that Professor Lin found the wrong person. I'm a Kunsheng, not a Dan."

(End of this chapter)