Chapter 37: Watching from the sidelines

"Sure enough, this should be error analysis and statistical models.

By manufacturing errors through statistical quantification of probability, simulate the impact of engine thrust deviation and environmental disturbance on the trajectory."

"This should be the dynamic trajectory correction equation system, correcting the dynamic trajectory by limiting the inertial navigation system to gyroscope drift and accelerometer noise!

That's right, the linear recursive least squares filter simplified here, combined with the piecewise stationary error model he gave, can effectively correct the mid-course and terminal deviations of the ballistic trajectory.

And here, the problem of converting the Earth coordinate system, missile body coordinate system, and target coordinate system is simplified into matrix operations, used for the generation of guidance instructions.

In terminal guidance, predicting the impact point through angle vector projection not only can increase accuracy now, but even if infrared-guided missiles are developed in the future, it can also reduce the demand for real-time calculation."

With the comparison of the notebook, Qian Xuesen interpreted more information from the mathematical model in front of him.

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

It is no wonder that the other party is so sensitive; the shadow left by infrared-guided missiles on Cultural Huaguo is too deep.

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

The feeling of being suppressed in this technology is too uncomfortable, and everyone in Cultural Huaguo's military technology line remembers it vividly.

"It cannot be used to build infrared-guided missiles, it can be used to optimize infrared-guided missiles.

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

I have communicated with comrades from the Shanghai Electronics Institute, Shanghai Materials Institute, and Xi'an Engine Institute; the biggest reason for the delay in project approval in the past lies here.

The AIM-9B used by the Americans uses lead sulfide infrared photosensitive elements; we don't have a high-purity lead sulfide single crystal growth process, and if we use domestic lead sulfide detectors, the sensitivity is at most 70% of the other party's.

The other party's detection distance is 8km, and our theoretical detection distance is only 5km.

In addition, the missile seeker needs high-precision germanium lenses; we simply can't mass-produce aspheric lenses whose polishing degree can reach one-tenth of the wavelength, and we can only rely on manual grinding, and the yield is not even 5%.

Coupled with the all-around backwardness of signal processing circuits, solid propellants, missile body structures, etc., even if we spend time building it, on the one hand, it is already backward, and on the other hand, it simply can't be used.

But now with angle vector projection to predict the impact point, even if we have a gap, we can reach a level that is enough.

In other words, in the past, even if we built it and launched it, we couldn't hit the other party, but based on angle vector projection to predict the impact point, at least there is a probability of being able to hit the other party.

In the future, if technologies such as materials, circuits, and photosensitive elements keep up, we can even achieve more precision than the other party's Sidewinder!"

Three hours passed in the blink of an eye, the darkness gradually retreated, and for a time the east was white.

However, for Cultural Huaguo, there are too many preparations to be made.

After confirming that the model transmitted back by Lin Ran is of great benefit to all aspects, the entire huge machine began to operate at an unprecedented speed.

Qian Xuesen didn't have time to rest at all, and was directly arranged to take a special plane to Bingcheng urgently to carry out a comprehensive upgrade of the DF-1 missile using the existing model.

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

According to his estimation, with the model given by Lin Ran to optimize the DF-1, it can at least improve the accuracy of the DF-1 to within 1 kilometer.

Not to mention whether it can be used, this is already an international first-class level, capable of exporting and earning foreign exchange.

Once verified successfully, it is also a direct slap in the face of the withdrawal of the Russian experts.

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

Because the models Qian Xuesen understood were all models described in language he could understand after Chen Jingrun's interpretation, and many models were still hidden in abstruse mathematical language, urgently needing mathematicians to interpret them.

Chen Jingrun finished all the easy-to-interpret ones in just one night, and the rest were hard bones.

"Academician Hua, your work needs to undergo certain changes, and the time to reunite with your family may become very little. Do you have the willingness to participate?"

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

"The country has needs, and I will not shirk."

Xiangjiang, Modern Terrace.

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

Meng Xiaodong is a famous Peking opera actor, known as the "Winter Emperor," who is currently living in seclusion in Xiangjiang and has not performed on stage for a long time.

Not performing on stage doesn't mean not caring about current events; she was naturally very curious about this figure who stirred up the situation in Xiangjiang this summer.

Simply looking at the newspaper, the other party is young, handsome, and talented, and is praised to the sky by the Xiangjiang media, known as a mathematical genius once in a few hundred years.

She was more curious about what the other party was looking for her to do.

Three years ago, Zhang Shizhao came to persuade her to go back; in her view, the only value she had left was to go back and teach, but Professor Lin is an American professor, could it be that he is persuading her to go to America?

Another possibility is that the other party is her fan and wants to see her.

It's just that this possibility, combined with the other party's age, is pitifully small.

However, Meng Xiaodong did not refuse the other party's visiting card, and was even quite looking forward to the intention of such talent looking for her.

"Professor Lin is indeed well-deserved; not only is his appearance imposing, but his entire aura is the typical aura of a scholar." Meng Xiaodong complimented.

"Thank you, Ms. Meng, for the compliment. I came here this time hoping that you can help me record a small song." Lin Ran took a staff from his suit pocket and handed it to the other party.

This intention was indeed something she hadn't expected. Meng Xiaodong picked up the staff, and besides the neat handwriting, the title made her eyes light up:

"Watching from the sidelines?"

After she finished reading, she tried to sing a small section along with it:

"..."

"This trip to the dust-covered banquet"

"How can I not see the change of the red face"

"The brilliance of the past in the cave paintings"

"But woke up to watch from the sidelines"

"..."

One thing that is impossible to escape when coming to Xiangjiang is to accept interviews; more accurately, Lin Ran also needs to accept interviews, and this song "Watching from the sidelines" is a song carefully selected for the interview.

As soon as you come to Xiangjiang, the other side makes a world-class short-range missile; it may be nothing now, but after Lin Ran makes waves in the American aerospace industry, it would be strange if some departments and some people don't dig it out to make an article.

A song "Watching from the sidelines" is certainly useless; what is most needed is to cooperate with General Electric to win the NASA order, prove his indispensability, and have the Morgan family and the Rockefeller family behind Professor Horkheimer join forces to protect him.

But others protecting him must also have a statement on the surface; "Watching from the sidelines" is the song he prepared to use to express his attitude.

Another song given to Cultural Huaguo is "Me and My Motherland."

After Meng Xiaodong finished singing, she applauded repeatedly, and the applause echoed gently in the living room:

"Good song, good tune, good charm, good metaphor, but it's a pity that Professor Lin found the wrong person; I am a Kun-Sheng, not a Dan-jue." ===== CHAPTER 38 =====