The military-industrial scientific research system of the academic master

In the following days, both parties conducted efficient and confidential data transfers.

Although the basic Dongfeng 31 does not have much strategic value to this day, part of this cooperation between the two parties also involves the development of the follow-up Dongfeng 31A and even a newer generation strategic deterrence system, which is an important national weapon in an absolute sense.

Yin Jian is ahead and has to be on guard.

Fortunately, Chang Haonan is not planning to make a complete improvement on the Dongfeng 31, but is preparing to modify the energy management strategy of the solid rocket motor under multi-constraint conditions from the control level.

Therefore, the data that needs to be transferred only accounts for a small part of it.

Even so, it took almost a week to complete.

After signing, Yin Liangxing looked full of expectation:

"Academician Chang, then I will wait for the good news from the Ninth Academy."

A group of the size of China Aerospace Science and Industry Corporation has tens of thousands of projects.

Although Yin Liangxing was personally involved in the space fishing ship matter, the Ninth Research Institute under his leadership was really responsible for the implementation.

If the improved rocket completed this time can achieve high-precision orbital entry, it means that the hit accuracy can be further optimized without making fundamental changes to the overall missile design.

This is very important for the Dongfeng 31A, which is about to undergo test launches and will become China's main strategic deterrent for a long time to come.

However, Chang Haonan's movements were faster than he expected:

"If Mr. Yin is referring to the issue of orbit insertion accuracy, then I have actually taken advantage of these few days to come up with a basic optimization idea."

Yin Liangxing was originally playing with the pen in his hand, but after hearing these words, his movements suddenly stopped.

It seemed that he instinctively wanted to make some noise to express surprise, but at the last moment he held it back considering his identity.

As a result, a state of desire and cessation was formed.

Chang Haonan didn't give him any more chance to be surprised:

"Of course, the specific implementation plan and effects will need to go through many rounds of calculations and testing, but the basic idea is nothing more than calculating the equivalent pulse point vector of the third-level power section based on the Lambert problem solving method, and splicing the states of each flight stage The rocket’s sliding and boosting flight trajectory is designed to maximize the accuracy of the rocket’s end-to-orbit entry.”

As he spoke, he opened a research plan on his laptop, then turned it 180° and pushed it in front of the other party:

"On the one hand, in the attitude alternating energy management method, redundant position increments will be introduced when consuming the remaining speed increments, and the position changes will affect the planning accuracy of the fixed-point guidance method for a single sub-stage. Therefore, a specific speed dissipation needs to be selected direction to weaken the impact of position changes on the equivalent pulse point calculation. In addition, the energy management of a single sub-stage has the problem of insufficient control capabilities, so it is necessary to allocate the share of multi-sub-stage energy management to improve the accuracy of orbit insertion..."

"..."

Yin Liangxing had not been away from front-line technical positions for long, and he quickly understood the planning strategy given by Chang Haonan.

"If we are solving Lambert's problem..."

He briefly reviewed the knowledge in his mind:

"Then it is necessary to find the starting point and end point that best match the energy provided by each sub-stage engine of the rocket, and use them as the equivalent pulse point position vector of the fixed-point guidance planning transfer orbit, and then obtain the original orbit and target corresponding to the preset simulation conditions Velocity delta contour plots and surface plots of orbital parameters, and this..."

Taking advantage of his hesitation, Chang Haonan immediately continued:

"This requires multiple working tests of the solid rocket motor to gradually accumulate preset data that is sufficient to ensure accuracy."

Yin Liangxing nodded, and his brows showed a look of deep contemplation.

It was obvious that this condition troubled him quite a bit.

"There's really nothing we can do about it."

Chang Haonan sighed:

"After all, I am not a fairy. I can greatly reduce the number of flight tests in the whole process and complete a considerable part of the data collection work through ground tests. This is basically the limit of what can be done at this stage... whether it is a missile or a rocket, really Flight tests of real weapons are indispensable. Besides, if there is no test firing of strategic deterrence weapons, what strategic deterrence can there be?”

"And I am confident that even if the Americans with the most experience in fixing push come here, they will not be able to find a more efficient way..."

Yin Liangxing has no doubt about this.

The problem is that he also wants to play every once in a while to accumulate data like the Americans.

But I really can’t do it because I’m short of money…

While muttering this in his heart, Yin Liangxing began to think about possible solutions.

At this time, he suddenly recalled that just a while ago, Academician Wang Zhiyong, who had taken over the Dongfeng 31 improved design work, inadvertently mentioned an idea to him.

Learn from the successful experiences of sister units and gradually accumulate positive feedback in applications.

At that time, he also said to himself that if our business of engaging in intercontinental missiles was really applied, there would be no need to accumulate any positive feedback.

But after having such contact with Chang Haonan these days, he suddenly had an immature idea.

"Academician Chang, if the origin of this turmoil is to be considered, it should have started when the United States tested anti-satellite weapons, right?"

As the head of the Aerospace Science and Industry Corporation, Yin Liangxing obviously asked this question not because he was wondering about the answer, but because he was seeking recognition.

"Of course."

Chang Haonan nodded:

"If the UARS satellite descended normally according to the plan and entered the adjustment orbit and then gradually fell into the atmosphere, there would not be so many things later..."

"In other words, anti-satellite weapons may become the main threat to spacecraft in orbit in the future?"

As soon as this question came out, Chang Haonan almost instantly understood the other party's thoughts:

"In the context of a possible nuclear war, there is indeed a high probability that satellites will be destroyed by space nuclear explosions or anti-satellite weapons in large numbers, but if President Yin wants to promote the normalization of solid fuel launch vehicles, then this reason may not be sufficient..."

Yin Liangxing, who was sitting opposite, obviously did not expect the plot to develop like this. After a while, he spoke:

"Academician Chang knows my idea?"

Chang Haonan showed a masterful smile:

"Even the most advanced carboxyl-terminated polybutadiene solid propellant currently used can only achieve a vacuum specific impulse of about 250s, and even the hydrazine propellant with poor performance among liquid fuels, The vacuum specific impulse is also at the level of 300s, which is almost equivalent to the next generation of solid propellants that can only be produced under laboratory conditions. "

"So if you want to bring solid-fuel carrier rockets to the market and use space launches to accumulate relevant data and experience, you can only emphasize the advantages of solid rockets in reliability and reaction speed, especially reaction speed, which is irreplaceable by traditional liquid rockets in principle."

Yin Liangxing's face changed slightly:

"But apart from the background of large-scale nuclear war, what other situations require the rapid launch of a large number of spacecraft?"

"Small satellite launches, and natural disasters..."

Chang Haonan replied:

"As I mentioned before, the solar storm that may break out in September this year may have an impact on many satellite payloads that are about to reach the end of their service life. At that time, you can use the successful implementation of the space fishing boat plan to strike while the iron is hot to promote it... uh..."

In a flash, he quickly made up a name:

"Maybe it can be called the 'Orbital Express', or the 'Space Rapid Response' plan..."