The military-industrial scientific research system of the academic master.

Chapter 1261: Both the military and the people flourish

In the following days, both parties carried out efficient and secret data handover.

Although the basic DF-31 no longer has much strategic value today, the cooperation between the two parties this time also involves the research and development of the subsequent DF-31A and even a newer generation of strategic deterrence system, which is an absolute national weapon.

We must be on guard against the lessons learned.

Fortunately, Chang Haonan is not going to make a thorough improvement to the DF-31. He is only preparing to modify the energy management strategy of the solid rocket engine under multiple constraints from the control level.

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

Even so, it still took almost a week to complete it.

After signing, Yin Liangxing's face was full of anticipation:

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

A group of the size of CASIC has tens of thousands of projects on hand.

Although Yin Liangxing was personally in charge of the space fishing boat, the main person responsible for its implementation was his subordinate Ninth Research Institute.

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

This is very important for the Dongfeng 31A, which is about to be tested and will become China's most important strategic deterrent for a long time to come.

However, Chang Haonan's actions were faster than he imagined:

"If Mr. Yin is referring to the problem of orbital accuracy, then I have actually used 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, he suddenly stopped.

It seemed as if he instinctively wanted to make some noise to express his surprise, but at the last moment he held it back because of his identity.

Thus, a state of desire and restraint is formed.

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

"The specific implementation plan and effect will of course require multiple rounds of calculations and tests, but the basic idea is nothing more than calculating the equivalent pulse point vector of the three-stage power segment based on the Lambert problem solving method, and designing the rocket's glide-boost-to-orbit flight trajectory by splicing the state quantities of each flight phase, so as to maximize the rocket's end-of-orbit accuracy."

He opened a research proposal on his laptop, turned it 180 degrees, and pushed it in front of the other person:

"On the one hand, in the attitude alternation energy management method, when the remaining velocity increment is consumed, redundant position increment will be introduced, and the position change will affect the planning accuracy of the fixed-point guidance method for a single sub-stage. Therefore, it is necessary to select a specific velocity dissipation direction to reduce the impact of position changes on the calculation of equivalent pulse points. In addition, the energy management of a single sub-stage has the problem of insufficient control ability, so it is also necessary to allocate multi-sub-stage energy management shares to improve the accuracy of orbit insertion..."

"..."

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

"If we are trying to solve the Lambert problem..."

He briefly reviewed the knowledge in his mind:

"Then we need to find the starting and ending points that best match the energy provided by the rocket's sub-stage engines, and use them as the equivalent pulse point position vectors for the fixed-point guidance planning transfer orbit. Then, we can obtain the velocity increment contour map and surface map of the original orbit and target orbit parameters corresponding to the preset simulation conditions. And this..."

While he was hesitating, Chang Haonan immediately continued:

"This requires multiple working tests of solid rocket engines to gradually accumulate sufficient preset data to ensure accuracy."

Yin Liangxing nodded, his brows revealing a look of deep thought.

It can be seen that this condition troubled him a lot.

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

Chang Haonan sighed:

"After all, I am not a god. I can significantly reduce the number of full-process flight tests and complete a considerable amount of data collection through ground tests. This is basically the limit of what can be done at this stage... Whether it is missiles or rockets, real flight tests are always necessary. Besides, what kind of strategic deterrence is there if we don't test-fire strategic deterrent weapons?"

"And I am confident that even if the Americans who have the most experience in solid push come here, they won't be able to find a more efficient method..."

Yin Liangxing had no doubt about this.

The problem is that he also wants to accumulate data by firing every now and then like the Americans.

But I am short of money and I just can’t do it…

While muttering this in his mind, Yin Liangxing began to think of the most feasible solution.

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

Learn from the successful experience of sister units and gradually accumulate positive feedback in the application.

At that time, he thought that if our intercontinental missile business was really put to use, there would be no need to accumulate any positive feedback.

But after interacting with Chang Haonan these days, he suddenly had an immature idea.

"Academician Chang, if we count the origins of this disturbance, it should have started with the United States testing anti-satellite weapons, right?"

As the head of China Aerospace Science and Industry Corporation, Yin Liangxing asked this question obviously not to doubt the answer, but to seek recognition.

"Of course."

Chang Haonan nodded:

"If the UARS satellite had descended normally as planned, entered the adjustment orbit, and then gradually fell into the atmosphere, there wouldn't be so many things that happened 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 understood the other party's thoughts almost instantly:

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

Yin Liangxing, who was sitting opposite, obviously had never expected the plot to develop like this. He was stunned for a while before speaking:

"Academician Chang knows what I'm thinking?"

Chang Haonan smiled as if everything was under control:

"Even the most advanced carboxyl-terminated polybutadiene solid propellant currently in common use can only achieve a vacuum specific impulse of about 250 seconds, while even hydrazine propellants, which have poorer performance among liquid fuels, have a vacuum specific impulse of 300 seconds, which is almost the same as the next generation of solid propellants that can only be produced under laboratory conditions."

"So if we want to bring solid-fuel launch vehicles to the market and use space launches to accumulate relevant data and experience, we can only emphasize the advantages of solid rockets in terms of reliability and reaction speed, especially reaction speed, which traditional liquid rockets cannot replace in principle."

Yin Liangxing's expression changed slightly:

"But other than the context of a large-scale nuclear war, what other situations would require the rapid launch of a large number of spacecraft?"

"Small satellite launches, 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. By then, you can use the successful implementation of the space fishing boat plan to strike while the iron is hot for publicity... uh..."

In a flash, he quickly made up a name:

"Perhaps it could be called 'Orbital Express', or 'Space Rapid Response'..."