Chapter 1282 Rocket Power Problem

Chapter 1282 Rocket Power... There is a Problem

Even though Chang Haonan is the person in charge of the hypersonic weapons project, it is impossible for him to just pull someone into the research and development team with just a few words.

The priority right to advance files was a treatment that only those in the two bombs and one satellite project could obtain.

What's more, even if the selected person and his unit agree, key personnel like Xu Pengfei, who will be responsible for leading a task after coming in, will still have to go through a rather complicated political review and background check before they can actually take up the post.

Therefore, Chang Haonan only confirmed the other party's wishes after completing the inspection, and then did not mention the matter any more, but returned directly from Qiong Province to the capital.

Of course it would be impossible to distinguish between day and night if a war really breaks out, but as far as testing work is concerned, if the situation is really as Xu Pengfei just said, then it can be carried out simultaneously with near-space research work.

On the other hand, during the time when Chang Haonan was in charge of the space fishing boat project, the JF14 wind tunnel located in Huairou Science City had been successfully completed and passed all acceptance tests and was ready to start work at any time.

The relevant data from the test at the beginning of the year has also been basically analyzed.

All is ready except for the opportunity.

……

A week later.

2006 9 Month 10 Day.

Beijing.

In a conference room at the Aviation Power Group headquarters.

After nearly two years, the heads of all task groups under the hypersonic project and representatives of major participating units were finally gathered together again.

Compared with the last meeting where people were mostly skeptical, this time with the successful test launch experience as a backing, everyone's confidence naturally rose.

"Comrades."

Looking at the dozens of key project members who were eager to try, Chang Haonan slowly stood up from the first seat at the conference table and walked to the curtain not far behind him:

“Although some additional research is needed on the flight dynamics of the waverider and the multi-physics coupling under hypersonic flight conditions before formal type approval, as far as the current situation is concerned, it can be considered that we have the basic conditions to start the research of waverider configuration hypersonic weapons…”

As soon as the first sentence was finished, the conference room burst into unprecedented, orderly and warm applause.

Chang Haonan raised his hands and pressed them down several times before he was able to barely calm the overly tense atmosphere at the scene.

"The division of labor and verification period of each unit and task force are basically the same, so I will not go into too much detail about the repeated parts, and only emphasize the new additions and changes."

Hearing this, everyone present straightened their backs a little involuntarily.

"First, and most obviously, compared to the double-cone verification missile with a range of only a few hundred kilometers, only the terminal guidance is needed. The waverider is superb, and even the air-breathing power scheme with a shorter range has a range of thousands of kilometers. If the gliding scheme uses the Dongfeng 31 as a booster, then the gliding range alone will be more than 5000 kilometers. In addition, the flight trajectory is complex, and most of the time it operates in the atmosphere or at the edge of the atmosphere, so it must rely on full-range guidance..."

"The development plan and responsible unit of the terminal seeker remain unchanged, while the mid-range inertial-astronomical-satellite multi-source navigation system will be managed by the 11th Academy of China Aerospace Science and Technology Corporation..."

"..."

The 11th Institute has relatively rich experience in the field of composite guidance, so their representative Shen Maoyang had expected this and responded calmly:

"Yes!"

Chang Haonan nodded, pressed the page-turning pen in his hand, and turned the PPT on the screen to the next page:

"The good news is that thanks to my country's achievements in the aerospace field in recent years, the networking progress and positioning accuracy of the Beidou satellite positioning system have been greatly advanced. The second-generation constellation that does not rely on ground stations to send navigation signals is expected to start providing services in the middle of next year, thus saving a lot of trouble caused by positioning information conversion."

"Also, during the testing of other projects, I have basically verified the feasibility of electromagnetic signal transmission through the plasma sheath. However, the specific design plan still needs to be determined in combination with the overall situation of the aircraft, so the problems with the navigation signal itself and the signal transmission efficiency will not be too big."

"However... Comrade Maoyang, judging from the experience accumulated from the previous tests, the difficulties you face are still very severe."

He said as he looked at Shen Maoyang who was sitting in the middle of the left side of the conference table:

"First, there is starlight navigation. Regardless of the scheme of hypersonic aircraft, when performing high-speed or large-attitude maneuvers, the exposure of navigation star points in the imaging plane of the star sensor will be smeared. This smearing will reduce the efficiency of star point information extraction, thereby affecting the subsequent star map recognition and attitude solution, which is not conducive to the attitude accuracy of the aircraft."

"In addition, during hypersonic flight, the intense friction between the surface of the aircraft and the gas will not only produce a plasma sheath, but also aerodynamic optical effects, causing disturbances in the star point imaging in the star sensor window and deviations in the center of mass of the star point. At this time, the attitude noise obtained no longer meets the Gaussian white noise assumption, which will affect the filtering accuracy of the subsequent integrated navigation..."

"To solve this problem, you need to use the dynamic parameters measured by inertial devices to assist in restoring the trailing image, and use robust filtering algorithms to improve the filtering accuracy of the filter in a disturbed environment in order to solve the colorization of the measurement noise caused by the aero-optical effect."

"The second is satellite navigation. Although the problem of signal transmission should be solvable, the Doppler effect is very strong when the aircraft is flying at ultra-high speed. In the conventional GNSS/INS combination mode, the frequency change of the signal received by the satellite navigation receiver will exceed the tracking limit of the phase-locked loop, and then the signal loop will be lost, resulting in a significant reduction in the accuracy of satellite navigation, or even direct unavailability."

"In this regard, you need to cooperate with the Space Technology Research Institute, which is responsible for the development of satellite navigation systems, and use the altitude angle adaptive multiple fading factors to make targeted improvements to the Beidou/INS deep integrated navigation system..."

"Then there is inertial navigation..."

"..."

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The navigation and guidance system is the only part that involves the core of the hypersonic project but is not directly led by Chang Haonan, so his description is quite detailed.

Therefore, it was not until about forty minutes later that we entered the second part:

"In terms of power, the gliding high-speed flight body itself is unpowered, and the booster phase is planned to directly use existing medium- and long-range ballistic missiles, so it is not the focus of this discussion."

"The main power of the air-breathing hypersonic project is the scramjet engine. This part is led by me and the Aviation Power Group. The form of auxiliary power has not yet been determined at this stage. The two possibilities are rocket booster engine and scramjet engine. The rocket booster plan is in charge of the comrades of the Third Academy of Aerospace Science and Industry..."

When he said this, Chang Haonan noticed that Lin Chenggang, the representative from the Third Hospital, frowned slightly, with an expression as if he wanted to say something but hesitated.

Generally speaking, you cannot interrupt the leader when he is speaking. Even if you have questions, you have to wait until after the meeting.

However, the technical discussions before the project is launched are of great importance, and Chang Haonan hopes to solve them as soon as possible, or at least find out any hidden dangers.

"Comrade Cheng Gang, do you have anything to say?"

Lin Chenggang froze for a moment when his name was suddenly called, but he quickly recovered:

"Yes, Academician Chang."

He replied in a somewhat heavy tone:

"The solid booster we have chosen currently uses AP/HTPB/Al propellant, and controls the unstable combustion at the end of the operation by adjusting the morphology and content of the aluminum particles..."

"But the test results and theoretical analysis... they don't match up at all!"