The military-industrial scientific research system of the academic master

Chapter 1282 Rocket power...problem

Even if 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.

Priority in file advancement was a treatment that could only be obtained by the two-bomb and one-star project back then.

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

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

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

On the other hand, during the period when Chang Haonan was in charge of the space fishing boat project, the JF14 wind tunnel located in Huairou Science City was 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.

Everything is ready, all we need is the east wind.

…

A week later.

September 10, 2006.

Beijing.

A conference room at the headquarters of Aerospace Power Group.

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

Compared with the mood of doubt during the last meeting, this time with the successful test firing experience as the confidence, everyone's confidence has naturally increased.

"Comrades."

Looking at the dozens of project backbones eager to try in front of him, Chang Haonan slowly stood up from the head of the conference table and came to the curtain not far behind him:

"Although some supplementary research is needed on the flight dynamics of the waverider and the multi-physics coupling under hypersonic flight conditions before official type approval is obtained, as far as the current situation is concerned, it can be considered that we have The basic conditions are in place to start research on waverider configuration hypersonic weapons..."

At the end of the first sentence, there was unprecedented neat and warm applause in the conference room.

Chang Haonan raised his hands and pressed them down several times before barely calming down the somewhat overly high atmosphere.

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

Hearing these words, everyone present involuntarily straightened their backs.

"First and most obvious, compared to the range of only a few hundred kilometers, so only the terminally guided double-cone demonstration projectile needs to be considered. The waverider is superb. Even the air-breathing power solution with a shorter range has a range of thousands of kilometers. level of range, while the glider If the plan uses Dongfeng 31 as the boosting force, the range of the gliding segment alone will be more than 5,000 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..."

"Here, the development plan and the responsible unit of the terminal seeker remain unchanged, while the inertial-astronomical-satellite multi-source navigation system in the middle of the range is responsible for the Eleventh Research Institute of the Aerospace Science and Technology Group..."

“…”

The Eleventh Academy has relatively rich experience in the field of composite guidance, so Shen Maoyang, the representative they sent, of course had expected it and just responded calmly: "Yes!"

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

“The good news is that thanks to my country’s achievements in the aerospace field in recent years, the Beidou satellite positioning system’s networking progress and positioning accuracy have been greatly advanced. The second-generation constellation that does not need to rely on ground stations to send navigation signals is expected next year. The service will start in the middle of the year, so a lot of trouble caused by positioning information conversion will be saved.”

"Also, during the testing process of other previous projects, I have basically verified the feasibility of electromagnetic signal transmission through the plasma sheath. However, the specific design plan needs to be combined with the overall situation of the aircraft, so the navigation signal itself and There won’t be much of a problem with signal transmission efficiency.”

"However... Comrade Maoyang, judging from the experience accumulated in the early tests, the difficulties you face are still very serious."

He said and looked at Shen Maoyang, who was sitting in the middle left corner of the conference table:

"The first is starlight navigation. No matter what kind of hypersonic aircraft is planned, when maneuvering at high speed or in a large attitude, the exposure of the navigation star point in the star sensor imaging plane will appear smearing. This smearing will reduce the star point. The efficiency of information extraction will affect the subsequent star map recognition and attitude calculation links, which is not conducive to the attitude accuracy of the aircraft. "

“In addition, when flying at hypersonic speeds, the severe friction between the aircraft surface and the gas will not only produce a plasma sheath, but also produce aero-optical effects, causing disturbances in the star point imaging within the star sensor window and deviations in the position of the star point center of mass. , the attitude noise obtained at this time no longer satisfies the Gaussian white noise assumption, which will affect the filtering accuracy of subsequent integrated navigation..."

"For this problem, you need to use the dynamic parameters measured by the inertial device to assist in the restoration of the trailing image, and use a robust filtering algorithm to improve the filtering in a disturbed environment in view of the colorization of measurement noise caused by aero-optical effects. Accuracy.”

"The second is satellite navigation. Although the signal transmission problem should be solved, the aircraft will produce a strong Doppler effect when flying at ultra-high speed. In the conventional GNSS/INS combined mode, the frequency of the signal received by the satellite navigation receiver will change. If the tracking limit of the phase-locked loop is exceeded, the signal loop will lose lock, causing the satellite navigation accuracy to be greatly reduced or even directly unavailable. "

"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 altitude angle adaptive multiple fade factors to make targeted improvements to the Beidou/INS deep integrated navigation system..."

"Then there's 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 explanation is quite detailed.

So, it wasn’t until about forty minutes later that we got to the second part:

"In terms of power, the gliding superb flying body itself is unpowered, and the boost 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 super project is the scramjet engine. This part is led by me and the Aerospace Power Group. The form of auxiliary power has not been determined at this stage. There are two possibilities: rocket booster engine and sub-combustion ramjet engine. , among which the rocket boosting plan is in charge of comrades from 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 a hesitant expression on his face.

Generally speaking, of course, leaders cannot interrupt casually when they are speaking. Even if they have questions, they must be discussed after the meeting.

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

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

Lin Chenggang's movements were stagnant when his name was suddenly called, but he quickly recovered:

"Yes, Academician Chang."

He replied with a somewhat serious tone:

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

"But the test results and the theoretical analysis... they don't match up in any way!"

(End of chapter)