Chapter 1282 Rocket Power... There is a problem
Even if Chang Haonan is the person in charge of the hypersonic weapons project, it is impossible 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 selected person and his/her 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 investigation. Only then can you really take up the job.
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 has been successfully completed and passed all acceptance tests, and can start work at any time.
The relevant data from the test at the beginning of the year has been basically analyzed.
Everything is ready, all we need is the east wind.
……
A week later.
September 10, 2006.
Beijing.
A conference room in 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 have finally been 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.
"Dear 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:< br>
“Although the flight dynamics and proficiency of the waverider are still required before official type approval is obtained We will conduct some supplementary research on the coupling of multi-physics fields under sonic flight conditions, but as far as the current situation is concerned, it can be considered that we have the basic conditions to start research on waverider configuration hypersonic weapons..."
As soon as the first sentence was finished, 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 and verification bomb period of each unit and task group are basically the same, so I will not go into details about the repeated parts and only emphasize the new additions and changes.”
Hearing this, everyone present involuntarily straightened their backs.
"First and most obvious, compared to the range of only a few hundred kilometers, so only the end-guided double-cone verification projectile needs to be considered, the waverider is superb, even the air-breathing missile with a shorter range The power solution also has a range of thousands of kilometers, and if the gliding solution 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 guidance..."
"Here, the development plan of the terminal seeker and the responsible unit remain unchanged. , and 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 of course the representative they sent, Shen Maoyang, had already 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:
< br>“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, and there is no need to rely on the second-generation constellation of ground stations to send navigation signals. It is expected that the service will start in the middle of next 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 severe."
He said and looked at Shen Maoyang, who was sitting in the middle left position of the conference table:
“The first is starlight navigation. No matter what kind of hypersonic aircraft is planned, it can maneuver at high speed or in a large attitude. At any time, the exposure of the navigation star points in the imaging plane of the star sensor will cause a tailing phenomenon. This tailing will reduce the efficiency of star point information extraction, thereby affecting the subsequent star map recognition and attitude calculation links, which is not conducive to the aircraft. attitude accuracy.”
“In addition, when flying at hypersonic speeds, the surface of the aircraft is in contact with the air. The severe friction of the body 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, causing deviations in the star point center of mass position, and the attitude noise obtained at this time no longer satisfies Gaussian The white noise assumption 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, satellite navigation The frequency of the signal received by the receiver The rate change will exceed the tracking limit of the phase-locked loop, and the signal loop will lose lock, causing the satellite navigation accuracy to be greatly reduced, or even directly unavailable."
"This aspect requires you and those responsible for the development of satellite navigation systems. Cooperate with the Institute of Space Technology to use altitude angle adaptive multiple fade 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 explanation is quite detailed.
Therefore, it was not until about forty minutes later that we entered the second part:
“In terms of power, the superb gliding flying body itself is unpowered, while the boost section is It is planned to directly use existing medium- and long-range ballistic missiles and is therefore 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 program 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 left until after the meeting.
But the technical discussion before the project is of great importance, Chang Haonan hopes to solve it 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 heavy tone:
"The solid booster we currently choose uses AP/HTPB/Al propellant. By adjusting the The morphology and content of aluminum particles are used to control unstable combustion at the end of the work..."
"But the test results and theoretical analysis...are not consistent in any way!"
( End of chapter)