Chapter 1379 Thousand Messages of the Sky
The hot wind in the Gobi Desert wrapped the sand and slapped the glass window of the canteen. Guo Lin took off his glasses and wiped the lenses. The oil condensed in the stainless steel dining plate shook on the ceiling. incandescent light.
He heard the sound of a dining chair dragging beside him.
Xing Muchun was walking here with an enamel jar.
The celebration banquet has ended, and most of them have left long ago, leaving only the few who have been discussing the issue just now.
"Actually." Chang Haonan, opposite, saw Xing Muchun sitting back, said again: "When I went to the plane to send the chief away, I noticed that they were also very good. Care about hypersonic missile defense, or at least early warning issues... Of course, this is not a secret, otherwise the radar confrontation part would not be added temporarily in this test."
Xing Muchun sat back on the chair On, I took a bite of tea to relieve my greasiness: "Yes... Although the Americans have suffered a frustration in X51A, I think HTV2, which is the Falcon project, is quite decent. Add After all, the superb technical difficulty of the gliding type is still not as difficult as the inhaled type, so although we are the first one this time, I don’t think that after a long time, the other party may also obtain similar equipment, and you will definitely have to worry about defense issues at that time. ”
A weapon that, if both sides have and cannot intercept, forms a deterrent balance similar to nuclear weapons.
For the party who has obtained this ability first, it is obviously unwilling to see this situation.
Chang Haonan was carrying the last few pieces of meat without fine thorns on the sweet and sour fish. Hearing this, he curled his lips and said it might not be possible.
But the reason the other party said was correct, so he didn't care about the details:
"In short, the test results have shown that with the current technical level, even if the conventional early warning radar is done It is difficult to provide enough warning time to reach the limit...not to mention organizing fire interception."
Speaking of this, he put down his chopsticks, got up, put on his coat and prepared to leave: "So, the two test shots in August and September, I don't think there is a need to arrange a confrontation between Maodao radar stations... ...A simple repetition will not lead to different results, but will affect the morale of the participating comrades."
For a radar station, it is often facing an opponent that is completely irresistible, so The feeling of powerlessness brought about is very serious.
This is completely different from those goals that can be achieved through hard work, or at least hopeful achievement.
Guo Lin nodded immediately:
"I feel so too..."
In fact, even he couldn't help feeling a little frustrated, let alone Mao Dao radar standing there.
But he stopped halfway—
He heard some unspoken sound from the other person's words.
The test shots in the eight or nine months of the year will not be arranged, which means that the test shots in the future will continue?
Sure enough, Chang Haonan walked out of the cafeteria and said: "Wait until the end of the year or the beginning of next year, try the new warning principle..." Guo Lin worked hard for half a night, and now he Just after dinner, I felt that my upper and lower eyelids were a little bit of a fight.
Since I heard this, I woke up immediately: "Or...will we go to the conference room to explain in detail?"
...
This trip, Guo Lin came with doubts.
So he brought a considerable portion of the technical and operating data,
"We analyzed the records during the Western Pacific observation X51A test flight in the past year, and the Doppler shift in the original data caused by the Doppler shift The three-dimensional imaging distortion rate exceeds 47%, but fortunately, the ballistics are stable and there is no black barrier problem. Relying on the deployment method of multiple base stations and the characteristic parameters we have accumulated can also achieve stable tracking. "
His pen tip is poked in A violently shaking crest on the copy paper:
"And now we have to face more than twice this speed. Even if we continue to use the multi-base deployment form, it is not optimistic. Considering other interference factors, is it a bit radical to expect to solve the problem in half a year?"
It is already mid-June, and what Chang Haonan and Liang Yangang just said was that two more launches will be arranged by the end of the year.
That's only half a year of full calculations.
"It's really exaggerating to solve the problem in half a year."
Chang Haonan raised his hand and pressed down, making a gesture of calmness:
"My plan is to transform it on the basis of existing equipment by the end of the year to verify whether the new technology is feasible. If it is feasible, then consider turning into a formal project next year... As for the fact that it has passed the acceptance and put into use, it is probably not a near-term It's been two or three years..."
Guo Lin opened his mouth, but he didn't know where to start for a while.
The amount of information in this sentence just now is indeed very large.
If even Chang Haonan said that a project cannot be completed in the past two or three years, it means that the scale may be far beyond ordinary people's imagination. However, it is hard for Guo Lin to imagine that with China's current construction efficiency as the standard, even a radar of the 7010 scale is not worth the other party's words.
But after thinking about it for a while, he decided to discuss another more specific part first: "In other words, you already have a way of thinking?"
Chang Haonan touched his temples and didn't have time to clean it up "It's not actually my recent idea... I thought about it a long time ago, but I thought it was too exaggerated at the time, so I never really mentioned it. It was not until recently that I felt that the objective conditions were relatively sufficient "
To be honest, the 14th Institute of Electrical Science and Technology has built a medium-sized fixed phased array radar in less than half a year. Even considering the facilities left by the 7010 project, it is indeed Some exceeded his expectations.
This made a plan that had been left behind by him rekindled.
Chang Haonan turned on his computer, then turned the screen around and aimed at the direction of Guo Lin and Xing Muchun: "The detection of X51A last year was essentially used. The ultra-high-speed motion object detection method based on matching Fourier transform, the matching process with the echo signal is achieved by searching the target velocity and initial distance, thereby eliminating the influence of high-order terms in the echo phase on the accumulation of phase parameters... But Due to the limitations of equipment and construction periods, cross-distance unit movement correction for the echo envelope has not been achieved. "
Xing Muchun has hardly been exposed to work in the radar field, and now he is basically just listening to the fun.
But Guo Lin thought about it thoughtfully:
"But we have applied the Keystone transformation method?"
Chang Haonan shook his head:
"Strictly speaking, there should be no special implementation of envelope movement correction."
No mistakes, one song, one content, one in 6, one book, one bar, one reading!
He said, scrolling the mouse wheel and switching the document on the screen to a page full of calculation formulas:
"Keystone transformation method targets weak targets accumulated over a long period of time, but hypersonic weapons cannot allow the radar to obtain enough accumulation time, so it is inevitable that the effect is not good."
Guo Lin looked "You "But this is determined by the characteristics of hypersonic itself... How can I get enough accumulation time?" "So I improved a new kind of improvement Change method."
Chang Haonan pointed to the lower half of that page and said:
"The signals captured by multiple antennas can be accumulated to meet the conditions for cumulative time."
Guo Lin narrowed his eyes slightly. This time he did not speak immediately, but stared at the computer screen seriously. After a while: "But it's fine for dual-base radars, but it's difficult for multi-base radars to provide sufficient synchronization rate. The accumulated error on the superposition will still be too large to be acceptable..." br>Chang Haonan directly knocked on the table with his pen cap, his tone with excitement: "So I'm talking about multiple antennas, not multiple radars."
After a brief pause, he continued to add: "The middle distance movement of the echo envelope of the hypersonic motion target is usually the main contributor to the envelope change, so after solving the problem of time accumulation, Just correct the moving items. "
Perhaps because the authorities were confused, Guo Lin leaned on the back of the chair and thought for a while, but still did not respond.
On the contrary, Xing Muchun guessed something that he just listened to:
"Academician Chang just said the cross-distance unit...it means setting multiple distances for the same radar. Antenna? ”
In fact, this is a literal guess, but it has achieved the effect to some extent.
"Yes."
Chang Haonan directly gave further results:
"Specifically, it is an integer multiple of 154.08km interval, or 154.08km... ...Of course, there are certain errors allowed, but the smaller the deviation, the less difficult it is to calibrate the moving items, and the higher the accuracy."
After all this, Guo Lin must understand no matter what he does. .
It's just still a bit unacceptable.
"Let the two-part series be separated by hundreds of kilometers... or even more than a dozen antennas belong to the same terminal for control?"
He subconsciously glanced at the wall on the other end of the conference room. China map.
Even if you only deal with one direction in the north, it is probably a super project with an unimaginable scale.
"So I call it... Qianmuzhangtian for the time being!"
(This chapter ends)