Chapter 1379 Thousand Eyes Survey the Sky


    The hot wind from the Gobi Desert slapped the glass windows of the canteen with gravel. Guo Lin took off his glasses and wiped the lenses. The oil condensed in the stainless steel dining plate reflected the shaking incandescent lights on the ceiling.


    He heard the sound of a dining chair dragging beside him.


    It was Xing Muchun who 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 and spoke again:


    "When I went to the plane to send the chief away, I noticed that they were also very concerned about hypersonic missile defense, or at least the early warning issue... Of course, this is not a secret, otherwise radar confrontation would not be temporarily added to this test. Part of it.”


    Xing Muchun sat back on the chair and took a mouthful of tea to relieve his greasiness:


    "Yes... Although the Americans have suffered a frustration in X51A, I think HTV2, the Falcon project is quite decent, and the superb technical difficulty of gliding is still not as difficult as the inhalation type, so we Although I took the lead, I don’t think it will take too long for the other party to obtain similar equipment, so I 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 other party was right, 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 reaches its limit, it is difficult to provide enough early warning time... let alone organize fire interception."


    Speaking of this, he put down his chopsticks, got up, put on his coat and prepared to leave:


    "So, I don''t think there is a need to arrange a confrontation between the two test launches in August and September... Just repeating it multiple times will not lead to different results, but will affect the morale of the participating comrades. ”


    For a radar station, the feeling of powerlessness caused by frequent faces with an opponent that is completely inconsistent 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 that way, too..."


    In fact, let alone Mao Dao radar standing there, even he could not help feeling a little frustrated.


    But it ended halfway through the words-


    He heard some unspoken sound from the other party''s words.


    The test shots in the eight or nine months are not arranged to confront each other, which means that the test shots in the future will continue?


    Sure enough, Chang Haonan said as he walked out of the cafeteria:


    "Wait for the end of the year or the beginning of next year, try the new warning principle..."


    Guo Lin was busy for half a night, and he had just finished his meal. He felt that his upper and lower eyelids were fighting.


    As a result, I immediately woke up after hearing this sentence:


    "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 information,


    "We analyzed the records during the Western Pacific observation X51A test flight in the past year. The three-dimensional imaging distortion rate caused by Doppler shift in the original data exceeded 47%. Fortunately, the ballistics are stable and there is no black barrier problem, and rely on the multi-base station deployment method and us The accumulated feature parameters can also achieve stable tracking.”


    His pen tip poked at 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 it 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.


    "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 the existing equipment before 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 real acceptance and put into use, it is probably not nearly two It''s been 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 over and over again, he decided to discuss another more specific part first:


    "That is, you already have a way of thinking?"


    Chang Haonan touched the stubble that had not been cleaned up in time:


    "Actually, it''s not the latest idea... I thought about it a long time ago, but I felt it was too exaggerated at that time, so I never really mentioned it. It was not until recently 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 somewhat beyond 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 directions of Guo Lin and Xing Muchun:


    "The detection of X51A last year essentially used the ultra-high-speed motion object detection method based on matching Fourier transform, and achieved matching processing with the echo signal by searching the target speed and initial distance, thus eliminating the return The impact of higher-order terms in wave phase on phase accumulation...but due to the limitations of equipment and construction period, cross-distance unit movement correction for the echo envelope is not achieved."


    Xing Muchun had almost never been exposed to work in the radar field, and now he was just listening to the excitement.


    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 had a look of "You are teasing me":


    "But this is determined by the characteristics of hypersonic itself... How can we obtain enough accumulation time?"


    “So I improved a new transformation method.”


    Chang Haonan pointed to the lower half of that page and said:


    "The signals captured by multiple antennas can be accumulated to satisfy the conditions for cumulative time."


    Guo Lin narrowed his eyes slightly, and did not speak immediately this time, but stared at the computer screen for a while:


    "But it''s fine if dual-base radars are not the case. Multi-base radars actually find it difficult to provide sufficient synchronization rate, and the accumulated errors on the stack will still be too large to accept..."


    Chang Haonan directly tapped 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 mid-range movement of echo envelope of hypersonic motion targets is usually the main contributor to envelope changes, so after solving the problem of time accumulation, only the movement term needs to be corrected.”


    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... means to set multiple antennas with very far distances on the same radar?"


    In fact, this is a literal guess, but it has achieved the effect to some extent.


    "That''s right."


    Chang Haonan directly gave further results:


    "Specifically, it is an interval of 154.08km, or an integer multiple of 154.08km... Of course, there is also certain errors, but the smaller the deviation, the less difficult it is to calibrate the moving term and the higher the accuracy."


    Having said this, Guo Lin must understand no matter what he does.


    It''s just still a bit unacceptable.


    "Let the two-part series...even more than a dozen antennas belong to the same terminal for control?"


    He subconsciously glanced at the map of China on the wall at the other end of the conference room.


    Even if you only deal with one direction in the north, it is probably a super project with an unimaginable scale.


    "So I''ll call it... Qianmuzhangtian for the time being!"


    (End of this chapter)