The Military-industrial Scientific Research System of the Academic Master Chapter 236

Chapter 236 The Nine-Star Warlord and the Father of the Aircraft Carrier

Chang Haonan's answer just now and Guo Lin's subsequent reaction triggered good-natured laughter from everyone, including Xu Yang.

However, the discussion quickly returned to the topic related to the jamming pod.

“Guo Gong, where is your research on that pod now?”

Chang Haonan asked a question that he and Xu Yang were both concerned about.

“It has just begun, and there is no progress yet. Even the restoration is only halfway done.”

Guo Lin also put on a relatively serious expression when he was talking about business:

"Although the MiG-25 that was shot down had an average height and speed and was more than completely smashed, it happened to crash on a ridge in the Ladakh Mountains, causing the wreckage of the aircraft, and of course the pod, to be distributed separately. In the three valleys, the situation on the Pakistani side was more complicated, and we did not dare to mobilize too many unreliable troops to search the mountains, so it took a long time to find most of the key parts. "

"At present, we can only analyze the situation reported by the combatants during the operation. Let's not mention the function of radar reconnaissance. In the electronic interference part, it is certain that there is at least one relatively powerful velocity gate drag interference, and more parts need to be Waiting for the disassembly results to come out.”

“I don't think this is the only function.”

Xu Yang lowered his head and thought for a moment, and then replied:

"Although I don't know much about military radars, current pulse Doppler radars should all have the ability to measure distance and speed at the same time. As long as the relationship between distance and speed integral is used, it can fight against separate speed drag interference. As for the two J-8Cs being bothered for so long.”

Chang Haonan, who has more than 20 years of experience than everyone present, knows more about this:

"Tow interference is generally combined with false Doppler frequency shift interference and Doppler frequency shift flicker interference, which are frequency-shift interference functions that are specifically designed for PD radar coherent accumulation technology, so that the radar speed tracking wave gate is between the two interference frequencies. The real target speed and displacement cannot be stably captured, and the interference effect cannot be overcome by comparing the integral data alone. "

“But if so…”

Chang Haonan's explanation did not completely eliminate Xu Yang's doubts:

"I'm afraid that the pod must be very large, and the power consumption must be quite alarming. Whether it is using a traveling wave tube phase-shifting amplifier or a CNC phase shifter to achieve carrier frequency shifting, it is inevitable that the harmonic level will If it is too high, the effective interference power will be reduced. In addition, miniaturization of these two things is currently relatively difficult.”

Guo Lin shook his head:

“It is indeed not small, but most of the space is used to accommodate a synthetic aperture radar antenna, and the space used for electronic jamming equipment is not large.”

At this time, Chang Haonan noticed that there were many people outside the conference room. It was obvious that the big boss who entered the room at the end was about to come forward, so he quickly made a brief summary:

"Anyway, what Researcher Xu just said makes sense, so our core goal in studying this trophy should be to understand how it can effectively interfere with PD radar, and try to imitate and improve it. It is best to equip it. On our own aircraft, more than half of the 36kW power supply of the two J-8C engines is idle.”

In fact, Chang Haonan already had some guesses about this pod after hearing Guo Lin's description.

The incident of shooting down the MiG-25 was one of the butterfly effects brought about by his rebirth. There was no previous experience for reference, but the effect of this jamming pod sounded very close to that of the one often hung on the wingtips of the Su-27. Those two L005S active electronic countermeasures systems.

L005S is quite compact and consumes little power, but it has always had good results even until the beginning of the 21st century. The key is that it does not use traditional traveling wave tube amplifiers or numerically controlled phase shifters, but uses digital The radio frequency memory (DRFM) implements direct digital synthesis (DDS) to complete digital frequency shifting.

　　Yes, Big Brother was already able to produce components such as DRFM and FPGA in the mid-1980s. It was basically only behind the United States and did not rely on black magic to achieve electronic warfare capabilities.

What's more abstract is that when the Su-27's flight control was still using analog fly-by-wire, its supporting jammer had already been fully digitalized.

Of course, it has been another 10 years since the L005S was finalized, and the United States is still the super devil in the field of semiconductors. There must be other black technologies in that pod, but the basic principles may not change much.

Because in the previous life until Chang Haonan was reborn, the principle of deceiving and interfering with radar was still in this set of things.

It's just that the level of algorithms and components has improved.

It's just that Chang Haonan can only think about these things in his mind at the moment.

At this time in the timeline, he has never even seen the L005S pod on the Su-27 (the two aircraft at the air show did not have it), so it would be too fake to directly pick out other people's principles...

At this moment, a piece of exciting music suddenly played in the conference room. "Hours of Glory".

It is often used as background music for various celebrations or ceremonies.

Sure enough, a staff member soon reminded the attendees to return to their seats and the ceremony was about to begin.

The people who still had unfinished thoughts had to temporarily separate.

However, according to the agenda, the leader's speech and award ceremony will not be very long, and there will be a dinner afterwards, so there is still a chance.

According to the previously assigned seats, Chang Haonan and Xu Yang were actually next to each other, and both were in very forward positions.

But it makes sense to think about it. They are almost the only two people in the audience who are not members of the military, nor are they affiliated with state-owned enterprises such as the aviation industry or electronic technology group.

“In fact, that paper is quite influential in the control academic community around the world.”

Xu Yang, who was wearing high heels, followed Chang Haonan and whispered to him.

"How to say?"

The two of them found their seats and sat down while communicating in a voice that only the other party could hear.

“After the paper was published, my supervisor when I was studying in the United States contacted me directly and asked me if I was interested in teaching at Berkeley. It would be best if I could bring another author with me.”

Xu Yang's words almost frightened Chang Haonan who had just sat down.

For a moment, he even wondered if the other party was sent by someone to instigate rebellion.

But this idea was quickly dismissed.

Even if he wanted to instigate rebellion, it would be too stupid in this situation, and Xu Yang didn't offer any very attractive bargaining chips.

Not like.

“So you refused?”

Chang Haonan asked while maintaining a calm tone.

As expected, Xu Yang nodded:

“Of course, otherwise I wouldn't have had the chance to come here.”

“Originally, the conditions he offered were quite good, but after thinking about it, I still feel that I would rather work with you, Dr. Chang…”

Obviously, there is something in this.

But Chang Haonan didn't have time to think about it carefully.

Because all his attention was quickly attracted by the two people who had just walked in and sat in the middle of the rostrum.

He knew both of them.

Or to be precise, I have seen them all.

in the photo-

Today's battle is indeed huge!

(End of this chapter)

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