The Military-industrial Scientific Research System of the Academic Master Chapter 207

Chapter 207 Seizing the jamming pod!

 “What paper?”

The team leader patted the engineer named Guo Lin on the shoulder, trying to bring some authority into his tone, but the unstoppable smile on his face made his efforts in vain:

 “Stop being so secretive and tell me quickly!”

 Fortunately, the latter is not a light-hearted person, and he quickly gave a further explanation:

“That happened when we were working on the cooperation between Thunderbolt 11 and radar with the Second Bureau of Electromechanical Engineering.”

"One of the problems of Thunderbolt 11 in recent years is that the line-of-sight angular velocity signal extraction is not accurate. The farther away the missile is from the aircraft, the more serious the direct wave spurious signal is. The echo signal cannot be detected up to 20 kilometers away. Until the end of last year, At that time, a comrade from the Second Bureau saw an algorithm paper published in a foreign journal and used the theory in it to solve these two problems by updating the filtering method. "

“At that time, our 14th Institute discovered that for some specific deceptive active electronic interference, after multiple target echoes appear in the tracking gate, the filtering method can also be used to process the original echo and the new echo, and then By comparing the two processing results with the original memorized target motion data, the real target can be determined.”

The major general standing opposite was a little confused by the lot of proper nouns in this paragraph, but he was an Air Force officer after all, and he still had concepts about things like filtering and echo, so he understood it. Seven, seven, eight, eight.

However, Guo Lin has obviously entered the state, and is even ready to challenge the team leader in front of him with more in-depth knowledge:

“The specific implementation principle is actually that the radar pulse repetition period is known. Under normal tracking conditions, when the radar is relatively close to the target, the target echo will be earlier than the echo of the previous period..."

　　“Okay, okay…I already know that the model you mentioned is very powerful.”

 The major general quickly raised his hand to interrupt:

“But since this mode can solve deceptive interference, why do we need to set a separate button? Wouldn't it be better to directly add it to the radar's default working mode?”

 Guo Lin, who was only halfway through his words, still had more to say, but after all, he was facing a general, so he stopped talking:

“Because turning on this mode will affect the response speed and refresh rate of the radar, it is best not to turn it on when there is no anti-drag interference.”

 After hesitating for a moment, he added:

"Actually... because there are very few studies on towing interference in China, and they are basically at the theoretical or laboratory stage at most, so although we have built this function, we have never had the opportunity to test it. Before this time, it was still not very Make sure it works..."

"etc…"

Even though he had little understanding of the theoretical content of the other party, the major general leader quickly grasped the key points of this passage:

“The drag interference you mentioned is the reason why the radar lost its target after locking it for the first three times?”

  The Chinese Air Force officers in the 1990s must have paid close attention to the Gulf War.

In that war, both sides used a lot of electronic warfare capabilities. The coalition used electromagnetic interference to disable the Iraqi air defense system, and the Iraqi army in turn used electronic warfare equipment to resist the coalition's precision-guided weapons, forcing the latter to dream. After returning to Annan, I had no choice but to resort to the old method of carpet bombing to solve the problem.

So even though he was a little impatient with Guo Lin's unfocused way of speaking just now, when he heard an electronic interference mode that "has not been studied much in China", he immediately became sensitive.

“I wasn't sure yet, but since the anti-drying mode works, it should be.”

 Young engineers are still in the excitement.

After all, it has been nearly 30 years since the last time the Chinese Air Force shot down a target in actual combat. It can be said to be a record-breaking first victory, and he himself unexpectedly played a key role in this process:

"Current fire control radars basically use the Doppler effect to detect targets. This is a speed tracking system, and velocity gate drag jamming can give the radar false speed information, allowing the radar to track a false target. The radar field of view in the tracking state is very narrow, and it will naturally unlock within a few seconds. "

This time his explanation was concise and concise.

“Did the MiG-25 have this capability at that time?”

The Major General was a little surprised that this complex-sounding thing would appear on an interceptor fuselage designed in the 1960s.

This question really hits a blind spot. When everyone is busy celebrating, it is indeed easy to miss such details.

So Guo Lin on the opposite side also hesitated:

"I think... there shouldn't be. Although the relevant theory emerged not too late, pulse Doppler radar was not widely used in the 1960s. There seemed to be no demand for it, and the level of electronic engineering did not support it. "

 At this time he also realized the problem.

“Is there another electronic warfare aircraft in the airspace?”

Such an unconventional guess left the team leader speechless. He waved his hand and was about to say something when he saw a Chinese officer wearing the uniform of a lieutenant of the Pakistan Air Force trotting over:

“The report from the Gryphon is that the target deliberately controlled its speed and altitude before being shot down, so the opponent's pilot had parachuted out, and the aircraft was generally well preserved during the fall.”

 Hearing this sentence, the two people who were chatting about the electromagnetic interference issue brightened up almost at the same time.

Logically speaking, if the aircraft is hit by an air-to-air missile at 2.2 times the speed of sound, the aircraft will directly disintegrate at high altitude, and the resulting debris will probably fall within a radius of tens of thousands of square kilometers.

 Coupled with the fact that there are complex terrain and inaccessible mountainous areas nearby, it is simply impossible to completely search for the wreckage based on the organizational capabilities of the Israeli-Palestinian Army.

Moreover, if too many people are involved, the news may be leaked.

But if the target crashes as a whole, even if it falls into pieces after landing, the splash range will always be limited, and the manpower and material resources required will be much less.

The major general adjusted his military uniform, which was not quite fitting, and quickly made a decision:

"This matter cannot be delayed. You should immediately inform Pakistan of the situation and ask them to send a reliable airborne force and helicopters over. Be careful not to let the news leak out, especially not to let their Inter-Services Intelligence Agency know."

“Also, if you find the pilot who parachuted, don't make it public.”

 “In that country…”

“I will report it domestically, but the situation is urgent now. If we delay it, it may only increase the number of variables. We can only cut it off first and report later.”

Hearing this decisive answer, the lieutenant was stunned for a moment, then stood at attention and saluted:

"yes!"

“I think the questions we just had will be answered soon.”

The team leader looked at the lieutenant's leaving figure, took two deep breaths in succession, and then turned to look at Guo Lin:

“If we finally find the kind of…jamming equipment you mentioned on the wreckage of that plane, is it possible to imitate the same equipment with our current technical capabilities in China?”

 Then he may have felt that his request was a bit excessive, so he added another sentence:

“The functions are the same, but some requirements for specific performance can be relaxed.”

Guo Lin held his chin with one hand and lowered his head slightly, but his eyes that kept rolling proved that his brain was thinking rapidly.

 After about a few minutes, he finally answered:

"Electronic components such as ADCs and FPGAs are actually off-the-shelf products that everyone uses, and the design and printing of PCB circuit boards are not a problem. In fact, what we lack in China is specific algorithm development and corresponding programming and Parameter debugging capabilities, even if there are samples, can only provide a certain reference value unless they are particularly complete. "

 Hearing the end, the team leader's mood dropped.

  He thought that this thing could be done in a relatively short time, just like the replicas of captured missiles and drones.

However, the solemn atmosphere did not last long.

“But speaking of which, our country's recent progress in this theory should be very rapid...”

Guo Lin seemed to suddenly remember something:

“After all, the influential paper I just mentioned was written by two Chinese people.”

“Although interference and anti-interference are not exactly the same thing, it seems that there is no commonality in algorithm research.”

 “So you can ask for foreign aid?”

 The team leader's heart was filled with hope again.

"I can't guarantee it, but... I can try it after I return to China."

Guo Lin felt a lot more relaxed when he thought of this:

“It just so happened that the 601 Institute asked us if we could build a larger radar and install it on the aircraft. Now the total power supply of the two turbojet 14s, 36kW, has been wasted.”

“If we can get a set of jamming equipment, we can try to install it on it.”

 (End of this chapter)

Chapter end