For the engineers at the 14 institutes, the current situation is generally mixed.

The success of Pod 1 is a fallback, at least to make sure that you are on the right track.

Therefore, the No. 2 pod is facing an engineering design problem at most, and there may even be minor problems such as manufacturing or assembly processes.

This will have to wait until the test data and the radar data from the anti-aircraft artillery regiment are returned.

However, for Chang Haonan, it is obviously not enough to do this step

When he first arrived at the 14th Institute, he used the system to analyze the working principle of the seized pod, so this step will definitely not go wrong, and it is the miniature version of the No. 2 pod that really represents his own work.

So in any case, he still hopes to solve the problem quickly.

About 20 minutes later, the 713 aircraft, which had completed the test, landed steadily on the runway of Yanliang Airport.

Soon, the pods, one large and one small, were dismantled by the ground staff and moved to a workshop specially arranged for 14 to be used for testing.

Guo Lin and others then began to disassemble the pod and check whether there were any problems with the installation of the components in it, while Chang Haonan and Xu Yang took down the test equipment on the plane.

It can faithfully record the work of individual on-board equipment during the entire flight just now.

The first two rounds of testing, when Pod 1 was activated for interference, everything was normal.

When Pod 2 was opened, things got very strange.

At the beginning, that is, when the pod had not yet captured the radar waves shooting at itself, the data was still normal.

This shows that there is no problem at the power-on start-up step.

However, when the aircraft entered the detection range of the gunning radar and the jamming pod really entered the working state, the signal receiving end was abnormal.

This was true for both the third and fourth rounds of testing.

And as the distance from the radar body approaches, or as the energy emitted by the jammer increases, the signal recorded at the receiving end of the pod becomes more and more chaotic.

"Chang Bo."

Just as Chang Haonan was frowning and staring at the signal map on the screen to observe, Xu Yang's voice suddenly sounded from behind him:

"Zoom in on the last minute signal from the receiver."

Chang Haonan's content on signal and control was actually slowly taught by himself after being reborn.

Of course, thanks to the knowledge given by the system in several related projects, he is able to handle general application problems with ease.

However, compared with a person like Xu Yang, he is still slightly deficient in basic skills training.

For example, now, if you need to find the really problematic part from a bunch of complex lines, Chang Haonan may not be able to react faster.

But he has the advantage of being able to listen to others.

So immediately, according to Xu Yang's request, he enlarged and processed the last-minute records of the last two rounds of testing.

"Look here."

Xu Yang stretched out his hand and pointed to one of the curves:

"This curve, at the beginning, is very low in amplitude, almost invisible, but from the beginning of each cycle it will increase, and in the end it is even about the same intensity as the radar wave received by the receiver."

As soon as she said this, Chang Haonan immediately grasped the essentials:

"So it interferes with the input signal of the entire pod, resulting in abnormal output signals and worsening the interference effect on the radar......"

"Wait, this is a self-oscillating signal?"

"That's right."

Xu Yang snapped his fingers:

"So the situation is very clear, the problem is not in the components, so that Guo Gong and their side do not need to continue to investigate."

"Whew-"

Chang Haonan slapped his forehead with some annoyance, and then called Guo Lin and the others who were analyzing the circuit board in full swing on the other side.

If it's just a simple interfering signal, there are a myriad of possible sources.

For example, a certain part of the DRFM process is not working, or in the process of frequency division multi-channel sampling, there is a problem with the sampling clock of a certain channel, etc.

However, none of these problems can create a positive feedback self-oscillating signal.

The only possibility is that the isolation between the transmitting and receiving antennas of the pod is not high enough, and the high-power interference signal emitted by the transmitter is coupled from the receiving antenna into the receiver.

The people over there in the 14th institute are also from professional classes, although if they are allowed to find problems by themselves, they will not be able to see it at a glance like Xu Yang, but it is definitely not difficult to understand what Chang Haonan means when there is an explanation.

"That's ...... so"

Guo Lin also brushed his hair with an unexpected face:

"But we've already done polarization isolation?"

The so-called polarization isolation is to arrange the transceiver antennas in an orthogonal manner, one is vertically polarized, the other is horizontally polarized, theoretically speaking, there will be no crosstalk between the signals between the two antennas.

However, because it is impossible to achieve truly perfect orthogonal polarization when it is implemented in the project, it will still be affected somewhat.

"It shows that our polarization isolation is not high enough, and when the distance between the carrier aircraft and the radar antenna is close to a certain extent, the power of the transmitter will burn through the polarization isolation, affecting the normal operation of the receiving antenna."

Haonan put down the mouse in his hand, looked at the No. 1 pod not far away and replied:

"And I understand why Raytheon designed the pod to be such a large size......

"It does ......"

Xu Yang, who was the first to raise this question and has been troubled, also showed a clear expression:

"They can't solve the problem of polarization isolation, so they use the simplest and crudest physical isolation method, as long as the distance between the antennas is far enough, then I am not afraid of being affected."

Now that the problem is clear, the next step is to think of a solution.

In fact, the idea is logical.

After all, there are only three commonly used isolation methods for sending and receiving.

Spatial, polarisation, and temporal isolation.

The first is physically impossible to do because of the size of the pod, and the second is not possible due to technical problems, so naturally, the third is left.

So Guo Lin said his thoughts:

"What if we abandon the all-receiver-all-transmit mode and adopt the transceiver time-sharing working logic, such as full-pulse storage and forwarding interference, or short-pulse storage cycle forwarding interference?"

Xu Yang naturally thought about this, but she still shook her head resolutely:

"Then the advantage of our jammer is gone, short pulse storage loop forwarding jamming only uses a small segment of the radar signal to carry out end-to-end loop forwarding, the resulting false target signal will become very wide, and a slightly more advanced radar can easily distinguish the real and false targets."

"As for full-pulse storage and forwarding jamming, although the target produced is very real, the false target will lag behind the true target echo by at least one pulse width, and it is fine to deal with some airborne narrow-width radars, but if we use a 60 microsecond or even 100 microsecond width for a linear frequency modulation pulse compression radar like the Patriot, then our false target is directly 10-15 kilometers behind the real target, and it will not play a role in confusing the enemy at all."

After being blocked by Xu Yang as the last way out, Guo Lin really couldn't think of any other way.

"MD, it really makes sense for the Americans to make such a big thing...... It's so hard......"

Guo Lin patted the huge No. 1 pod beside him.

This guy with a length of almost 10 meters and a diameter of about 1 meter is an unportable behemoth for most tactical aircraft.

In addition to the MiG-25/31, it is really difficult to find a suitable tactical platform for it to use as a carrier.

In the previous life, the Su-30 carried the largest equipment with a length of 8.4 meters and a diameter of 670mm, while the record of the Su-34 was the Kh-47M2 dagger with a length of 7.5 meters and a diameter of 1.2 meters.

In other words, only the Su-34 can be hung up very reluctantly.

But for the time being, Huaxia does not have a model corresponding to the Su-34, and even if there is, the closure of the belly hardpoint is too high, and the front is blocked by the classic sagging nose of the flanker family, and the two sides are blocked by two air intakes, which is not suitable for placing interference pods that need to receive and transmit a large number of electromagnetic waves.

"Why don't we think differently?"

After a few minutes of silence, someone next to him finally spoke:

"Maybe it doesn't have to be a pod for this thing."

"I heard that the research progress of the institute on the active and passive SAR radar is also okay, is it possible to consider combining electronic jamming and electronic reconnaissance functions into one, integrating them into the Y-8 or H-6, and directly building a comprehensive electronic support aircraft? If you want to come to the Air Force, you will definitely like it. ”

This model is very close to the later high-tech 12/Y-9DZ electronic warfare aircraft in terms of thinking, and as he said, the Air Force really likes it.

Although it is difficult for this kind of aircraft to follow the tactical aircraft formation like the EA6B or EA18G to rush into battle and destroy the opponent's air defense network by physical means, it can at least cover in a relatively safe place, which is better than relying on low-altitude penetration to try your luck.

In addition, in non-wartime patrols and confrontations, larger platforms are also more comfortable than flying leopards or flankers.

In the previous life, the Huaxia Navy and Air Force made very good use of the advantages of the long time of high-tech series aircraft (the range of the Y-8/9 platform is actually not far, but the economic speed is relatively low), and greatly weakened the combat readiness level of the opponent's F15J/DJ and other main fighters by repeatedly allowing the Air Self-Defense Force to take off with super strength.

So much so that before Chang Haonan's rebirth, the air force was already thinking about using the F2, which was originally designed for ground-to-sea attacks, to carry out air interception missions.

That seems to be a good result.

Especially now that there is an urgent need for the Huaxia side to deploy naval and air forces in certain directions to declare their existence.

But just when some people had been moved by this idea, Chang Haonan, who had been turning his back to everyone and calculating something on the computer, suddenly turned around:

"Of course, we have to engage in integrated electronic support aircraft."

"But tactical electronic warfare attack aircraft can't just be without."

Children make choices, adults just say I want them all.

……

"But Chang Gong, the problem of self-interference after the pod is reduced is difficult to deal with......

Someone whispered.

In fact, Chang Haonan just perfected the inspiration that flashed in his mind on the computer, and then used the system to test whether it could form a closed loop.

The lack of systematic professional training is his weakness, but it is also his strength.

Compared with Guo Lin and others, Chang Haonan's mindset is obviously much less.

In the end, the answer is doable.

It's just that he didn't continue to build a new project through the system this time, but decisively chose the glorious white prostitute after determining that the idea was okay.

If possible, Chang Haonan still hopes that this matter can be completed by "himself" in the true sense.

It's not just about being challenging, it's about exercising your own abilities, especially your theoretical experience.

He discovered a long time ago that completing tasks of similar difficulty, there is not much difference between the number of research points obtained without the system and the amount of research points obtained with the system, but the ability points and experience gained are very different.

This is also very easy to explain, after all, the knowledge that I gnawed down little by little, in terms of the solidity of mastery, must be higher than the system directly recharged.

After being reborn, his engineering experience and management ability have made great progress, but although the [Theoretical Level] has also gained some experience points, it still stays at the level of LV2.

Of course, there is the factor that LV2 requires as much as 10,000 points of experience to upgrade LV3, but in any case, as the level of the projects involved is getting higher and more complex, Chang Haonan has begun to feel that the theoretical level of LV2 is a little inadequate.

For example, the multiphysics simulation modeling software mentioned when chatting with Yan Zhongzhong at the Sandaomen celebration banquet before.

He thought about it for a long time, and he also started to build some theories in his free time, but without exception, he failed to form a complete and feasible idea.

Therefore, it is necessary to "brush" some theoretical level of experience points.

But just as Chang Haonan was about to speak, a slightly younger engineer suddenly took over:

"In fact, I think we might as well integrate the pod and the carrier aircraft platform and consider them as a whole."

The former, who just happened to be gagged in his mouth, almost choked, but still motioned for the other party to continue.

"Our current idea is to hang two pods with the same function to superimpose interference power, but in fact, it is not necessarily necessary to do this, it can be completely ...... For example, on the left, the hanging pod is only responsible for receiving the signal from the radar, and then the computer processing of the aircraft is then responsible for transmitting the interference signal by the pod on the right......"

"In fact, the whole aircraft is designed as a pod that can fly, so that even if it is an aircraft with a relatively small wingspan like J-8C, it has a look of almost 9 meters, and there is a whole fuselage in the middle as a shielding isolation, which can fully meet the requirements of space isolation."

Good guys, open minds.

If it weren't for the fact that the atmosphere at the scene was still relatively serious, Chang Haonan even wanted to applaud.

The other party's remarks reminded him that it is very likely that in the past, when the electronic warfare planes of the United States and the Soviet Union faced similar situations, they used similar ideas to avoid the problem of self-jamming in the simultaneous jamming of sending and receiving.

In addition to the poor flexibility (an aircraft must be overhauled, and it is completely useless for ordinary aircraft to hang those two pods), and the fact that it can only interfere with the range of about 45-60 ° angle on one side of the aircraft fuselage (the interference signal of most jammers is effective in the arc area of 90-120 ° in front of it), so there are relatively strict requirements for the course, but there is no big problem.

It's actually a pretty viable option --

If it weren't for the fact that Chang Haonan already had a better solution in his mind now.

"Ahem...... The problem of self-interference is indeed difficult to deal with, but it is not necessarily impossible to overcome. ”

(End of chapter)