The military-industrial scientific research system of the academic master.

Fortunately, Guo Lin is already used to this situation.

What's more, according to Chang Haonan, there is nothing to lose if you can publish a good journal.

At least it can be used when evaluating senior professional titles in the future.

"I need some time."

Chang Haonan had already formed a general outline of this idea in his mind, but the more he dug deeper, the more he realized the complexity of this thing. It was definitely not something he could calculate on the spot in this conference room with a piece of paper and a pen. of:

"Researcher Xu, do me a favor, this time it may be a little complicated."

"No problem, what do you need from me?"

Xu Yang stood up and followed Chang Haonan to the nearby computer room.

"Improve some algorithms, of course it's just my ideas now..."

Only Guo Lin and others were left looking at each other.

"Guo Gong... what we are going to do next..."

Another colleague who was quite confident with Guo Lin was also confused by this sudden change of situation.

"Sigh... Let's sort out this set of things first. According to Chang Gong's opinion, publish IEEE Transactions on Aerospace and Electronic Systems, which can be regarded as a small top journal..."

Yan Liang received brand new components from Institute 14 the next day, but Chang Haonan asked that the modification work on the No. pod be put on hold for the time being.

He has confirmed the feasibility of this new theory through the system, and the next step is to implement the algorithm model step by step.

Once completed, it can greatly improve the performance of the planned JH-7 electronic warfare aircraft.

It is even possible to rely on this technology to directly track targets beyond the normal radar detection range!

……

Four days passed quickly.

Chang Haonan and Xu Yang gathered everyone from Institute 14 back into the research room.

"You should have all read the paper on volumetric Kalman filtering that Researcher Xu and I published?"

Chang Haonan skillfully took the new pen and paper from Guo Lin and asked the engineers around him.

Everyone nodded:

"Of course I have."

"Theoretically, by applying the CKF algorithm to the nonlinear observation equation, radar registration bias correction and target state prediction can be achieved. Combined with maximum likelihood estimation, it can even process target data in batches..."

Chang Haonan first briefly introduced the ideal situation, which is not difficult for everyone to understand.

"But in actual applications, we will definitely miss some signals, and there will be a lot of clutter in the area. The CKF algorithm is actually not that easy to use."

"So facing this reality, instead of blindly trying to avoid these irrelevant third-party clutter, we should find ways to use them to enhance passive detection of targets."

"Using third-party clutter?"

Another engineer behind Chang Haonan's eyes lit up:

"I have a younger brother who serves in the submarine force. I heard from him that during the Cold War, nuclear submarines from both the East and West had a tactic, which was to lay a mine at a known location and then detonate it at a specific time. Using the sound waves generated by the mine explosion, the entire Targets in the area undergo an active sonar detection that does not expose themselves, and the effect is much better than pure passive sonar.”

The former was a little surprised that someone could compare his ideas in this way:

"Yes, the mine you are talking about is our third-party signal source. It can be a civilian weather radar, a signal tower, or even radar waves emitted by other friendly or enemy forces in the area. But the stronger and more regular the signal, the better the effect will be.”

"Of course, Researcher Xu and I also combined the sequence difference histogram method to further improve the PRI algorithm mentioned by Guo Gong. The combined effect of the two methods will be a surefire success in electronic warfare."

"However, the speed of naval warfare is measured in minutes, while the speed of our electronic warfare is measured in microseconds, and targets often have speeds of hundreds or thousands of kilometers per hour, so the accuracy and speed of our data processing are fundamentally different. requirements.”

"So I call the set of things I'm going to talk about below the theory of stochastic finite sets (RFS)..."

Chang Haonan said and took out almost a book's thickness calculation process from under the table.

"woc..."

Guo Lin was so shocked by this scene that he almost exploded.

"First, let's define what a random finite set is."

This time, everything he wanted to say had already been typed out on paper, so he didn’t have to worry about writing and drawing:

"For a locally compact Hausdorff separable space E, the set composed of all finite subsets in it is expressed as (E). Then, a random finite set Ξ on E can be defined as a measurable map Ξ:w→(E) …”

"For an RFSΞ, the number of elements is expressed as |Ξ|, which is the potential of RFS. In addition, the elements in RFS are disordered, that is, the necessary and sufficient conditions for RFSΞ and RFSΞ′ to be the same are: (1) |Ξ|=| Ξ′|, (2) If the element ∈Ξ, then ∈Ξ′”

"..."

"..."

"In short, if we design a radar, including post-processing software, and implement this model in engineering, we can passively detect targets without actively emitting radar waves, and achieve effective monitoring and control. track."

When Guo Lin handed Chang Haonan the brewed tea for the eighth time, the theoretical explanation that lasted for more than four hours finally came to an end.

"Any more questions?"

silence.

The only sound that could be heard throughout the room was the hum of energized fluorescent tubes.

Chang Haonan took a sip of water.

He knew he needed to allow some time for reflection.

After all, even Xu Yang, even himself, who was cheating on the system, had to go through it for a while before he fully understood it all.

"Uh……"

The first person to make a sound was Guo Lin:

"If you think about it this way, wouldn't it be quite invincible? As long as our radar backend has enough computing power, even stealth targets can't escape?"

"And this shouldn't be just an electronic warfare method. All targets can be detected using this method."

Another person also replied with a look of astonishment.

"In theory, of course."

Chang Haonan put down his water glass and nodded:

"But you just said that you need to have enough computing power first. In reality, of course it is not that beautiful. Moreover, since the third-party radiation source or the target radiation source is not controlled, passive radar cannot guarantee continuous operation, or it requires someone who has the courage to do it. The sacrificed units of our side are used as the radar source, such as large drones or something..."

"In short, judging from our current actual situation, it is best to combine passive positioning technology to play a role in counterattacking the opponent's SEAD operations."

"Is it also effective against ground radar?"

Logically speaking, this technology that relies on radar to detect targets should be mainly used for air defense.

"No, no, no, you didn't understand me."

Chang Haonan shook the pen in his hand:

"It's not a SEAD operation, it's an anti-SEAD operation."

"When they want to hunt our radar, even if our ground radar is jammed, the radar waves emitted can still be regarded as an effective third-party radiation source for detecting the opponent's electronic warfare aircraft."

"The mantis stalks the cicada, but the oriole follows behind."

"It just so happens that the JH-172 in Factory 7 is at the end of its transformation. If we move faster, we can actually verify this tactic on it."

"So...we can be considered as developing a countermeasure algorithm for electronic warfare?"

Guo Lin never expected that the countermeasures that the 14 institutes had been pursuing for several years would be realized through this method——

You can interfere with me, but I can also directly destroy your whole family.

Thousands of dollars today, let’s celebrate Double 11