Chapter 1528 Underwater Villain

"National Remote Sensing Center?"

Zhang Xi gently rubbed his forehead which was a little swollen and painful.

Military-civilian coordination without prior communication is actually not as easy as imagined, and involves many procedural issues.

"The key to this mission is to test the flight performance and penetration capability of the WZ-8 reconnaissance aircraft itself..." He said hesitantly, "From the current situation, the mission has been completed beyond the specification. Do we really need to coordinate with other local departments just for an abnormal radar data?"

Later, he proposed a second-best solution:

"Considering that the 'Confrontation-North' exercise fleet has already withdrawn from the relevant waters, we can have the Star City fleet send a ship to take a look on the way back... If there really is any special underwater landform there, then the depth detection function of the hull sonar will definitely be able to find any abnormalities."

At this time, even Cheng Junhong, who first proposed it, was a little hesitant.

After all, medium and high frequency electromagnetic waves cannot physically penetrate thick water bodies, so synthetic aperture radar detection of seabed topography still relies on special functional modules combined with inversion algorithms, and it is very likely that certain atmospheric signal fluctuations will lead to errors in the detection results.

"No need to go to such trouble." Just when the atmosphere was at a stalemate, Yuan Xiaokang, who was not far ahead, suddenly spoke up, "The onboard SAR of the ocean series satellites was also developed by our group. It's just that the institutes responsible for different modules may not be the same, but it's more convenient than coordinating with other units."

Cheng Junhong now realized that the researcher from China Electronics Technology Group Corporation was right next to him, and going to the Remote Sensing Center by himself would be a step too far.

He walked quickly to Yuan Xiaokang and said, "Engineer Yuan, can you remember which unit is responsible for the data processing algorithm?"

"We need to check this out... I remember that when we were developing Ocean No. 1, we encountered setbacks halfway through, and the people and departments involved were a bit complicated." The latter took out a laptop from his briefcase and found a place to sit down nearby. "But it's probably not the ninth, twenty-fifth or..."

Halfway through the words, the voice suddenly stopped.

"what happened?"

Cheng Junhong, Zhang Xi and others came forward curiously.

"Really... this is really hell..."

Yuan Xiaokang forced himself to round off the swear word that had just been uttered, and then turned the laptop 180 degrees.

I saw three words signed in the column of the project leader:

Chang Haonan.

Zhang Xi and Wang Zhijin had both worked in the navy for most of their lives, so they certainly couldn't react immediately to who this person was. However, Cheng Junhong had just participated in his project a few months ago, so she was also dumbfounded.

"what?"

The surroundings became quiet, with only the occasional tapping of the keyboard or clicking of the mouse by the technicians.

A few seconds later, Cheng Junhong confirmed again: "Is it not a duplicate name?"

In fact, this was the first reaction of many people when they saw this name in the past.

"It says Aviation Power Group on the back." Yuan Xiaokang quickly turned to the third page of the design plan. "I don't think it will be such a coincidence."

"..."

After another period of silence, Zhang Xi and the other man almost came to their senses and realized that the person in front of them should be an acquaintance.

"Go for an encrypted video call?"

He reminded tentatively.

"It's 2:40 in the morning now... If we don't sleep, others will have to go to bed too." Cheng Junhong rolled her eyes.

He actually knew Chang Haonan's work habits, but even if a leader called his subordinates in the middle of the night, it would easily lead to scolding, not to mention asking for help.

"Let's sort out the data and take a rest. We'll contact Academician Chang after daybreak..."

……

When the clock pointed to 9 o'clock, Cheng Junhong could hardly wait to dial the encrypted number.

After several transfers, the video call was finally connected. Chang Haonan buttoned up his lab coat and sat down on the chair, looking tireless.

"Chief Engineer Cheng?" Chang Haonan had not expected that Cheng Junhong's face would appear in the video call from the South China Sea Fleet. His hands paused for a moment. "So early, is there something urgent?"

"Academician Chang, I'm sorry to disturb you..." After a brief greeting, Cheng Junhong got to the point, "Last night, we used the WZ-8 to conduct a maritime reconnaissance and penetration test..."

"Sea breakthrough..." Chang Haonan was delighted: "Does that mean Plan B can be implemented?"

He has been running between Huairou Science City and Torch Laboratory recently, so naturally he has no time to pay attention to a mere multinational joint exercise.

As for Plan B of the WZ-8, there is no need to follow up after collecting enough power generation data through several rounds of test flights.

I didn't expect that in just half a year, the entire project progressed so rapidly.

"Uh... Actually, there was an emergency... Anyway, please let Engineer Yuan explain the details to you."

Yuan Xiaokang, who had been eager to try, quickly came to the front of the camera:

"Academician Chang, thanks to the improvement of the overall power generation capacity of the aircraft, I have developed a new underwater detection function for the SAR of the Wuzhen 8 based on the spaceborne SAR of the ocean series satellites. This flight also conducted an underwater terrain detection in the shallow waters of the relevant sea areas. However, after analyzing the results, abnormal radar echoes were found in the Luzon Trough area. I would like to ask you to help analyze it..."

"..."

"Anyway, I will immediately send you the specific development situation and the reconnaissance results of this flight..."

As Yuan Xiaokang spoke, he had already packed the files separately, preparing for encrypted transmission via a dedicated line.

But the action was interrupted by Chang Haonan on the other side of the network cable through the screen.

"Wait a moment."

Yuan Xiaokang raised his head again.

"I guess, Engineer Yuan, you added a velocity bunching module to the original SAR, and introduced normalized grayscale transformation and three-scale scattering model in the analysis process?"

Yuan Xiaokang's eyes suddenly widened, and after a long time he nodded dully.

For a moment he even wondered if the other party had been paying close attention to his research and development progress.

If so, does that mean that I have the potential to become successful...

Just as he was lost in thought, Cheng Junhong beside him quickly brought up the topic again to avoid a dull silence: "Have you seen our reconnaissance payload design?"

"Not really." Chang Haonan waved his hand. "In fact, when I first designed Ocean No. 1, I considered giving SAR the ability to detect underwater. However, the radar equipment was already close to being overweight, and coupled with platform limitations, I had no choice but to delete the velocity focusing module."

In one sentence, Yuan Xiaokang's dream was shattered.

Fortunately, he had a good psychological endurance and quickly came to his senses:

"In other words, you specifically preserved the tilt modulation module and fluid modulation module on the original space-borne SAR?"

Chang Haonan nodded: "Although these two modules have no direct effect, they can enhance the detection capability of large ship wakes. In the end, we decided to keep them."

At this moment, Yuan Xiaokang only felt admiration.

He had even been secretly delighted before because he had discovered an upgrade window that no one had noticed before.

After a series of fierce operations, I finally found out that the window had been reserved by someone else a long time ago.

"In short, normalizing the grayscale before signal processing can indeed preserve the underwater topographic features of the shallow sea area, but it cannot completely filter out the hydrodynamic waves inside the water body, so it will carry a lot of noise signals." Chang Haonan concluded, "We only need to perform an additional Gaussian filter."

Hearing this, Yuan Xiaokang's expression became serious again: "But I have considered this problem before and set the threshold for Gaussian filtering."

He transferred the processed SAR image to the computer screen and clicked on the share button: "But I still couldn't filter out the abnormal signal on the image."

After hearing this, Chang Haonan also felt that it was unlikely that the other party would make such a low-level mistake. Moreover, there was only one clutter on the screen and it was very obvious, which did not meet the characteristics of general hydrodynamic noise.

"If that's the case..." He lowered his head and thought for a moment, "It might mean that the hydrodynamic waves here are so large that conventional filtering cannot filter them out as noise..."

"..."

At the end, his voice became quieter.

Then, everyone realized the problem almost at the same time.

"!!!"

To be honest, there are only three types of so-called "large-scale hydrodynamic waves".

One is that the two ocean currents happen to converge in a shallow sea area.

Second, groups of blue whales are swimming underwater.

But obviously, neither of these two situations conforms to the actual situation of the sea area in the SAR map.

Then, there is only one last possibility left.

There was a "fish" weighing tens of thousands of tons, and it happened to be sailing in shallow waters.

Underwater villain!