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

Chapter 1365 Phase Ghost
"I……"

Wang Hongrang, who had not yet recovered from the shock, was speechless for a moment.

Chang Haonan thought there was some difficulty:
"There shouldn't be any other problems, right?"

Wang Hongrang shook his head repeatedly:
"There will be no problem at the shooting range. I mean... are you planning to go there directly?"

This question made Chang Haonan a little confused:
"Well... our superiors have assigned us a special helicopter team. Although the weather conditions are not very good now, the weather forecast predicts that it will be sunny tomorrow morning."

Fortunately, Wang Hongrang had regained his ability to think and reorganized his words:

"No need to go back to the capital for a detailed analysis? Just take a look at the report..."

He originally wanted to ask if just taking a look would be enough?

But I also feel like it's a bit disrespectful to the other person.

However, Chang Haonan still understood what the other party meant and explained:
"Under normal circumstances, I would have to check the debug logs, or even set up a passive receiving device nearby to analyze the characteristics of the space-based signal within a specific time range... But this time it was just a coincidence that the other party just happened to hit the part I was studying."

Then he pointed out the window in the direction of target area No. 3:
"Some of the operating details of the electromagnetic prism system we are deploying match the description in their report, but there are still some details missing, so I have to go to the site first..."

"..."

Because the decision was made in such a hurry, the Maodao Radar Station did not receive relevant information from their superiors until the helicopter that Chang Haonan was riding in took off. They were told that a helicopter would land in about 90 minutes and asked them to prepare to receive him.

"A leader is coming?"

Liao Yongcai asked Guo Lin who was standing next to him and obviously knew more about the situation:
"The helicopter pad at our radar station has only been used twice since it was built. Once, the head of the Jincheng Military Region came to inspect it, and the other time, a soldier fell from a vehicle and was injured while repairing the radar..."

Guo Lin had just taken off his work clothes and was putting on his cotton coat:

"The leader is also an expert... In short, he is definitely here to solve the problem."

In fact, he had already served as the director of the 14th Institute of Electronics Technology two years ago. If nothing unexpected happens, he will be able to hold a leadership position at the group level in another two years. His apparent administrative level is very close to that of Chang Haonan.

It’s just that the other party not only has the title of academician, but the value of his position cannot be simply compared.

"Solve the problem..."

Liao Yongcai froze in his tracks:

"Is there something wrong with our analysis yesterday?"

He had waited so long for his own highlight moment, and it would be really troublesome if he was slapped in the face just one day later.

"It's hard to say. It's possible that Academician Chang has already thought of a solution..."

Guo Lin took a deep breath, his expression slightly complicated——

Although he and Chang Haonan have always had business contacts, they have not met for several years.

This time it happened that two people were responsible for the spear and the shield respectively, and I had thought of taking this opportunity to compete with each other in the air.

Although the probability of achieving an early warning of an attack the first time is not high, according to Guo Lin's previous thoughts, he should be able to get through it after all.

As a result, now he needs support from his opponent...

It's like the contest is over before it even begins.

Fortunately, it was not the first day that Guo Lin knew Chang Haonan, and he would not let his personal desire to win affect his work, so he quickly accepted the reality and began to direct the staff of the control center to organize the information so that the other party could start work as soon as they arrived.

……

"In fact, there is nothing wrong with your analysis. You just underestimated the enemy's decisiveness..."

Two hours later, Chang Haonan sat in front of the radar console and answered the question that Liao Yongcai couldn't help but ask:
“Polarization data analysis shows that during the third full-system diagnostic process, the sidelobe suppression rate of array No. 12 dropped by about decibels.”

He ran his finger over the knob of the spectrum analyzer. The depression in the 1.14 GHz frequency band was like a precisely cut wound. The central air conditioner at the Maodao radar station emitted a low hum, but it could not suppress the beeping alarms from the simulator. "Last night, I asked the Beijing Aerospace Control Center to overlay the orbital parameters of several military satellites on the electromagnetic environment map. Take a look."

Following the direction of Chang Haonan's finger, everyone gathered in front of the monitor:
"From 0400 to 0430 UTC, there were three suspicious satellites flying overhead. The STP-4D experimental satellite had a 76% overlap rate with the fault period. This number is not high, but if you consider that the satellite transmitting antenna may have a staring function, it is enough to interfere with you."

Traditional satellite-borne equipment is fixed on the satellite platform and the direction can only be changed by adjusting the attitude of the satellite itself.

Satellites with staring capabilities have an additional device similar to a gimbal, which can ensure that the device points to the same position on the Earth's surface during the satellite's movement, thereby reducing the operating time of the onboard engine and extending the satellite's life.

"STP-4D..."

Guo Lin searched his memory but didn't find much relevant information.

"A standardized satellite platform developed under the Pentagon's 'Space Test Program' to verify some cutting-edge technologies."

Chang Haonan explained:

"Specifically speaking, the STP4D is ostensibly used to test a new generation of Hall electric propulsion equipment, but the frequency of orbit changes after launch is not high, so it is obvious that it has other undisclosed functions."

Just like China naming its reconnaissance satellites "Resources" and "Ocean", major countries will launch some spacecraft with mysterious purposes, and we can basically only guess before collecting enough characteristic information.

And this STP4D is obviously part of the opponent's advance layout.

Now I guess they have noticed some clues, so they activated this secret agent.

"On the surface, the operations are very routine. For example, here, Doppler shift is used to compensate for orbital motion errors. It is a very common technology."

As Chang Haonan explained, he circled the subtle fluctuations in the spectrum. The magnified waveform showed a jagged feature:
"But in fact, conventional DRFM signals do not have such efficient adaptive characteristics. The waveform replication speed in this set of characteristic signals is three orders of magnitude faster than the usual requirements, so it is aimed at us."

Liao Yongcai was still digesting and absorbing the huge amount of information in the previous conversation, but Guo Lin had already figured out most of the key points.

Except for the reasons.

"But...why?"

He leaned close to the screen, as if he wanted to put his eyes into it:
"Just to delay our radar debugging process for a few days... no more than half a month at most?"

"Of course that's impossible."

Chang Haonan waved his hand and suddenly asked:
"Have you ever thought about why there were no problems with the tests of arrays one and two?"

Guo Lin certainly thought about this problem, but because the interference itself was not continuous, he just thought it was a coincidence at the time.

But looking back now with the conclusion in mind, I'm afraid it's not that simple.

Chang Haonan gave the answer directly without waiting for Guo Lin to reply:

"Array No. 3 is too close to the common-mode choke, and the characteristics of the side-by-side configuration itself increase the near-field coupling effect... As a result, if we eliminate interference and complete debugging in the usual way, there will be no abnormality in normal operation. However, as long as the opponent increases the interference level, there will be a flaw that can be exploited by the opponent."

Guo Lin's eyes widened slightly.

I had expected the Americans to play dirty tricks, but I had never thought they would play so dirty.

Fortunately, after preparation, solving the problem is not difficult:

"The FPGA board we upgraded last year supports real-time polarization agility and dynamic partial reconfiguration. We only need to reprogram the beam control algorithm, consider the ionospheric Faraday rotation effect, and add polarization compensation coefficients..."

"..."

After the solution was initially finalized, Guo Lin and a group of technical personnel quickly got to work.

Chang Haonan suddenly turned his head and looked at Liao Yongcai, who seemed to have not yet fully reacted:

"Director Liao, the interference that occurred to the 7010 radar years ago was probably not caused by a radar reconnaissance satellite as you guessed..."

(End of this chapter)