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

In the short few minutes that Zhu Xuejun was lost in thought, the target track on the display had already changed significantly.

"report!"

The operator noticed that neither of the two leaders was looking at the operating table, so he reported loudly:

"The target suddenly turned westward and is moving away from the border airspace!"

Upon hearing this, Fan Rongjian and Zhu Xuejun both looked delighted and quickly sat back at the command desk.

Then we found that, as expected, the high-altitude target that was difficult to deal with actually turned and lowered its flight altitude, apparently preparing to quickly leave the detection range.

"Is this...scared away by us?"

The former wiped the sweat from his forehead and showed a somewhat surprised expression.

"It is impossible for a battlefield surveillance radar alone to exert such a great deterrent effect..."

Zhu Xuejun didn't quite understand the situation at this moment, but he still waved his hand and replied:

"The other party's sudden departure means that either the reconnaissance target has been achieved, or the reconnaissance target has gone out of range..."

Fan Rongjian was obviously much more relaxed:

"That means... we are not a reconnaissance target?"

So far, they have only turned on one 64N6E radar, and the signal value of the long-range early warning radar is not high, at least not worth the fuss and the need to send out a strategic reconnaissance aircraft for detection.

"I guess so……"

In fact, at this point, Zhu Xuejun already had some guesses in his mind, that is, this somewhat nonsensical flight of the Americans might be related to the manned space mission.

The reason why they were in a hurry to evacuate was to avoid the spacecraft's return path.

After all, even though everyone has conflicts, they can still save face.

Even Americans are unwilling to take risks on security issues.

But since his superiors did not say it clearly, he had no choice but to keep his guess to himself and ordered Fan Rongjian:

"No matter what, report the situation immediately..."

And the other side.

Dongfeng Aerospace City also received a report from the Jincheng Military Region about 20 minutes later.

After all, everyone is not in the same system, and the PLA's own command chain is not very smooth, so the response speed is not that fast.

"Reporting to the commander-in-chief, the target that is suspected to be a large reconnaissance drone has left the dangerous airspace to the west."

Even though Chang Haonan had said before that the other party should not be able to detect any important information, when it really came to this, everyone couldn't help but breathe a sigh of relief.

"It seems that the Americans have returned empty-handed this time..."

The commander-in-chief slowly sat back in the command seat, with a hint of relief in his tone.

"That's not entirely true..."

Shen Junrong denied it on the surface, but the raised corners of his mouth showed that he was just joking:

"The spacecraft was changing its orbit in the last orbit and preparing to return. They should still be able to capture the control and feedback signals between Shule Station and the spacecraft..."

After he finished speaking, a few other people nearby started laughing.

After all, measurement and control signals are almost completely public.

It is equivalent to the Americans spending a lot of effort only to get information that could be obtained by making a phone call.

No matter how you look at it, it’s not a loss.

In fact, according to the original plan, the Shule Tracking and Control Station, in addition to tracking and control signals, does need to undertake a large part of the communication tasks.

But thanks to the work of the Qingluan satellite cluster, this part of the function was temporarily transferred to Haojing.

And that place is naturally beyond the detection range.

However, the relaxing time is always short-lived.

For most people here, it is still far from the time to truly feel at ease.

It is now 4:15 Beijing time, and there is only more than an hour left until the landing of Shenzhou V.

Therefore, after confirming that the emergency air situation would not pose a threat to the spacecraft's re-entry into the atmosphere, everyone returned to their work posts one after another.

After a while, Shen Junrong suddenly came to Chang Haonan again:

"Comrade Haonan, do you think that in this situation, we can mislead the target's route by interfering with the satellite positioning system to counter this type of reconnaissance?"

"what?"

After hearing this, Chang Haonan was shocked.

This idea can be easily linked to his operations in the Balkans four years ago.

However, Shen Junrong had already left the Science and Technology Commission at that time, so he should not have known the details of the incident.

However, the latter thought that Chang Haonan had not figured it out yet, and immediately explained:

"The Jincheng Military Region later provided a more detailed explanation of the situation and put forward this idea at the end of the report."

It was not until this moment that Chang Haonan noticed that Shen Junrong was holding a report that was thicker than the previous one.

Then he breathed a sigh of relief:

"In principle, it is possible... but it is very difficult."

"First of all, the GPS positioning system is currently being updated to the third generation, and the encryption level of the military code is several levels higher than the previous generation... If it is just pure suppressive interference, then relying on the power advantage of ground equipment, it may be possible to achieve it, but you said misleading..."

He shook his head:

"Either we can directly obtain the relevant parameters in some way, or we have to make a huge breakthrough in the deciphering level... including both the algorithm and the computing equipment. Otherwise, it will be difficult to achieve."

The fact that he was able to direct that shocking accidental bombing four years ago was an extremely low-probability event that was made possible by many coincidences.

It is impossible to expect it to happen again.

Moreover, even back then, it was thanks to the fact that the targets of interference were a few aerial bombs.

JDAM is a low-cost disposable product, so we can save money wherever possible in many places.

Even if the opponent switched to Tomahawk cruise missiles, it would be impossible to achieve such perfect results.

And drones, drones that cost hundreds of millions of dollars each...

It is impossible to have only one trajectory planning mode.

According to later experience, even if a drone like the Global Hawk is subjected to completely irresistible suppression interference, it can still return to the original route through the built-in inertial navigation system, or at least fly out of the interfered area.

Furthermore, drones are also operated by humans.

If the navigation signals are seriously deviated, the pilot can still be the last line of safety.

Shen Junrong continued as he flipped through the report in his hand:

"The concern of the frontline troops is that passive reconnaissance like today is fine. At most, we can go silent and counterattack. But if the enemy lingers outside the border and uses synthetic aperture radar or other means to conduct active reconnaissance of our sensitive areas, we don't seem to have a suitable response. After all, the enemy has not crossed the line, so it is impossible for them to really open fire, right?"

For a moment, Chang Haonan didn't know how to answer.

In fact, the most direct way is to build a similar drone yourself and fly around the opposite side.

If you disgust me, don't blame me for disgusting you in return.

But let’s not talk about the problem of the aircraft itself.

To enable drones to achieve long-distance flight, a complete communication satellite system is required.

Otherwise, you can only wander around within a few hundred kilometers around the control station.

China obviously does not have such a system yet.

Otherwise, he wouldn't have to bother with the Qingluan constellation.

"Although it's a bit difficult to counter drones, synthetic aperture radar... can actually be dealt with."

After some thought, Chang Haonan replied:

"In principle, most SAR imaging uses linear frequency modulation signals, so using digital RF storage technology similar to our airborne dry series pods, we can achieve frequency shift modulation interference or micro-modulation interference."

"Although the success rate of this type of interference is not 100%, it can be directed to a precise range and precise target, and will not affect other friendly or third-party equipment in the interference area like large-scale noise interference."

"Of course, it will take time to develop the technology..."

This approach is actually still a passive response approach.

Just like air defense.

There is definitely an effect, but if you only defend and don't attack, it's only a matter of time before you fail.

Therefore, Chang Haonan was still thinking about another possibility in his heart -

It is not about forging navigation signals, but directly forging satellite control signals.

It is equivalent to directly taking over the other party's control.

In this way, the drone will not trigger the automatic return mode and will not be interfered with by the other side's ground operators.

If this can be achieved, then misleading flight routes will be a piece of cake.

It's even possible... to capture the target directly!