Chapter 422 Electronic warfare is not just interference

Another small and medium-sized event in mid-August was the official admission of the 8 graduate students.

As a special and ordinary member of the group, although no one has treated Chang Haonan as a normal doctoral student, the process must be followed.

Therefore, he still had to report to school and register his student status.

Fortunately, the school's management methods for graduate students, especially doctoral students, are very different from undergraduates, so for people like Chang Haonan who are bound to not follow the normal training plan, it saves a lot of trouble.

For example, he registered at the graduate school of the college a few days later than other students.

In this era, there is no Xuexin.com and online archives, so it doesn’t matter how early or late it is.

And just when Chang Haonan was about to enter the graduate department that day, he happened to meet two old acquaintances pushing out the door of Tang Lintian's office.

Li Jie and Xu Yang of the Institute of Computing Technology, Academy of Sciences.

After the development of the TORCH Multiphysics software was completed, considering that the latter was loaned out from her original unit in March this year and has been running around outside since then, Chang Haonan did not assign her a new task and directly asked the latter to return. Computing office.

As a result, they hadn’t seen each other for three weeks, but they met again at their own school.

What a fate.

"Xiao Chang?"

Tang Lintian, who personally saw the guests out, first noticed Chang Haonan on the other side of the corridor.

Then the other two people also looked here.

"Regular worker?"

"Comrade Haonan."

Li Jie suddenly smiled and walked quickly to Chang Haonan.

The latter also took the initiative to shake hands with the other party:

"Academician Li, long time no see."

In fact, the two had not met many times before. The main intersection was during the period when the software was just being designed.

At this time, Tang Lintian also followed closely behind and walked over:

"Xiao Chang, you came to the administration building today. Do you need my help?"

Since the last time the compressor research center passed the approval and started construction, Tang Lintian was eager for Chang Haonan to come to him every day with something to do.

You know, after learning the news, Qinghua University, Bingcheng University of Technology and Zhejiang University almost immediately found him and expressed their hope to "co-build" this research center as a participant.

Of course, the results obtained from this will naturally be shared.

More importantly, the alliance composed of several top domestic schools, which had always been shrouded in mystery before, finally extended an olive branch to Beijing Hang University.

With such immediate results, if he could do it a few more times, Tang Lintian felt that he would soon reach the pinnacle of his life.

It's just that I have been looking around for many days, but I still can't see Chang Haonan's person.

As a result, today was a good start, which naturally made him extremely excited.

However, Tang Lintian's eagerness did not receive a reciprocal response.

"I...come to register as a new student."

Chang Haonan answered truthfully.

This unemotional answer made the atmosphere at the scene a little awkward for a while, and even gave him a sense of deja vu.

Even Xu Yang couldn't help but hold his forehead and shake his head.

And Tang Lintian, who was full of hope just now, could only touch his temples in embarrassment:

"Oh, yes, you have just entered the Ph.D. program..."

It’s not that he has a bad memory, but with all the things Chang Haonan has done in the past few months, how can any normal person figure out that he is a young man who just received his bachelor’s degree a few months ago?

Finally, it was Li Jie who spoke, breaking this scene that Tang Lin would never forget for half his life:

"By the way, Comrade Haonan, Researcher Xu also wants to see you for something this time."

"what?"

Xu Yang obviously did not expect that the topic would suddenly be brought to her, and it was not her initiative to follow him today:

"You don't have to bring me here..."

But before she could finish speaking, Li Jie continued:

"Didn't you say before that there was a new algorithm that could reversely solve signal encryption? Comrade Haonan's new technology needs to be used..."

"But I have only completed the preliminary development of that algorithm..."

Having said that, Xu Yang finally explained the ins and outs to Chang Haonan:

"Okay, that's what happened."

"Remember when we were designing the electronic jamming pod, you mentioned an idea to me, saying that we could design a special antenna to simulate the directional signals emitted by satellites through the scattering effect of the ionosphere or comet trails? "

Chang Haonan was confused by the other two, but he did mention this idea to a few people such as Xu Yang and Ding Gaoheng, so he nodded:

"Of course I remember that the idea at the time was mainly to interfere with satellite navigation signals and use it to disable the enemy's precision-guided weapons, such as cruise missiles or satellite-guided bombs. However, this process does not require any complicated algorithms. .”

The difficulty of this matter mainly lies in the hardware, that is, the antenna design mentioned by Xu Yang, how to disguise the signal as being transmitted from a satellite.

The current GPS has just been put into use. Military and civilian uses only have different open frequency bands and different accuracy, and almost no anti-interference design has been considered.

In fact, due to its one-way communication characteristics, there is not much room for maneuver in terms of anti-interference.

So much so that until more than 20 years later, interfering with GPS is still a matter with a low technical threshold.

"If it's just a distraction, sure."

Xu Yang casually smoothed the hair around his ears:

"But that's a bit wasteful."

"So I am trying to develop a new algorithm that can reverse engineer and then restore the navigation signals emitted by the GPS satellites and re-emit them to generate any new coordinate points we want."

This sentence was a bit awkward to say, but Chang Haonan understood what she meant almost immediately:

"You mean, you can directly control it instead of just interfering with the other party's GPS navigation device?"

"Yes, but this requires support at both the algorithm and hardware levels." Xu Yang nodded:

"I originally planned to come to you to solve the hardware design problem after I understand the algorithm, but since I encountered it today, I'll talk to you first."

"..."

After listening to the other party's description, Chang Haonan gave a positive answer after some thought:

"It's indeed feasible. We can talk about it in detail later..."

In fact, it's not like he hasn't thought of similar ideas before.

However, if Chang Haonan was allowed to spend his own time, energy and even scientific research points to develop such an algorithm, the price/performance ratio would be relatively low.

Because although it is not difficult to deceive GPS, once this method is noticed by the other party, it is too easy to counterattack.

After all, whether it is navigation equipment or guided weapons, it is not just a method of relying on satellites.

Just add a filter program to compare the GPS signal with inertia or starlight, a guidance method that cannot be interfered with. Once you find that the coordinates given by the satellite have a huge drift compared with the integration result, just block the signal directly.

In the end, after a long circle, the effect is still similar to that of simple GPS interference, that is, it can only make the positioning inaccurate, but it cannot cause too obvious deviation.

But since Xu Yang has come up with this idea, she can be responsible for improving it.

It's okay to be a one-time killer.

Anyway, hardware design is different from targeted deception algorithms. The former is a one-size-fits-all thing. Even if the other party counterattacks, it can be used for other purposes.

Seeing the two chatting enthusiastically, Li Jie, who was standing next to him, secretly breathed a sigh of relief.

Perhaps because of the fact that she had worked with Chang Haonan for several months before, Xu Yang immediately transformed into a high-intensity stress monster after returning to the computing institute. In less than a month, four or five researchers who worked with her had their mentality exploded. .

This time he went to Beijing Hang University to discuss with Tang Lintian the construction of a second Sugon 1000A supercomputer funded by the school.

The reason why we brought Xu Yang, who had little to do with this matter, was to find an opportunity to throw her to Chang Haonan again——

You two, talented men and women, can play whatever you want, so let us ordinary people go...