Chapter 246 Can it interfere with GPS?
As for Xu Yang's question, Chang Haonan couldn't figure out the mystery for a while.
The L005S electronic jamming device, which has a similar principle to this thing, is quite compact and can even be hung on the wingtips of the Su-27. However, the level of the United States in the field of integrated circuits is obviously much higher than that of its big brother in the north. It seems that it has no It is necessary to come up with such a design that is a bit silly, big and dark.
But for this kind of problem involving engineering practice, there is absolutely no future just relying on brainstorming.
We still have to build a prototype for experimentation.
And despite the fact that it took Chang Haonan and Xu Yang half an hour to analyze the hardware structure, in fact, even if the 14th Institute only relied on itself, it would only take a few more weeks to complete.
To truly replicate the electromagnetic interference function of this pod, a series of issues such as software design and functional debugging need to be solved.
Fortunately, with such a reference, the process from circuit principle to circuit design should be easy to follow.
"So next..."
Guo Lin subconsciously turned his head and looked at Chang Haonan beside him.
"Next, we will first test the parts of the wreckage that are not completely damaged, and then design something with the same function based on our analysis to see if we can fully restore the effect of the American pod..."
Chang Haonan arranged the next tasks in an orderly manner.
After his management ability increased to lv2, he has gradually become accustomed to leading a team of 10-20 people to work, so he seems quite comfortable at this time:
“Because we have nothing else to do. Analyzing and decoding the software part of this device, so the algorithm design of FPGA can only be done by ourselves. Fortunately, Researcher Xu should be very good at this aspect."
Xu Yang, who had been suppressed by Chang Haonan all day, finally finally. Having found what I am good at, I happily agreed:
"No problem. Digital signal processing should mainly involve distributed algorithms (DA). In addition, if the performance of our components, especially DPRAM, is not enough, I can also assign a DA implementation structure to multiple independent N In the lookup table of parallel DA, reduce the size of the table and save some hardware resources."
"It would be great if others could do this." Chang Hao. Nan may still be worried, but Xu Yang's foundation in algorithm theory is still credible.
The efficiency of the two thighs far exceeded Guo Lin's previous expectations. He could not wait to start researching the next step of the plan, so he rubbed his hands excitedly:
"Then let's Start working after dinner?”
"There's no need to be in such a hurry..."
Chang Haonan looked at Guo Lin who looked very motivated and smiled and said:
"Just follow the usual pace, we are not rushing now. At what point in time is it important to maintain long-term and efficient work?"
"Oh, that's right..."
Guo Lin scratched his head:
"And you two have just arrived, and we haven't given you a call yet, so we asked you to start work."
A burst of laughter broke out in the not-so-spacious conference room.
Anyway, after confirming the next schedule, everyone changed into casual clothes and prepared to go upstairs for dinner.
"Chang Gong, Researcher Xu, although Beijing roast duck is very famous, the way we eat this duck in Jinling is also unique. You must try it."
Going out soon At the door of the building, Guo Lin, who was in a good mood, said to the two people following him.
Chang Haonan was already used to being treated as a native of the capital. As for Xu Yang... Judging from her accent, she should really be a native of the capital.
“Okay.”
When facing most people, the latter’s communication method still highlights the conciseness and conciseness.
But Chang Haonan next to him did not answer, but looked back blankly at the building behind him. "Speaking of which, your R&D building actually has two underground floors?"
Although Guo Lin didn't know why Chang Haonan suddenly asked this, he still answered truthfully:
"That's right, but the ventilation in the underground part is not very good, and it is rarely used. For this reason, the institute decided to put the pod there to prevent it from being hit by people who don’t know the inside story.”
Theoretically, everyone who can enter the building should have a sufficient confidentiality level. But it's always good to be careful about things like this.
For all other insiders, this can only be regarded as a common arrangement.
But it was different in Chang Haonan's heart.
Put a high-tech gadget captured from the Americans in the basement.
There were so many factors involved in this matter that it was difficult for him not to think of a rumor that had been widely circulated in his previous life.
A rumor related to the Balkans and F117.
Although judging from the later decrypted content, this statement is probably completely fabricated, but the incident that happened near the turn of the century can definitely be regarded as the eternal regret of the vast number of Chinese people in the previous life. one.
“Speaking of which, have you, the 14th Institute of Electrical Engineering, studied other interference devices before, such as...interfering with satellite navigation signals?”
After thinking for a moment, Chang Haonan finally found a less out-of-the-box question as an entry point.
“Our main direction is radar, so we will do more research on anti-jamming.”
Guo Lin, who had no idea what was going on, just thought the other party was casually chatting, and immediately shook his head:
"That is to say, in fact, in our country, whether it is interference or anti-interference, we are mainly studying passive factors, such as environmental clutter, etc. Active interference and anti-interference methods have basically only been theoretically studied before. , this is the first time a real project has been implemented.”
“Does Chang Gong think that the design idea of the jamming pod can also be used to interfere with satellite transmission?”
"Oh, that's not the case."
Chang Haonan pretended to be nonchalant and replied:
"The frequency shift interference is aimed at the coherent accumulation technology used in the PD radar signal processing process. It is not very useful for interfering with satellite navigation signals. It can only be used to simulate the Doppler frequency shift characteristics of the received signal. It is not a core technology."
"I just saw the pod. I wonder if a similar portable jamming device could be installed on our equipment, or on key locations that need to be protected from attacks by satellite-guided weapons, would we be able to avoid repeating... well, repeating the same mistakes as the Iraqi army did in 1991? ”
In this era, the Chinese people’s understanding of modern warfare basically comes from the Gulf War, or strictly speaking, from various legends about the Gulf War, although most of these legends are very different from the reality. It has nothing to do with cows, but it is still very useful to take out to temporarily block the gun at such times.
"Dr. Chang, if you are just planning to interfere with GPS civilian receivers, there is actually no technical difficulty, because the signal characteristics are all public. You only need to simulate a navigation signal with the same characteristics but stronger power."
< br>The person who spoke this time was Xu Yang:
“But the source code of military GPS is kept secret, and more and more accurate signal recognition technologies will be used. I’m afraid we need more sophisticated control. Theory and algorithms will do.”
Obviously, this is not a direction that can see immediate results.
But fortunately, Chang Haonan still has time.
Probably a little over two years.
“Of course I know this, but after the current radar jamming pod project comes to an end, GPS jamming can be considered as a future research direction.”
(End of this chapter)
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