Siheyuan: I eat melons while doing scientific research

Chapter 1411 No need to send it (I'm spending time with the kids today, so it's only 4k words. I'll finish it tomorrow).

As I said before, let's solve the problem of whether we have it or not first, and then solve the problem of whether it works well. As we all know, if you want it to work well, you have to pay a price, and right now we happen to be a little short on funds.

After all, Gao Zhendong mainly considered the use of both military and civilian equipment, or even more civilian use, and did not intend to rely on it to guide bombs. Nowadays, our bombs are accurate enough. Anyone who plays RTS knows that firepower overflow is not necessarily a good thing.

Moreover, active positioning technology is relatively simpler and easier to solve these days.

"Yes, the coverage is relatively ideal. With two GEO satellites, the ground points only need to be located in the east and west to cover the entire country."

The sub-satellite point is the projection of a satellite onto the Earth.

“IGSO’s considerations are also very reasonable. If it does improve performance, it won’t affect the core business. The implementation steps can be flexibly arranged, and the solution is relatively cost-effective…”

Even the committee leaders and the chief engineer thought Gao Zhendong's arrangement was very good. If it really could provide all-weather navigation and positioning for the whole country and surrounding areas with just three, no, even just two GEO satellites, then this was really worth doing.

Moreover, he even considered that one of the IGSO orbiting stars could be delayed. He really made everyone cry.

"What is the expected navigation accuracy in meters?" the chief engineer asked.

Gao Zhendong said with some regret, "It's hard to say now. If it's low, it's probably only about 150 meters. If it's high, it can reach about 50 meters, but neither is considered high."

He said that mainly because it's hard to say right now what level he can achieve with the most crucial component.

—Atomic clock.

He had information on atomic clocks, including various types, and the book was simply titled "Atomic Clocks." However, he wasn't sure what kind of atomic clock he could build in this era—a hydrogen atomic clock? A cesium clock? A rubidium clock?

Different clocks, and different technological stages of the same type of clock, ultimately result in different levels of accuracy. Our first-generation clocks have relatively higher errors. In addition, due to the navigation principle, a calculation station was added in the middle, which introduced more errors. Therefore, the error is about 100 meters. Gao Zhendong estimates that what he can achieve is also around this level, with a high probability that it will be slightly worse and a small probability that it will be better.

Back then, thanks to the existence of GPS and its accuracy, even the first-generation GPS was used more for special disaster prevention and mitigation communication applications than for its main function of positioning in civilian applications. This is why, even with the third generation, we still launched three GEO satellites to ensure satellite short messages. This thing is really useful!

Furthermore, prior to this, a large number of remote monitoring and reporting systems used domestically produced navigation satellite short messages, and we still need to ensure this application in the third generation. The only difference is that the third generation has expanded from plain text messages to include image messages.

Gao Zhendong had used it in his previous life. Whether it was for remote monitoring and reporting in his supervisor's research project or for providing support for hiking via text messages on his mobile phone, it worked quite well.

Therefore, this function must be retained. This is the only way for ordinary people or organizations to use such a high-end function as satellite communication, which is of great significance for speed, timeliness, and security.

Hearing Gao Zhendong's regretful tone, the first reaction of his comrades was that this comrade had lost his mind.

What are you regretting? Huh? 50-150 meters, all-time, all-area navigation, what more could you ask for? What are you regretting? Tell me why?!

Let alone 50 meters, 150 meters would be of great significance. Current tactical navigation systems are probably only at this level, and their longitudinal accuracy is not even as good as this.

However, considering Gao Zhendong's habits, his colleagues understood. When Gao Zhendong set high technical standards, they were truly exceptional. Many technical specifications and functions that seemed like impossible to his colleagues were commonplace to him.

The comrades in the army immediately tried to relieve Gao Zhendong's pressure. No matter how confident you are, your comrades don't want you to be under too much pressure, or you'll cause serious trouble.

"150 meters! We'll take 150 meters!"

The committee leader laughed: "Wow! You're quite bold. We haven't even decided to start the project yet, and you're already making demands."

The soldiers grinned and said, "Hehe, really not going? Are you really willing to give up? We only have the bare minimum requirement, which isn't unreasonable at all."

The committee leader was speechless for a moment; he couldn't refute these words at all.

“But Committee Member Gao, this is just the choice of track. With such a large distance, the communication problem is still unsolved. If this problem isn’t solved, then everything is just a mirage,” said a comrade who works in communications.

Gao Zhendong laughed and said, "You don't need to worry about that. I will handle this personally, and I'm confident in my ability. To put it simply, you just need to be confident in launching the 2-3 ton satellite to GEO and IGSO, while leaving enough payload space for me within the satellite. I will personally lead the way in solving the rest!"

The original first-generation navigation system weighed approximately 2.2 tons.

This requirement is neither too big nor too small for us now. After all, the technological development along this line is better than what Gao Zhendong knew in his previous life, there are more sources of technology, and the materials, electromechanical, and semiconductor aspects are more advanced.

Some are even more than "some".

Gao Zhendong had genuinely studied communication principles in his previous life, and possessed some advanced long-distance wireless communication technologies. Coupled with his support, he was very confident in this regard.

He doesn't even need to access the system; he already has a set of mature technical principles for long-distance wireless communication in his mind.

He said the comrades would handle the satellite platform itself, but he planned to work with the Twelfth Ministry of Machine Building to solve the navigation payload issue.

Ministry of Machine Building: Hey hey hey, here comes the work!

The committee leaders then turned to the comrades working on rockets and satellites: "Are you confident in meeting Comrade Zhendong's requirements?"

The leaders were well aware that Gao Zhendong rarely said things like "personally taking the lead," firstly because he was generally unwilling to put the word "taking the lead" out in the open, and secondly because he really didn't have that much time.

He said he would "personally take the lead," so the committee's confidence in what he just said was practically off the charts. That was practically a pledge to the emperor.

"No problem! We are confident that we can achieve this within two years! We have repeatedly studied and simulated the SSTO (Super Transfer Orbit) proposed by Committee Member Gao last time. It can play a very good role in saving fuel. The fuel saved can be used for many things, such as extending service life, reducing weight, and increasing launch weight. There are always ways to achieve these things directly or indirectly. In addition, we have also made some new progress in high-thrust engines and rockets. The orbital altitudes of GEO and IGSO are basically the same. We are still confident!"

"As for satellite platforms, Committee Member Gao mentioned the development of GEO satellite platforms last time. We have been working on this area, and the progress is good. The specifications are also suitable, so it will be useful."

The recoverable satellite technology that was exchanged with the North was just the right weight for a GEO platform, which saved some trouble.

Committee Member Gao immediately rolled up his sleeves and got to work. We couldn't let him down, so we went together. Committee Member Gao shouted, "Let's go! Let's go!" and so we went together.

"Yes, very good, very good." The leader nodded repeatedly. Although he didn't say anything else, the expression on his face seemed to say a lot.

He also remembered that Gao Zhendong had proposed some improvements to the technology for launching satellites from GEO orbit and the idea of ​​using geostationary orbit satellite platforms a long time ago. That kid's planning was really early on!

Gao Zhendong didn't stop there, adding a sentence that made his comrades extremely excited: "Moreover, with this system, we can also use a terminal about the size of a company-level radio station within its coverage area to provide near-24/7 satellite messaging services. Although we can only send a few dozen words, I think it will still be somewhat useful."

The venue erupted in chaos once again.

"Really?" About the size of a company-level radio station? All-weather, all-area? This means comrades can contact distant places anytime, anywhere on the ground?
How much can this accomplish? Or rather, how many comrades' lives can it save?
What do you mean, "dozens of words"? Judging from Comrade Zhendong's tone, he even seems a little regretful. Let alone dozens of words, even just a few words would be incredibly useful!

The earliest tactical communication protocols mostly used status codes of only a few words, with no more than 10 characters including parameters. Yet, they could do so much!

While existing positioning, navigation, and messaging systems have been deployed in key locations such as deserts and can greatly solve related problems, these positioning systems all have a problem: limited service range and are affected by terrain.

These systems are simply no match for satellites in the sky in this respect.

Putting aside other aspects, the simplest application means that, theoretically, a missing or lost comrade can send out a distress signal at any time, and the rescue team can narrow down the search area to within 150 meters, which is almost the same as finding them directly.

Moreover, the applications of this system are clearly not limited to this. It can be used on land, at sea, and in the air, and it can be applied to many industries.

Gao Zhendong nodded solemnly: "I guarantee it! As long as navigation works, then messaging service will work too. Although it may take a little time to find the satellite position each time we use it, and it may be affected by bad weather, it will definitely work!"

His face had an expression that said, "Guess why I really want to do this."

The leaders of the National Defense Industry Committee were at a loss for words. Looking at the expressions of the comrades on the military side, they were about to lose their temper.

"Leader, the committee still needs to take this matter seriously." Sure enough, the comrade in the army couldn't help but say that the "taking it seriously" part was just a pretense; what he really meant was, "Leader, this thing works, we have to do it!"

The leader and the chief engineer exchanged a glance: "Understood, understood, the committee will consider it."

No wonder Gao Zhendong wasn't interested in satellite broadcasting; he's planning something big.
-
A package arrived at the confidential room of a radar institute in the eastern region.

The comrades in the confidential office quickly delivered the package to the chief engineer, as specified by the sender.

When the chief engineer opened the package, he found a well-protected plastic box containing rows of chips, with a few lines of text on the top of each chip.

“DSP-6332N”

"6501"

On top of the chip was something like a thin instruction manual.

"6332 digital signal processing chip? The institute still has some in stock. Wow, this batch of chips was only produced in the first week of 65."

As you can tell from the name, it's a 32-bit digital signal processing chip. They've been using this for a while now, and its performance has improved a lot compared to the earliest versions, mainly due to the expanded bit width.

He muttered to himself as he opened the explanatory materials.

"Sent from Committee Member Gao...looks like there's something fishy about it. Holy crap! This chip is incredibly powerful!"

Perhaps because he had lived in the city for a long time, he spoke with a local accent, but he was able to use even the slightly vulgar local slang, which shows how shocked he was.

So, does this new code "N" mean "cow's nose"?
"Chief Engineer, what's wrong?" A colleague next to him asked, puzzled. It's just a DSP-6332, we use this stuff all the time, what's the big deal?

"Here, take a look for yourself!" The chief engineer handed him the instruction manual with a delighted expression.

"Holy crap!!! 8 times!!" This comrade couldn't help but exclaim.

According to the manual, there is not much difference between the DSP-6332N and the DSP-6332, at least from a usage perspective. This makes everyone very happy, as they don't need to modify too much of the program.

The only difference, apart from some changes in the parameters of the external resistors and capacitors, is the frequency.

The frequency of the 6332N is 8 times that of the 6332!
No wonder the chief engineer swore; anyone would have sworn back!
With this chip, the performance of the radar backend can be significantly improved. Moreover, this is undoubtedly a major benefit for new types of radar, as it is well known that digital radar can trade speed for performance and even functionality.

"Hey, comrades from the semiconductor industry, you're too kind. I don't know what to say, hahaha." The chief engineer looked very happy.

"Chief Engineer, I'll take this one first." The comrade next to him understood the principle of striking first and grabbed a chip in one hand and wouldn't let go.

"No, no, put it down right now! It needs to be centrally allocated, centrally allocated!"

The chief engineer couldn't tolerate his temper. Even when dividing the spoils, fairness and impartiality were paramount. If you just grab whatever you want, you might have an advantage, but what about the other comrades?

The comrade holding a sheet of chips didn't listen to him. He took off running, incredibly fast. First come, first served. As he ran, he shouted, "I'll have Engineer Meng come and complete the paperwork right away! Thank you, Chief Engineer."

The chief engineer gave chase, but his old arms and legs couldn't keep up with the young man. The young man, clutching a sheet of chips, shouted as he ran, "Chief Engineer, no need to deliver it, no need to deliver it! This stuff is very light, I'll take it back myself~~~~~~"

The chief engineer took two steps and stopped. This kid's cadence is pretty fast!
Forget it, they work with SAR radar, it involves a lot of computation, let them be.

(End of this chapter)