Chapter 748 You have it and I have it all

Regarding Gao Zhendong's ruthless behavior of giving a sweet date and then a slap in the face, General Manager Lin did not complain at all about his back being sprained.

No technology is perfect and is bound to have its flaws. On the contrary, Chief Engineer Gao was able to raise the problems in advance, which helped them avoid or reduce the impact during design and use.

"Mr. Gao, please go ahead."

Gao Zhendong scratched his fingers and said, "First of all, there is a problem with all ground-to-air positioning, that is the positioning distance, which is actually the slant distance between the two. For aircraft, if they are far away, it is easy to calculate, and the error is not large. If they are close, they must take into account the height between themselves and the base station, and comprehensively calculate their actual distance."

Hey, I thought it was a big deal, but this is it? I know trigonometric functions. Mr. Lin thinks Mr. Gao is really rigorous.

"In addition, for targets at sea, the effective range of this thing is very limited, and it needs to be relayed. And the number of relays cannot be too many. If the number is too many, the cumulative error will be large."

This is indeed a problem. General Manager Lin pondered and said, "Well, that's true. We should consider making this thing smaller and using airplanes for relay. If we calculate based on the range of 550 kilometers, the relay range can be extended to at least 800 kilometers by using airplanes for one relay. This distance should be enough. There is no need to go further."

The range of 800 kilometers from the base is actually far beyond the current and even for a certain period of time, the limit of naval activities and strike range.

"But in this case, the terminal can't know the location of the relay, right? It can't calculate its actual location."

Without Gao Zhendong, General Lin solved it himself, but his tone was not as good as Gao Zhendong's: "Are you stupid? What is the simple communication function that I just talked about for a long time used for? When the repeater responds to the ranging signal, can't it just send its own position to the terminal? Joint calculation, even if there is a cumulative error of one or two kilometers, how much difference will it make to the navy and air force?! Even the army can use it!"

As a person who was spoiled by the global satellite positioning system, Gao Zhendong really felt that the error was huge. But to people of that era, what the hell was this called an error?
There is no error! Even if the distance is a little off, it is because I took the wrong route, not the navigation system.

"In fact, the biggest trouble for the army is that when the terrain is complex, the navigation base station must maintain a certain height. Since the combat area is relatively fixed and the combat time is long, if it is too far away from the air force airport and 24-hour relay support cannot be maintained in the air, there is a shortcut that can be used when there is no other way." Gao Zhendong added.

"Ah? Mr. Gao, tell me, tell me."

"If this system is small enough, you can make a tethered airship or balloon and hoist it into the sky for use. However, it is difficult to tether an airship or balloon. It is just an idea. At this stage, it is more realistic to carry it on an aircraft. Alternatively, you can put the triangulation positioning equipment on it. Two aerostats are more reliable than a single base station aerostat."

"Chief Engineer Gao, why is this happening? Aren't we just getting back to the old ways?" Even Chief Engineer Lin didn't understand what he said and raised questions.

"Because the single-station positioning angle measurement system needs to transmit signals 24 hours a day, and the signal power is not small!" said Gao Zhendong.

This is like a layer of window paper, which can be seen through at a touch. Mr. Lin is not a fool.

"Ah, I see. The ranging system of the transponder mechanism can maintain the minimum power consumption when there is no response. The high-power recovery only takes a moment. In this way, the power consumption is much smaller. If the design is appropriate, it can be powered by batteries. However, single-station positioning requires power supply. The weight of the power supply line plus the tether rope will bring great trouble to the development of the aerostat."

Gao Zhendong nodded: "Yes, that's the truth. Of course, we can also consider using high voltage power supply to reduce the current and the cross-sectional area of ​​the power supply line, which is also a way. But generally speaking, this is a crooked way, hehe. It's still a bit too difficult for us to build an aerostat that can tow the base station. I brought it up mainly to broaden our thinking. It's very troublesome to be practical."

Chief Lin smiled. "Chief Gao, it's not a bad idea. If there's no airship, we can consider setting up a commanding height. This is a device that can be tactically maneuvered. Also, there's no need to guarantee that the signal can be received in all conditions. It's enough as long as it can be received relatively conveniently. For example, on a mountain ridge."

Gao Zhendong patted his head and said, "Well, you are right. If we find a commanding height to set it up, we can guarantee a certain degree of use. Even if there are multipath propagation errors, as long as we can locate the area and combine it with the topography of the map, we can accurately determine our position."

Military topography has never relied solely on technical positioning methods, unless it is an unfamiliar area.

"That's the last big problem. This system has a blind spot. The blind spot is not far away, but nearby," said Gao Zhendong.

"The nearest place?" The comrades who were working on the positioning system fell into deep thought.

After thinking for a while, a comrade shouted, "I understand! On the head! On the head!"

Gao Zhendong nodded: "Yes, there is an inverted cone area above the base station with the base station as the apex. Signals cannot be distinguished within this cone, and positioning will be problematic. The apex angle of this cone is approximately between 120 and 140 degrees. In other words, the navigation system can only work from the line 20 to 30 degrees from the side of the base station to the ground."

After listening to this, General Lin heaved a sigh of relief. It was no big deal. If there was a blind spot at a long distance, I would be at a loss. But if there was a blind spot above my head, it would not matter. Two hours later, comrades from the Defense Work Committee, the Naval Equipment, the Air Equipment, and the Land Equipment gathered together to listen to General Lin's report.

"In other words, by learning from Comrade Gao Zhendong, you are confident that you can develop a 'three-five' single base station positioning system with a positioning distance of 500 kilometers, a ranging accuracy of 500 meters, and an angular measurement accuracy of 5 degrees?" The comrade from the Air Force said with joy.

"Yes, we have this confidence. In fact, according to Comrade Gao Zhendong's estimate, the limit of this system is even higher, but we took into account the technical environment and adopted a relatively conservative set of parameters."

General Manager Lin was full of confidence. When he was reporting, he still set an ambush. However, the ambush had to be set, but it could not be concealed. Otherwise, if he accidentally talked about this matter with Chief Engineer Gao in the future and inadvertently checked the accounts, some things would easily lead to misunderstandings.

The comrades in the Air Force rubbed their hands together excitedly and said, "That's enough, this set of equipment is good enough. As long as it can achieve this performance, other problems are our problems, hehehe."

The navy looked at them and said, "Look at what you have accomplished!" Then...

"That is to say, if this system is fully completed, it will be able to provide positioning capabilities within a range of at least 800 kilometers, with an error of no more than 3 kilometers? Right?"

General Manager Lin nodded: "Yes, the positioning and communication architecture planned by Comrade Zhendong can support this application. In fact, it can be further away, but in that case, the error will be greater."

The comrades from the Naval Equipment Bureau also rubbed their hands together and said, "Hey, 3 kilometers is fine, 5 kilometers is fine, it's all visual distance, visual distance."

Comrades who are just pretending to be good look at him and say, look at what you have accomplished!
"What about us? What about us?" The comrades from the Land Equipment Bureau could no longer sit still. It has nothing to do with me, right?

"Your situation is more complicated. You need to rely on aerial relays or set up navigation equipment at commanding heights to better support operations in complex terrain."

Read the error-free version at 69shuba! 6=9+shu_ba is the first to publish this novel.

"That's also good, hahaha, we are used to the hardship, it's good to have it, it's good to have it." The comrade from the Land Equipment Bureau showed a simple and honest smile.

The comrades in the air suit almost cried when they saw this. The army big brother was suffering too much: "Don't worry, we will try our best to provide you with air navigation."

"Then I won't be polite." The army comrade continued to smile innocently.

But the good news doesn't end there. Mr. Lin said, "Mr. Gao said that if this system works well, he has some application directions that everyone can use. But now the product has not been implemented, and we don't know the specific performance range, so we have to hold off for the time being."

Even the Defense Work Committee was stunned. The move hasn't even started yet, and he's already preparing for it?
There was simply too much to eat. I couldn’t finish it.

What is it? Curious!
Gao Zhendong didn't know how much harm his behavior of digging a hole and not filling it had brought to his comrades here.

He is now in Factory 1201.

Yes, it is the newly established 1201 Factory. This factory was converted from an original small subordinate factory. In this way, it has land, factory buildings, and basic facilities and equipment.

When it comes to the production of computer equipment, the most troublesome parts of the supply chain, such as chips, machinery, and spare parts, are all completed in other factories. So although 1201 produces very high-end products, for the time being, it is only responsible for assembly, and the technical requirements are not high. It is just a shoveler.

Huh? Thinking of this, Gao Zhendong suddenly felt that this factory looked familiar.
He shook his head quickly. What bad luck! You must not do that.

It's okay in the short term, but in the long term, 1201 still needs to have its own technical direction and results.

For example, as a high-tech company, it is fine if a small number of patents are of the "rounded rectangular middle frame" type. However, if most of the patents are of this type, it would be ugly. Of course, the company may not necessarily die, and may even be able to thrive.

By adopting this method, this originally subordinate department-level unit was directly upgraded to the next level and became the number one factory, which made many other factories extremely jealous.

However, the managers were not so lucky. Most of them were parachuted in and did not get the chance to rise collectively.

(End of this chapter)