Chapter 748 You have it and I have it all
Regarding Gao Zhendong's behavior of being a slap in the face, Mr. Lin didn't complain at all about being ignored.
No technology is perfect and must have its flaws. On the contrary, Chief Engineer Gao can raise issues in advance, which helps them avoid or reduce this impact in design and use.
"Mr. Gao, please tell me."
Gao Zhendong scratched his fingers: "First of all, there is a problem in all ground-to-air positioning, and that is the positioning distance. It is actually the slant distance between the two. For aircraft, it is easy to say that it is far away. The error is not big. If you are close, you must take into account the height of yourself and the base station, and calculate it comprehensively to determine your actual distance.”
Hey, I thought it was a big deal, that's it? I know trigonometric functions, but Mr. Lin thinks Mr. Gao is too 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 of relays is too many, the cumulative error will be large."
This is indeed a problem. Mr. Lin muttered: "Well, it is true. We need to consider making this thing smaller and using an airplane for relay. Calculated based on the range of 550 kilometers, if it is relayed once by an airplane, it can at least be Extend the relay range to 800 kilometers. This distance should be enough, no further is necessary.”
The range of 800 kilometers from the base is actually far beyond the current and even within a certain period of time, the limit of naval activities and strike range.
"But in this case, the terminal can't know the position of the relay, right? It can't calculate its actual position."
Mr. Lin solved the problem by himself without Gao Zhendong, but his tone was not as good as Gao Zhendong: "Are you stupid? What is the simple communication function that I have been talking about for a long time used for? When the repeater responds to the ranging signal, Just send your own position to the terminal. Even if there is a cumulative error of one or two kilometers, what difference will it make to the navy and air force? "
As Gao Zhendong, who was spoiled by the global satellite positioning system in the future, he really thought that this error was quite large, but in the eyes of people these days, what the hell is this called an error?
No error! Even if the distance is a little off, it’s because I took the wrong route and it has nothing to do with the navigation system.
"In fact, for the Army, the biggest trouble is that when the terrain is complex, the navigation base station must ensure a certain height. Since the combat area is relatively fixed and the combat time is long, if it is too far from the Air Force airport, 24-hour relay support cannot be maintained in the air. There is an opportunistic method that can be used when there is no other way." Gao Zhendong added.
"Ah? Mr. Gao, tell me, tell me."
"If this system is made small enough, you can get a tethered airship or balloon and hoist it into the sky for use. However, tethering an airship or balloon itself is not easy. It is just an idea. At this stage, airborne is more realistic. . Or, if you put triangulation equipment on it, two aerostats are more reliable than a single base station aerostat.”
"Mr. Gao, why is this? Isn't this going to get worse and worse?" Even Mr. Lin didn't understand his statement and asked.
"Because the angle measurement system for single-station positioning needs to transmit signals 24 hours a day, and the signal power is not small!" Gao Zhendong said.
This is a layer of window paper, just a little bit will show through. Mr. Lin is not a fool.
"Ah, I understand. The ranging system of the response mechanism can maintain the minimum power consumption when there is no answer. The high-power reply only takes a moment. In this way, the power consumption is much smaller. If it is designed properly , battery power can be used for a while, but single-station positioning requires power supply. The weight of the power supply line and the tethering rope will bring great trouble to the development of the aerostat. ”
Gao Zhendong nodded: "Yes, that's the truth. Of course, you can also consider using high-voltage power supply to reduce the current and reduce the cross-sectional area of the power supply line. This is also a way. But in general, this is an evil way. Hahaha. It is still a bit difficult for us to be able to move the aerostat of the base station. I suggest that we should broaden our thinking. It is very troublesome to make it practical. ”
Mr. Lin actually smiled: "Mr. Gao, it's not an evil path. There is no airship. It is still possible to find a commanding height and arrange it. This is a device that can be tactically maneuvered. Moreover, there is no need to guarantee that the signal can be received in all states. , as long as it is easy to receive the signal, for example, on the ridge.”
Upon hearing this, Gao Zhendong patted his head: "Well, what you said makes sense. Finding a commanding height to set it up can ensure a certain degree of use. Even if there are multi-path propagation errors, as long as the area can be located and combined with the topography of the map You can also accurately determine your location based on the terrain. ”
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. This blind spot is not far away, but in the nearest place." Gao Zhendong said.
"The nearest place?" The comrades working on the positioning system were all lost in thought.
After thinking for a while, a comrade shouted: "I understand! Over the head! Over the head!"
Gao Zhendong nodded: "Yes, there is an inverted cone area on top of the base station with the base station as the vertex. Within this cone, the signal cannot be distinguished, and there will be problems with positioning. The vertex angle of this cone is approximately Between 120 degrees and 140 degrees, that is to say, the range from which the side of the base station is 20 to 30 degrees away from the ground is the range where the navigation system can be effective. ”
After listening to this, Mr. Lin let out a long sigh of relief. What a big deal. If there is a blind spot at a long distance, I will be blind. If there is a blind spot above my head, then it doesn't matter. Two hours later, comrades from the National Defense Work Committee, maritime equipment, air equipment, and land equipment gathered together to listen to General Lin's report.
"In other words, by learning from Comrade Gao Zhendong, are you confident in developing a 'three-five' single-base station positioning system with a positioning distance of 500 kilometers, a ranging accuracy of 500 meters, and an angle measurement accuracy of 5 degrees?" Comrade from the Air Force He spoke with joy.
"Yes, we have this confidence. In fact, according to Comrade Gao Zhendong's estimation, the limit of this system is even higher, but we took into account the technical environment and adopted a set of relatively conservative parameters."
Mr. Lin was very confident. During the report, he still laid an ambush. However, the ambush was done as soon as possible, but it could not be concealed. Otherwise, he would accidentally talk to Mr. Gao about this matter in the future. If the accounts are correct, some things can easily cause misunderstandings.
The comrades in the Air Force rubbed their little hands in excitement: "That's enough, that's enough. This set of performance is enough. As long as we can achieve this performance, all other problems are our problems, hehehehe."
The navy took a look at them, look at your potential! Then...
"In other words, if this system is fully completed, it will be able to provide positioning capabilities within a range of at least 800 kilometers, and the error will probably not exceed 3 kilometers? Right?"
Mr. Lin nodded: "Yes, the positioning and communication architecture planned by Comrade Zhendong can support this kind of application. In fact, it can go further, but in that case, the error will be even greater."
The comrades of the Marine Installation Bureau also rubbed their hands: "Hey, what do you want, 3 kilometers or 5 kilometers? They are all visual distances, visual distances."
The comrade who is pretending to be empty looks at him, look at your future!
"What about us?" The comrades from the Land Installation Bureau couldn't sit still. It's none of my business, right?
"Your situation is more complicated. You have to rely on air relays or set up navigation equipment at commanding heights to better support operations on complex terrain."
"That's good too, hahaha. It's hard to get used to it. It's good to have it. It's good to have it." The comrade of the Land Decoration Bureau showed an honest smile.
The comrades in the air uniform almost cried when they saw it. The big brother of the army was so miserable: "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 honestly.
But the good news doesn't stop there. Mr. Lin said: "Mr. Gao said that if this system can be developed, he has some application directions that everyone can use. But now the thing has not been implemented, and I don't know the specific performance." range, we have to take a break.”
Even the National Defense Working Committee was shocked. He hadn't even mentioned the horoscope yet, but he was preparing to do it again?
There was so much, I couldn’t finish it, I couldn’t finish it at all.
What exactly is it? curious! ——
Gao Zhendong didn't know how much damage his behavior of digging holes but not filling them had brought to the comrades here.
He is currently in Factory 1201.
Yes, it is the newly established 1201 Factory. This factory was directly converted from a small subordinate factory. In this way, the land, factory buildings, and basic facilities and equipment are all there.
In 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. Therefore, although 1201 produces very high-end things, in fact, for the time being, it is only responsible for assembly, and the technical content requirements Not high, just a shovel.
Huh? Thinking of this, Gao Zhendong suddenly felt that this factory always seemed familiar?
He quickly shook his head, bad luck! But 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, there is no problem if a small number of patents are for "rounded rectangular middle frame". If most of the patents are like this, it will be ugly. Of course, it is not necessarily dead. You might even be alive and well.
Using this method, this division-level unit was directly promoted to the next level and became the number one factory, which made many other factories jealous.
However, the management staff were not so lucky. Most of them were airborne and did not achieve the good news of collective ascension.
(End of chapter)