Siheyuan: I eat melons while doing scientific research

Chapter 1093 "Sky Gym" (only 4k today, to be replenished within the month)
"Need to change it further?" The comrades felt that this thing was already very good.

Gao Zhendong nodded: "In terms of the overall architecture, the medium-speed communication equipment is a single channel. As a military device, redundancy must be considered from the beginning. The structure must be fixed. It must have at least two channels, taking into account the main and backup issues."

It’s not that Gao Zhendong is making a fuss, but that 1553B is determined this way.

He added: "Industrial medium-speed communication equipment is non-isolated. Even after integration, if you want to use it in the worst environment, you need to add isolation measures and use isolation transformers to isolate the bus from each node, so that electrical faults at each node are not easy to crosstalk to other places."

These little tips and technical details can be said to be basic operations in the future, but these days some people know them and some don’t.

If we look at the technical comrades today from the perspective of decades later, we will feel that they don't even know some basic common sense. In fact, this is a bit unfair. The main reason is that there is really no one to teach them, and they have to accumulate knowledge bit by bit.

This is also the reason why Gao Zhendong's electromagnetic compatibility design guide for equipment was regarded as a treasure by his colleagues working in related fields, and now it has even become a professional technical textbook for related majors.

However, many lessons learned are not something that can be easily learned. If no one points them out directly, it is only when the conditions are met that we can realize them once we encounter them. By the time we have accumulated a lot of experience, decades have passed.

Even so, we can truly overcome this hurdle only if scientific research becomes systematic and uninterrupted, and if there are continuous and continuous engineering and technical personnel being educated and engaging in these technical work.

Whether it is technology or manufacturing, once there is a gap, and the gap lasts for more than 10, 20 or 30 years, it will be extremely difficult to pick it up again.

After hearing what Gao Zhendong said, the comrades remembered that Chief Engineer Gao said that the thing was for "industrial" use, but did not say it was for military use. Military use would more or less require some improvements.

"But if we quarantine, won't the cost be too high?" a comrade from the Military Communications Institute asked. I'm not trying to argue, but I just want to learn more.

Gao Zhendong shook his head: "It's not big, and it's worth it. In addition, the isolation transformer used for isolation has another advantage. The isolation transformer is actually a coupling transformer. In this way, as long as the distance between the node and the coupling transformer is not too far, the signal after coupling can be transmitted for hundreds of meters or even longer distances. The coupling transformer can increase the transmission voltage after coupling."

The output level of 1553B can be as high as 27V, which is much higher than 485. As for such a high transmission voltage, it seems that the transmission distance is not as long as 485. In fact, the main reason is that it needs to achieve higher transmission rate and transmission reliability than 485.

Anyone who has studied Shannon... no, Shannon's theorem and related communication principles knows that you cannot have both of these and you have to choose one.

At this point, Gao Zhendong added: "And the speed of this thing is too slow, 19200bps. We also have to consider the communication distance. If it is too far away, it cannot reach this speed. It is not enough. Don't think it is very fast now and it is completely unusable. In fact, with the popularization of digital technology and the improvement of requirements, this speed is not enough."

At this point, Gao Zhendong recalled the classic 640k memory joke of Juying Boss.

The chief engineer of the Defense Work Committee was very curious: "Then how big do you think it should be?"

Gao Zhendong smiled and said, "I think at least 1Mbps is needed to meet the needs within a certain period of time, and the transmission distance must reach a maximum of 300 meters."

This is not just something Gao Zhendong said nonsense or a decision made on a whim. It’s still the old saying - Citibank is carefully selected and trustworthy.

The 1553B data bus, which Citigroup has not yet developed, has this speed.

When the comrades heard this, they immediately turned their attention from the medium-speed industrial communication device to the network card. So the real target was waiting here?
"Use the network card to modify it?" said a comrade from the Military Communications Institute.

Gao Zhendong still shook his head: "No, there is a problem with the network card. The functions are too complicated and unnecessary. I have already considered it. As for how to change it, I already have a set of basic results. I called everyone together to see if everyone thinks there is no problem. I will bring out this set of results. Everyone will work together to realize this set of things."

Gao Zhendong even has the original 1553B standard, but it is not the domestic GJB, but the Citigroup's MIL-STD-1553B.

高振东不准备从1973年的1553到1975年的1553A再到1978年的1553B这么一步一步来，而是准备一步到位，直接上1553B。

The biggest reason is that 1553B is the complete version, so there is no need to compete with 1553 and 1553A. The main contents of 1553 are divided into two parts: hardware specifications and software definition. The software definition can be used directly. As for the hardware specifications, it can be defined first. It doesn't matter if 1Mbps cannot be achieved for the time being.

However, judging from the technology Gao Zhendong had at hand at the time, there was actually no problem with the hardware specifications. It was just 1Mbps@300 meters, so it was easy to say. The same hardware specifications did not mean the same hardware structure and technology. As long as the requirements could be met and it met the standards in terms of reliability, availability and maintainability, there would be no problem.

Don't underestimate 1553B. It was nominally prepared for aircraft and the publisher was also an aviation-related committee. In fact, it was later widely used in aviation, aerospace, electronics, automobiles, ships, satellites, missiles and other fields. It is a de facto equipment data bus standard.

As for the later 1773, it has already reached the field of optical communications, which is completely beyond the current demand, and the step is indeed a bit big, which may easily lead to something wrong.

The more the comrades thought about it, the more they felt that Gao Zhendong's suggestion was brilliant.

"Well, Chief Engineer Gao's suggestion is ahead of the times."

"Yes, although the problem is not prominent now, it has already begun to emerge. If we can prepare the solution in advance, it will basically be used when we find that the problem is serious."

"You are the first to see the clue, but I am almost in a hurry here! This thing is good, it can solve the problem once and for all." There is no need to ask, this person is definitely a comrade who is engaged in aircraft work.

"You are in a hurry to burn your eyebrows. My eyebrows are burnt off. You don't know how many strange things need to be received on a ship, and how diverse they are."

"..."

The comrades were discussing very heatedly, and Gao Zhendong had to work very hard to hold back from laughing out loud. There was no other reason but that compared to airplanes, the problems faced by combat ships were indeed more serious.

Just think about the large number of air-to-air and anti-sea weapons on the 062 escort boat, as well as their control systems, electronic equipment, and the ship's own electromechanical systems, and you will know what kind of situation they are facing.

Of course, you can also use analog access, or even no access at all, but if you do this, either the function is missing, the cost is high and the system is complicated, or you have to give up some of the benefits of the digital system, and it is also difficult to integrate the equipment into a combat command system. The integration of heterogeneous analog equipment is much more difficult than that of digital systems, and the effect is not necessarily good.

"Well, in this way, the difficulty of equipment integration will be reduced, and the price to pay is nothing more than that some related equipment may need to undergo analog-to-digital conversion, and all equipment will require at least a simple digital processor and communication equipment. But I think the price is worth it!" The chief engineer of the Defense Work Committee made the final decision. This matter is worth it!

After saying this, he turned to Gao Zhendong and said, "Comrade Zhendong, you can say that you have anticipated the enemy's moves. No, that's not the enemy. It should be said that you are preparing for a rainy day." As the chief engineer of the National Defense Committee, he chose his words very carefully, with a feeling of "calculation".

Gao Zhendong smiled and said, "I have more time, so I can think more."

This sentence made all the comrades breathe harder. Chief Engineer Gao was good in every way except that he showed off all of a sudden, which was really unbearable. The key point was that he himself was completely unaware of it.

Considering the number of his achievements and the intensity of his work, it is amazing that he can still say “I have plenty of time”!
Gao Zhendong himself was indeed unaware of anything and was still discussing work.

"If there is no problem, I will send the preliminary results of my consideration to the committee and ask the committee to be responsible for organizing the implementation. I will leave it alone."

The chief engineer of the Defense Work Committee said, "Aren't you going to follow behind?"

Gao Zhendong shook his head: "No need to follow, I can basically design the transmission equipment and formulate the software protocol. As for the basic software implementation, I'll leave it to you comrades. I don't have that much time."

The main content is to translate MIL-STD-1553B. The transmission equipment has the foundation of the previous two communication equipment, so it is not difficult. The core part is mainly to do subtraction.

What he meant sounded like "I've prepared the meal, you just eat", but he had to make an excuse that he didn't have time. He really made his comrades cry.

Didn't you just say you had plenty of time? How come you don't have time now?
The chief engineer nodded upon hearing this and said: "Okay, then I will take my comrades to pick peaches!" He directly defined his next job as "picking peaches", because he knew very well that since Gao Zhendong said so, his design must be very complete!
Watching Gao Zhendong talking freely and completing the promotion and establishment of a complex subject while chatting and laughing, Lin Lianwei and Su Weihua looked at each other and thought, this old classmate is incomparable!

Considering that he had already completed the main design before the project was even launched, it makes him seem even more inhuman.

Forget it, the gods live their lives like gods, and we are just ordinary outstanding talents, so we just need to do ordinary people’s things.

As soon as the matter was settled, Gao Zhendong made another arrangement: "Well, this matter has been settled, then other comrades can leave, but comrades who are engaged in aircraft overall and aircraft control related work please stay. By the way, Lian Wei, Wei Hua, you go find Director Gao, and wait for me with Chongli for a while."

Still staying? One meeting was divided into three, the levels were gradually reduced, and it was quite economical. However, it was not easy for comrades to come here, and this was also the norm for meetings these days. If there was something to say, it should be said all at once, otherwise it would be unknown when we could gather together next time.

This time, even the Military Communications Institute was not left behind, and the target was very clear, the plane. I wonder what Chief Engineer Gao was thinking on the plane.

The comrades who were not called to stay left the meeting room with satisfied expressions. Although the meeting was not long, it lasted only half a day in total, but the gains were very rich. It can be said that many of their current problems and possible obstacles in the future were directly solved.

When the comrades had left and only the comrades related to the aircraft and the chief engineer of the Defense Work Committee were left, Gao Zhendong brought out a basic technology on the aircraft, which was also the first "killer application" of the 1553B digital bus on the aircraft.

"Comrades, I'm sorry for keeping you until the end and wasting everyone's time." Gao Zhendong apologized first. This group of comrades was the most miserable. Every time they were mentally prepared to adjourn the meeting, they would find themselves kept back again.

The comrades all laughed.

"No delay, no delay."

"If it's this kind of delay, I'd like to be delayed here every day."

"..."

The chief engineer smiled and said, "Okay, you know your comrades, they would like to keep you in detention every day. Tell me, what did you think on the plane?"

He was very happy, as he had a hunch that what Gao Zhendong was going to promote this time would affect the entire aircraft industry.

This can be seen from the fact that he kept all the comrades of different models.

Gao Zhendong nodded: "Yes, this time, I want to use the military equipment data bus technology I just introduced to perform a major operation on the plane. Of course, it can be done without this bus, but this bus can achieve full digitalization of this technology in one step, laying the most solid foundation for its extensive application in the future."

His words were a bit exaggerated. All comrades, including the chief engineer of the Defense Work Committee, were looking forward to it. It was a "major operation". As everyone knows, if Comrade Zhendong says it is new, it must be new, and if he says it is big, it will definitely be big!
But what is it that can affect almost all the aircraft types present? Comrades could not imagine that even for core subsystems such as engines and radars, the needs of these comrades are different, and some comrades even do not need radars.

The chief engineer of the Defense Work Committee was the first to be unable to hold back: "Zhendong, what surgery are you going to perform?"

Gao Zhendong smiled and said, "Comrades, do you feel that the aircraft is very difficult to operate and the response is very slow? In addition, the layout of the aircraft control system is very expensive and imposes many restrictions on the aircraft body?"

At this point, he thought of the famous "sky gym" in later generations, and his smile became even brighter.

After he mentioned this, his comrades felt that this approach was truly brilliant!
No aircraft can do without a control system. Even a glider that doesn't need an engine or a radar cannot do without it. Of course, people just don't want to pay too much for it.

Everyone looked at each other and nodded. What Chief Engineer Gao said was absolutely correct.

(End of this chapter)