Military chips are different from civilian chips, not to mention anything else, it must at least be resistant to electromagnetic pulses, and cannot lose its role in complex interference, so it is mainly stable first.

WHEN CIVILIAN CHIPS OFTEN HAVE A FREQUENCY OF A FEW GHZ, MILITARY CHIPS ARE ONLY A FEW HUNDRED MEGABYTES, AN ORDER OF MAGNITUDE DIFFERENCE.

Military, just enough.

Therefore, Qin Feng was very surprised when he heard that he actually used a civilian 8086 processor, you know, this is a civilian processor produced by Intel!

This kind of 16-bit processor used to be quite a hot one, and it was a must-have for many computers, but now, the processor has also begun to transition to 32-bit, and the 8086 has fallen behind and is easy to buy, but it still sounds a little incredible to use it on the airborne radar.

After all, airborne radar requires floating-point computing power, which is precisely the weakness of civilian CPUs.

"Let's settle the problem first." Teacher Zhang said: "It is said that foreign countries did the same at the beginning. ”

This sentence is too rich in meaning, Qin Feng has long thought of something, he has proposed to get an AWG-9 radar from a third party before, and this kind of radar is an early model, maybe it is a civilian 8086 processor?

8086, belongs to the central processing unit, referred to as CPU, and in the later stage, this kind of CPU is subdivided into three kinds, one of which is called DSP, digital signal processor, focusing on processing digital signals, with the continuous development of airborne radar, now still use ordinary CPU, and then later, it is a special DSP, its computing power is more powerful.

For example, now, it is impossible to have a CPU with millions of floating-point processing per second, but in the nineties, there is already a dedicated DSP chip with 10 million floating-point processing per second, which makes the airborne radar a great improvement, which is much higher than the early AWG-9 and APG63 and 66.

The faster the computer can compute, the more Fourier transforms can be performed, improving radar resolution and improving the ability to filter targets from clutter.

These, Qin Feng is clear, now, what Mr. Zhang said is very simple, this is the first radar in China, first solve the problem of whether there is or not, and then say, in terms of performance, it can be slowly improved in the future.

"Let's talk about what Mr. Zhang is familiar with, how is the development of our antenna?" Qin Feng asked.

He is very concerned, radar is the eyes of fighters, the higher the performance of the radar, the brighter the eyes of fighters, and it is impossible to do no radar in air combat in the future.

"We've been working on this antenna." Mr. Zhang said: "Actually, we studied the flat panel slot antenna in the JL-2A at the end of the 50s, because the processing capacity was not good at that time, we used the ground radar that uses multiple individual waveguides to weld and splice the antenna to a plane. The yield rate is too low, the cost is high, and the performance is unstable, so it is abandoned. ”

This principle is not difficult, ground radar has been used for a long time, but ground radar is big, many of them are meter-wave radars, and the accuracy requirements are not high, but the radar of the carrier aircraft is different.

If you can't solve the problem of processing, everything will be impossible.

"We have thought of a lot of ways for this process." Mr. Zhang said: "If you want to improve the processing accuracy, you must use CNC machining, even if it is a fixture used in processing, you must also use a clamping method that combines high-precision vacuum adsorption and magnetic suction. ”

Without CNC machine tools, it is impossible to achieve this kind of precision processing, even when entering the CNC machine tool processing, how to clamp this thin plate, is definitely a technical job.

Now it is just the mid-eighties, the domestic CNC machine tools are quite few, it is difficult to find the right processing machine tools, fortunately, there is one in Chengdu, which is also the reason why Mr. Zhang is often here.

"In addition, in the assembly, we planned to use the gluing process, but the mechanical strength and conductivity of this process could not be satisfied, so we planned to use the salt bath brazing process." Mr. Zhang said: "This process, we have several units in China to use, but it can't meet our precision requirements, so I led the team to overcome this difficulty and research out the welding process that meets our needs." ”

In the past, Qin Feng only knew the general form of this antenna, but no one knew how to do this antenna, and China was also crossing the river by feeling the stones, and it was absolutely impossible to import the processing technology of this antenna from abroad.

Just look at Spey, when it was imported, it was said that all the patents were introduced, but what was the result? Specifically, the British side has to say that it also involves third-party patents, and if you want certain technologies, you have to spend more money.

This is still a backward Spey engine, if it is advanced technology, then the other party's restrictions must be greater.

You can get the whole machine, for example, you are now discussing the avionics of the J-7 CP from the Eagle Country, but if you want to get the processing technology, then don't dream.

Key technologies cannot be relied on by waiting, nor by buying, but only by self-development.

This is the experience that has finally been summed up after many losses.

"Teacher Zhang, this is really professional." Qin Feng said: "I really hope we can get this kind of radar out as soon as possible." ”

"Well, if you have time to go to Nanjing in the future, you can go to our 14 institutes." Mr. Zhang said: "This project is the most important project of our institute, everyone is working hard, and everyone hopes to make it themselves as soon as possible." ”

The watermelons had all been eaten, and at this time, even the other students gathered around Teacher Zhang and listened to her.

"Radar, is the eyes of the fighter, without advanced radar, the fighter is a blind man, now our domestic J-8, is facing such a situation, the body has, but there is no radar, we as radar scientific research workers, is to work hard to study, to fill the gap in the motherland's national defense, so that our 1471 radar as soon as possible, as soon as possible to achieve a breakthrough of zero on the airborne pulse Doppler radar, and then, on this radar, we continue to progress, we can continue to engage in 1472, 1473, or even 1491, continue to improve, and finally reach the world's advanced level, this is the mission given to us by history, for the sake of the motherland's aviation industry, no matter how heavy the burden on our shoulders, we must continue to go on! ”

"Teacher Zhang, what you said is so good." Qin Xue said: "Although I have just joined in, I also hope to contribute to our project!" ”

Qin Xue was also moved.