Chapter 543: The difficulty of radar

These are already quite professional knowledge. The specific things are too complicated. In simple terms, analog-to-digital conversion mainly performs digital radar sampling.
For example, the AN/AWG-9 radar used on Eagle America’s Tomcat fighter aircraft was developed too early, its analog-to-digital conversion capability was low, and the sampling rate was low, so it only had a low repetition frequency and a medium repetition frequency. In the early 1980s, The emergence of high-speed and high-frequency analog-to-digital conversion chips resulted in the first full-waveform PD radar.
In the 1990s, the level of analog-to-digital conversion has increased by more than 10 times. The sampling rate of the new generation of radars such as RDY, APG71, and 73 has been greatly improved compared with the previous APG63, 69. The previously unclear targets can be seen clearly. The signals that cannot be retrieved from the clutter can be retrieved. The level of down-view and the anti-interference level are greatly improved, and the ability to retrieve targets from weak signals and interference signals is also doubled.
As for the other difficulty, the digital processor. In the 1980s, it was a fantasy to make a CPU with millions of floating point processing per second. In the mid-1990s, the RDY radar of Ji Guo had 10 million floating points per second. The processing has greatly increased the performance of the PD radar, which is far better than the APG63, 66, 68 of Eagle Country in the early 1980s.
However, the Han Guo radar matured after 2000, and the CPU and DSP, which calculate 1 billion times per second, have changed the performance of the radar.
The high-speed computing capability allows the radar computer to perform a large number of repeated fast Fourier transform operations, which not only greatly improves the radar resolution, but also greatly improves the ability to extract targets from clutter.
This data processor is very different from a civilian CPU. If it is scientifically named, it should be called a DSP chip. At the same time, it can also be used in many ways. Its upgraded and replaced version is a more advanced FPGA. Compared to civilian CPUs, they focus on floating-point operations.
In later generations, there are many irresponsible editors who casually contemplate various articles. The domestic Huarui No. 1 DSP chip came out and shouted there. Since then, the shortcoming of my country’s military aircraft chips being restricted by foreign countries has ended. Military aircraft use domestic cores, national defense security is guaranteed, and so on.
This is pure nonsense. In the research and development of military aircraft, chips have always been produced on their own. It is absolutely impossible to import from abroad. What other editors are imagining, because the Eagle country refuses to export, and it is carried out on Han. The arms embargo was obtained secretly from a third country.
Isn’t this nonsense to build the country’s military industry on a foreign basis? If you only talk about military aircraft, the scale of a few hundred is not big, but this thing is not only used on military aircraft, as long as it is a radar, like later air defense ships, a phased array radar is a few hundred. Using chips for a piece of land, can you easily import hundreds of pieces of land from a warehouse in a third country?
Military aircraft’s chips have always been autonomous, it’s just a performance issue. If this kind of thing needs to be imported from abroad, it will definitely get stuck at any time, and if the chip has a back door or something, it’s even more. Terrible.
The civilian chips in Han may be weak, but in military aircraft chips, they have always been made by themselves. How can they be reliable if they depend on foreign countries?
The main developer of military aircraft chips is the 114 in front of them. After disassembling the advanced radar and using discrete components first, they found that this was impossible. So, they were forced to start working on the chips and produced various The chip comes.
Now, they are walking this road. Fortunately, they now have Qin Guan.
"In other words, what we lack most now is the chip." Qin Guan said: "If the chip breaks through, then there is hope for our pulse Doppler radar?"
In this era, Han Guo can't even get an inverted radar, but now, it will leap over to pulse Doppler radar in one step. What a huge progress this will be!
Qin Guan had already been stimulated when he was in the holy country, so regardless of whether he could get it from abroad, in short, let him do it first!
Looking at the history of later generations, the electronic system is better to overcome than the engine. The later Han country has overcome the difficulties of active phased array radar, but the engine is still a huge shortcoming.
Now that he lacks the chip, he will simply get the chip out. Now Qin Guan already has sufficient confidence.
The two exchanged models are all prototypes, using technology from the early 1990s. In the early 1990s, Han Guo only used a 1 micron process. Our existing production line is Fully satisfying.
Again, in terms of military products, there is no need for technological advancement, but various indicators of resistance to electromagnetic pulses.
Just say what chip is lacking and name it, and you can go to the weapon data cemetery to look up the model information, and then hand it over to the 1109 factory for production. It's that simple.
This super weapon exchange system is too big to open.
The current imitation object belongs to the early batch of 11473. Historically, it was developed at the end of the 1980s. The components used were relatively old and the performance was relatively backward. At that time, the radar was only equivalent to the level of the Eagle Country in the early 1980s.
In other words, if it is done by its own side now, it happens to be at the same level as the Eagle Country in the early 1980s, and stands on the same starting line.
It doesn't have to be too much. It's not bad to stand on the same starting line for now.
Suddenly, Qin Guan thought of something again. It's not right. In addition to these circuits, the development of radar antennas seems to be a difficulty!
Xiong Guo has been working hard for many years, but he can’t handle this kind of radar. One of the key reasons is that the flat-slit radar antenna requires too high processing technology and cannot be reached at all. So they have been working on it for a long time. Array control radar.
Now, just getting a breakthrough in the circuit, it will not be able to deal with radar, radar antenna, it is also a huge difficulty.
"How do you plan to solve the radar antenna problem?" Qin Guan asked.
The question raised by Qin Guan finally convinced the people present. Qin Guan is definitely an expert. Only an expert can be stunned and raise the most critical questions at once. That's right, except for the circuit. , This kind of radar antenna is also a huge difficulty.
How to solve this difficulty?
"The radar antenna is in charge of Zhang Gong." Chief designer Wei of the fire control radar said: "She is not in the research institute now. If you want to process this radar antenna, you must use CNC machining and chemical milling to remove it. Cutting burrs, so she searched all over the country and found that the northern heavy-duty truck factory with the highest numerical control processing, so she went on a business trip to the northern heavy-duty truck factory and wanted to go there to request assistance in processing."