Hu Wenhaizai carefully read the plan of the aerospace system and had a good idea of the technology in it. Pen & Fun & Pavilion www.biquge.info make a whole page of wafer CCD chips, and it is the first time for him to encounter this kind of requirement.

Looking at the data presented in the proposal, although the new technology wafer fab will be a little troublesome, it is by no means completely impossible. Some modifications and technical updates are carried out on the existing equipment, and it is fully capable of manufacturing CCD chips that meet the requirements.

In terms of technology, for the time being, CCD, the biggest obstacle to the digital transmission of agricultural census satellites, can be regarded as having been solved.

However, there are still many areas to be tackled in this project, and the trade-offs of some of these technical indicators are also very important.

"The problem of CCD chips is the most important, and I will ask Ni Guangnan and Lu Yinglong to confirm this later. But as far as I know, it's no problem. ”

Hu Wenhai put the plan back in his hand, Li Xu hurriedly took the documents over, and then took out a file bag in his leather bag and put the documents back. Looking at his appearance, it is obvious that the level of secrecy of this information will not be low at all.

However, for Hu Wenhai, some of the data and technology in this document are still conservative. He stood up in the reception room, turned his head and retrieved a piece of paper and pen from the bookshelf behind him, and began to write and draw on the paper.

"Advances in CCD technology seem unlikely anytime soon, and the next generation of consumer-grade technology will take at least a decade to develop. On the other hand, the process technology of chips is constantly improving. According to Moore's Law, the number of transistors in a chip doubles every eighteen months. Your plan based on the current state of the art is still a bit too conservative. ”

Hu Wenhai said and stood up the paper that he had painted in his hand, and there was a rather clumsy graffiti on it, which did not look much different from the drawings of kindergarten children.

"And the line scan technology you've planned is outdated, and now there's more advanced new technology available in the new academy. With the application of this new technology, the resolution of agricultural census satellites can be increased by a further three to five times. ”

It's not that Hu Wenhai is unpredictable, but that he is thinking about doing "bad things".

One of the most important technical indicators for the future digital camera market is "resolution". For ordinary people, things like aperture, shutter or zoom are incomprehensible. The performance of a digital camera is good, mainly by looking at the number "resolution".

A 20 million pixel digital camera is better than 8 million, even if you can shoot night scenes, have a high signal-to-noise ratio, and have strong color reproduction ability, but in the eyes of ordinary people, the photos taken by my camera are large!

Of course, with the increasing popularity of digital camera technology, people have also begun to pay attention to other technical indicators. But when it comes to choosing a digital camera, resolution is still one of the most important selling points.

Mr. Hu is very happy about the technology tree with crooked competitors.

When it comes to the pursuit of resolution, the line array is undoubtedly a great advantage over the area array.

To put it simply, there are two types of chip states for CCD, one is a sensor with only one line. By moving the position of the sensor, the entire image is scanned. The other is a flat sensor that does not need to be moved to capture the image.

Both technologies have their own advantages and disadvantages, and line arrays are generally used in faxes, scanners, barcode guns and other products with low aging requirements. Although the area array is mainly used in consumer-grade digital cameras, it is the product with the highest profit margin.

If we can lead the technical route of digital camera companies such as Nikon and Canon, we will undoubtedly be able to gain more opportunities and time for new scientific research and development of digital cameras.

Hu Wenhai's "bad water" hit the heads of the face array and the line array.

Consumers are actually very easy to "fool", especially the concept of a certain product in the promotion stage, which is more likely to be infinitely toxic. For example, in order to promote the market, PHS came up with the concept that mobile phones have greater radiation and are harmful to human health. At that time, it did make great contributions to the promotion of PHS, but PHS disappeared from the market, and people who believe that mobile phone signal radiation causes cancer still believe in it.

When the digital camera technology matures, Xinke can open a vest and sell line scan digital cameras at a very low price in the market. Compared with the inferior resolution of contemporaries, the resolution of line scan cameras is enough to occupy the inherent impression of consumers.

If a digital camera that was first put on the market used a line array, it was not friendly to moving images. The bias that digital cameras are not suitable for shooting moving images will surely make digital camera manufacturers scratch their heads.

There are similar cases where LCD TVs are not suitable for playing sports pictures, and this bias almost strangled LCD TVs. If Panasonic is not willing to share the plasma TV market with others, how can there be an opportunity for LCD TVs?

It took ten years for LCD TVs to catch up with the level of plasma TVs in those years. However, even if the problem of the unsmooth motion picture of the LCD TV is gone, the LCD TV manufacturer still has a lingering desire to advertise over and over again how much its response time has improved. The defects of a promotion stage back then have become a nightmare that TV manufacturers can't get rid of.

It is impossible for area array CCD to catch up with the line array in terms of resolution level, and Hu Wenhai is even less likely to self-destruct like Panasonic, and when the time comes, Nikon and Canon will either give up the digital camera project, or they will have to figure out how to speed up the line array.

And the technical route of the latter is properly a crooked technology tree.

When Xinke cultivates a domestic enterprise whose technical level is not inferior to that of Canon Nikon, the technical route of the line array will be abolished. Everyone returns to the face line and races on the same starting line, will the domestic camera be worse than the imported camera?

Based on this consideration, Hu Wenhai opened such a project at the Academy of New Sciences, the purpose of which is to make the resolution of the linear array reach a point where the surface array can be desperate.

Hu Wenhai pointed to the rough schematic diagram on the paper and explained it simply.

"We know that digital images are different from analog signals in that they are obtained by discretizing continuous signals from nature. When humans look at digital images, they feel like they are a whole, but they are actually made up of solid-color pixels. The acquisition of these pixels depends on the photoelectric coupling device on the CCD chip. ”

Hu Wenhai said that these are all basic knowledge, and several people in the reception room nodded one after another, and there was no obstacle to understanding this.

"However, due to the limited processing accuracy, our sensor does not fill the entire chip at the microscopic scale. Today, we produce line array chips with a 18-micron spacing between two sensors, with a lot of space between each two adjacent sensors. Our sub-pixel scanning technology fills up the space between the sensor in a simple way. ”

"How did this come about?" Director Zhao of the Commission of Science, Technology and Industry for National Defense widened his eyes and shook his head like a rattle: "This is impossible, this is theoretically impossible! It's not that there is nothing between the image sensors, and your CCD chips don't need other functions except for the image sensors?"

Of course, this is not possible, and in addition to the photosensitive function, the CCD chip also needs many different transistor functions such as signal processing, storage, and transmission time-sharing, which all occupy valuable space on the CCD chip.

Hu Wenhai wants to fill this part of the space, so where will the other functions be placed?

"Absolutely, but we didn't have the space to make the most of the time margin for line scanning. ”

Hu Wenhai took a pen and staggered the side and downward of a line representing an image sensor on the paper, and drew a vertical column of image sensors. Then, next to this vertical column of sensors, continue to stagger the two positions, and draw another column of sensors.

Until the end, the array of photoreceptors on the paper became a parallelogram. At this time, Hu Wenhai drew two horizontal lines on the paper and cut a rectangle from the middle of the parallelogram. The width of the rectangle is the distance between the two sensors in the first column. At this distance, an image sensor can be found on each column.

"That's our solution, sub-pixel technology. A linear CCD implemented with area array CCD technology. In the entire subpixel area array CCD, adjacent misalignment scan line data can be inserted into the first column of scan data. The resulting scan results are three to five times higher than the conservative estimate of the resolution of a linear CCD alone. If the chip process technology continues to develop, it is not impossible to do ten or twenty times more than the ordinary line array. ”

"...... like this"

Several technical officials in the reception room couldn't help but exchange their views on the implementation of this technology.

Strange to say, subpixel technology is not a difficult technology, it is purely a matter of thinking. Similar to IGCT and PCR technology, they all belong to the kind of genius who pierces the window paper and is mediocre.

Subpixel isn't a difficult technology to understand, and it's not difficult to implement. After a brief discussion, they determined that the technology was feasible. In this way, its strategic value cannot be measured by a simple agricultural census satellite.

In this way, the chip process technology will be updated about three times, the wafer area will be expanded again, and the satellites in space will not be a problem to read the newspapers in the hands of people on the ground. Is it true that the Ministry of Agriculture is going to use such technology for agricultural census and to "defend the country and the Ministry of Agriculture" in the future?

Of course, this is a joke, but if this technology can be realized, then the president of the United States will have to be a little more careful in the future. It's best to have the curtains on the glass windows of the Oval Office at all times, and don't look at classified documents in broad daylight when you're outside. Military bases and nuclear counterattack silos around the world had better be camouflaged a little more finely, otherwise it would be no different from running naked.

Imagine that at the stage when this technology was still secret, we first scanned the earth. All the nuclear missile bases in the world have nothing to hide, and there is simply nothing that cannot be done if there are any diplomatic negotiations to throw out this information.

This kind of technology is no longer a matter of money, even if it does not earn a penny, the state will tighten its belt. If you really want to say, the results that can be achieved by subpixel technology are probably no smaller than those of the atomic bomb. The point is that it provides China with a technological time lag to achieve a fairly high-resolution satellite reconnaissance capability at a time when other countries are completely unaware of this.

Ten years later, CCD technology will generally evolve to this resolution, and countries will naturally upgrade their intelligence secrecy work accordingly. Even if your satellites can see human hairs, don't try to discover the enemy's military deployment intelligence on the premise of deliberate camouflage. It's like a beautiful woman seeing that Lao Wang next door bought a pair of binoculars, no matter what he wants to do, he must close the curtains when he takes a bath.

All the technical officials here, you look at me, I look at you, and no one thought that things would develop like this. It is said that Hu Wenhai is a treasure trove, hiding countless treasures. Now it seems that selling the aviation system and exchanging such a technology for aerospace is completely worth the ticket price!

Secretary Qian of the Science and Technology Committee of the Ministry of Aviation Industry fidgeted and moved his buttocks, and asked worriedly: "Mr. Hu, I don't know if this technology can be put into application now?"

"Of course. ”

Hu Wenhai nodded proudly and said with a smile: "This simple technology can be made by randomly pulling out an IC design team in the electronics institute." ”

"Wait, any team?"

Secretary Huang stood up violently when he heard this, frowned, and said, "Mr. Hu, who is involved in your technology research and development team?"

Hu Wenhai was stunned for a moment: "The specific situation was handled by Dean Ni, and I just told the people below about my thoughts." I don't know exactly who is involved. ”

"In this way, Secretary Huang, I suggest that you report to the chief immediately. Director Zhao of the Commission of Science, Technology and Industry for National Defense also realized the problem and hurriedly stood up: "If the situation allows, I think the project should be set to top secret immediately, and the relevant personnel should control it first and strictly pass the test." Any leak of intelligence will be devastating to us!"

"I agree. ”

Secretary Huang simply turned his head to look at Hu Wenhai, and said in a deep voice: "Mr. Hu, I have to borrow your confidential line here." ”

"Oh, yes. Without waiting for Hu Wenhai to answer, he snatched the piece of paper full of clumsy graffiti from his hand with a snap, and said righteously: "From now on, this paper is also a confidential document." ”

"Vice President Li, please take it. ”

Li Xu carefully folded the white paper in half, then took out an envelope from his leather bag, stuffed it in, and tucked it into the front breast pocket of his shirt.