"Well, this suggestion of yours is very good. Zhu Ronghua nodded and said: "It is indeed necessary to pay attention to this aspect of work. ”

The next day, Yang Jie also rushed to the R&D building of Huaxia Satellite Communications Co., Ltd.

In a laboratory, Yang Jie also saw a huge satellite placed in the dust-free workshop, which is the Dongfanghong No. 3 medium-sized communication satellite developed by the Space Technology Research Institute under the aerospace group, weighing more than two tons, carrying a payload capacity of 200 kilograms, solar wing output power of 1800 watts, loading 24 lieutenant colonel power transponders is a very mature platform, and the overall technical level is close to the level of the eighties of the last century.

For this platform, Yang Jie spent 120 million to get it, but it is already very cost-effective.

"Yang Shao, the technical drawings of the solar cells we designed with gallium nitride materials have come out, and are now tape-out, and it is estimated that it will come out next week, theoretically speaking, the photoelectric conversion efficiency of gallium nitride solar energy can reach 74 percent, which is three times higher than the conversion efficiency of solar cells using gallium arsenide, and our satellites can get more energy. ”

Xu Ke, the chief scientist of the laboratory who accompanied Yang Jie, said excitedly to Yang Jie that this time he also resigned from the Institute of Space Technology and entered Huaxia Satellite Communications Co., Ltd. as the chief designer of satellite research and development.

Yang Jie nodded: "Motorola launched the Iridium program in the mass of about 670 kilograms, the power of 1200 watts, I hope that the power of the platform we developed can reach at least 3600 watts, at least 30 signal transponders, data throughput of more than 100g, become the world's first full W-band large-scale broadband communication satellite, one can cover most of China, less than ten satellites in one orbit can meet uninterrupted data transmission." ”

Xu Ke nodded and said: "Yang Shao, if it weren't for Huaxing Group's strength in gallium nitride materials and microwave communication transmission technology, it would be too difficult to meet your requirements." ”

Yang Jie said with a smile: "Huaxing Group has to invest so much R&D funds every year, and it always has to come up with some technical achievements." ”

Huaxing Group's R&D expenditure last year even exceeded more than 15 billion US dollars, especially a lot of technology R&D direction is in accordance with Yang Jie's direction, the purpose is very strong, so many R&D funds, so many R&D personnel are actually tackling key problems in some specific technical fields, and the effect is naturally surprisingly good.

Yang Jie was relatively conservative when he showed the military this low-orbit communication satellite plan, but now that a new company has been established and the personnel are basically in place, Yang Jie naturally wants to make use of the most advanced communication technology that Huaxing Group has mastered.

There are very few domestic communication satellites in the high-frequency band, but Huaxing Group has long carried out various studies on this, and now the country has opened the door for Huaxing Group Company, Yang Jie naturally wants to throw off his arms and make a big move on this, and really put a "big satellite" out.

Xu Ke heard Yang Jie's words, his heart is also a little enthusiastic, his new boss is ambitious in the field of satellite communications, and not bad money, and the technical strength of the group company is also very strong, the entire group company is now more than 80,000 R & D personnel alone, such a huge R & D team has exceeded the R & D personnel owned by many foreign giant companies, basically absorbing the domestic technical elite into the company.

With such strong technical support, Xu Ke also believes that the research and development progress of satellites will become very fast, and if the developed low-orbit communication satellite can be successful, then this satellite communication network can be established soon.

After the completion of such a communication satellite network and ground system with a data throughput of up to 100G, it can realize fast and cost-effective satellite broadband services. The new system can simultaneously provide high-speed internet service to a wide range of residential users, professional broadband connectivity for business users, and mobile broadband services for media, military, commercial and government agencies.

Broadband services such as high-speed satellite internet can be provided to more than 1 million domestic users, especially households and small businesses living in areas lacking terrestrial broadband network facilities. The maximum speed of Internet download is at least 10M, and the maximum upload speed can be 4M or more.

In addition to broadband internet services, broadband satellite systems can also provide wireless broadband connectivity services to passengers on airplanes and trains, among other things.

In particular, military use is of great significance, the military can achieve the transmission of full-motion high-definition video and high-resolution images and the sharing of real-time data with such a high-bandwidth communication network, and grasp first-hand information at any time.

However, according to the idea of his own boss, even if these more than 20 small satellites are to be put into orbit in the way of one arrow and multiple satellites, they need to happen at least five times, and the launch cost alone will need more than 300 million US dollars, and the cost of such a small satellite is estimated to be no less than 2 million US dollars, plus the research and development funds and the construction of ground facilities, as well as the production line of satellite terminals, the total investment is estimated to be no less than 500 million US dollars, and if there is a launch failure or satellite problems in the middle, it is estimated that the investment will be 780 million US dollars.

Xu Ke was originally a member of the system, and the state has always made small money do big things in terms of funding, but he was still a little worried, so he mentioned these problems to Yang Jie.

"Don't worry about the funding, the only thing you have to do is how to scientifically and reasonably improve the research and development time of the satellite, I hope to trial produce our company's first satellite within two years, and launch it as soon as possible for in-orbit testing. ”

Seeing Yang Jie's determined expression, Xu Ke also nodded, since his new boss is so willing to spend money, then do it desperately according to the boss's wishes!

Yang Jie also rushed back to Yuetai City after inspecting Huaxia Satellite Communications Co., Ltd., and he rushed to the GaN Materials R&D Center as soon as possible.

The production line of the GaN material R&D center is also taped out of GaN solar cells, and the cut cells are sputtered with a layer of reflective film shining with a blue luster, which looks very beautiful.

"What is the yield of this gallium nitride solar cell?" Yang Jie asked Tong Jianwei, chief scientist of the R&D center.

"Because we have improved the process, the yield rate of tape-out can reach 45 percent, and if it is mass-produced, it can be increased to more than 60 percent. Tong Jianwei said with a smile.

"That's really good. Yang Jie nodded with a smile.

In fact, a few years ago, there was a laboratory in the United States that prepared gallium nitride transistors with gallium nitride materials, but the material properties of gallium nitride are different from those of previous semiconductor materials, and gallium nitride transistors will crack when the expansion coefficient of silicon genes is different from that of ion implantation and annealing.

However, Yang Jie directly asked the following scientists to develop gallium nitride crystal rods, and then cut out gallium nitride wafers as substrates, and now he has finally mastered the preparation process of two-inch gallium nitride wafers, which is also the only one in the world that can do it at this stage.

Because of the use of gallium nitride wafers as substrates, the defect density of the prepared gallium nitride chips is also reduced to one thousandth of the original, and the yield naturally increases.

Whether it is the production of gallium nitride wafers or chip devices with gallium nitride as the substrate, precision nano processing technology is required, and the technical threshold is extremely high.