Iridium intends to be an unprecedented innovative idea, and no one dares to say that it will succeed or fail until it is completed, and after it fails, it cannot be said that the original innovative idea is faulty.

However, the problems that have arisen in the process of Motorola's intended trade promotion are a very good negative teaching material for Huaxing Group Company.

It is true that the price of mobile phones, formats and areas of terrestrial mobile communication has been very mature, leaving a small market space for satellite communication networks, and there are relatively mature satellite communication operators in the world, such as maritime satellite communication systems and satellite television systems, but these satellites are high-orbit satellites, and the communication capacity of these satellites is very small, unable to solve the transmission of large-capacity data, and now a transponder = "r-" > for advanced foreign communication satellitesThe band bandwidth is 36 megabytes, and the total capacity of a satellite is very small, which can only provide the effect of calling, and users have no measures to enjoy the effect of high-speed Internet access.

The research and development of this satellite communication network system and the launch of satellites require high capital expenditures, so the voice communication services provided by satellite operators are extremely expensive, and even now they are only valuable in special environments such as ocean cruises, which is difficult to attract more paying households, and cannot benefit the population in areas without network coverage.

Moreover, the companies and plans to enter the low-orbit satellite constellation have been hitting the streets one after another, Motorola's Iridium is going to hang up, and another company has spent more than $9 billion on this investment, and now it is also on the verge of bankruptcy.

The threshold of this market is too high, it can be said that low-orbit satellite communications have no output on the basis of burning money, and these overseas giant companies have spent almost hundreds of billions of dollars on various efforts to pry this market, and it is no wonder that Huang Lao will have doubts.

Low-orbit satellite communication is not an obscure and difficult skill, that is, the use of a group of satellites whose orbit is much lower than the geosynchronous orbit to achieve global communication shroud, this communication network is really very advantageous, low-orbit satellite communication due to the low altitude, so the transmission delay is shorter, the path loss is small, can provide efficient and more cost-effective data distribution services for user terminals, and can achieve wide-area shrouding, for remote areas, aircraft, Ships and other places that cannot be reached by terrestrial networks provide network services, which cannot be done by terrestrial communication networks.

Moreover, the low-orbit satellite network is cheaper than the high-orbit satellite, cheaper than the high-orbit satellite network, and more comprehensive than the ground communication network, which is the natural advantage of the low-orbit satellite constellation, and can be considered to provide uninterrupted services to aircraft, ships, trains, automobiles and other tools.

The other is that the current Huaxing group company has been continuously researching and developing in the field of communication for many years, and it is stronger than Motorola in terms of communication technology strength, especially in the waveform research and coding modulation technology of microwave transmission technology and high-power transmitter and = "r-">="r-" > adaptive antenna technology have made different progress, and some aspects have come to the forefront.

It's just that many of these skills are only carried out on the ground, and Yang Jie also wants to move these product skills to the low orbit for experimental testing like Motorola.

In addition, Yang Jie also wants to advertise to the world through this project, show off his skills to the people all over the world, and confirm that Huaxing Group Company is a top technology company.

In addition, the customer goal of his initial research and development of this satellite communication network was to go to the military of Huaxia, and at the beginning, it was not necessary to launch 66 satellites in one kiss like Motorola, and only needed more than 20 satellites to cover the Asia-Pacific region, so the risk was much smaller.

Up to now, Huaxia's military satellite communication network is very small, and it is jointly developed with foreign satellite companies, and it is a high-orbit satellite, which cannot meet the needs of large-capacity data transmission at all.

On the basis of the needs of the first party in China, the project can maintain a balance of payments, if it can enter the fields of aircraft, ships, trains, and automobiles, it is still possible to achieve profitability.

As long as the profitability is achieved, the number of satellites will be gradually increased according to the growth of market demand, and the development of a fair and steady pace is what Yang Jie has to do.

"Elder Huang, I'm not going to launch a satellite right now. My goal is to develop a kind of cheap, smaller than the general satellite satellite, it is best to use the more mature satellite platform technology in China, and at the same time use the existing communication technology of our Huaxing group company, so that the small satellite has a higher transmission rate effect, can reduce the production cost of the satellite to 500 million US dollars, the initial launch of a few for experimental testing, if the test performance is more stable and reliable, the later launch of more than 20 for the Asia-Pacific region, and then depending on the situation and then build a larger network. ”

Yang Jie said with a smile: "Our company has now controlled the production process of 2-inch gallium nitride wafers, and started to produce high-power amplifiers in small batches, and we have developed a 20-watt signal transmitter in the laboratory, with a data transmission rate of 5, a 50% reduction in unit volume, a 70% reduction in power consumption, and a 30% reduction in heat generation, which greatly reduces the cooling system." ”

Huang Lao's eyes widened: "How did you do it?"

"We have developed a device technique on the GaN transistor process that can reliably reduce the resistance of the resistor to one-tenth of that of the previous technique, and the electrodes are discharged, resulting in a high density of electrons. ”

"In addition, we succeeded in reducing current leakage by efficiently distributing indium gallium nitride to form a barrier layer under the channel layer, thus maintaining a high drain current. ”

Yang Jie participated in the research and development of gallium nitride semiconductor materials and gallium nitride transistors in his previous life in Huatai Company, and has rich experience.

A company in the United States is also developing the technology of gallium nitride transistors, but his technical route is to use diamond as a substrate, and the specific processing process is to first paste the GaN-on-silicon wafer to a temporary silicon substrate, wait until the original silicon substrate is etched off, and then use the method to deposit diamond on the interface layer below the gallium nitride layer, and then process the gallium nitride wafer on the diamond substrate into an integrated chip.

Yang Jie directly prepared the gallium nitride wafer, and directly began to process the gallium nitride transistor on the gallium nitride wafer to make the chip.

In the previous life, the company almost reached more than ten years later in the gallium nitride transistor technology to mature, but now Huaxing group company now controls the gallium nitride material preparation and transistor processing process on the basis of the company, but now the yield is relatively low, if it can be mass-produced, within five years, Huaxing group company will be completely mature on this.

In recent years, Huaxing Communication Equipment Co., Ltd. has also done a lot of research on microwave transmission skills, waveforms and coding skills in various bands, and has accumulated a lot of skill patents.

In particular, Yang Jie attaches great importance to the transmission skills of the band, and these communication experts at the bottom are also fond of it, and they have also done a lot of research and development in this regard.

Now the power amplified power of the power device produced by Huaxing Group Company is 65 times the input power, if it is a small satellite, the solar sail panel can now supply more than 200 watts of power to the satellite at most, and the maximum power of the signal transmitter can be increased to more than 10 kilowatts!

That's a terrifying statistic!

And this is also where Yang Jie's confidence lies in wanting to go to the low-orbit satellite communication network.

Yang Jie can be very complacent to say that Huaxing Group Company is world-class in high-speed transmission technology, but these are experimental data, and Huaxing Group Company has no experience in satellite development, and he also wants to recruit some teams with experience in satellite development in China to develop these low-orbit communication satellites.

Although it is said that Huaxia is not the most advanced in terms of communication satellite technology, it still has the foundation of this technology, and it has also developed several satellite platforms for decades, which are still relatively mature and reliable.

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