Zhou Zhi knew that it was indeed not outperformed. The reason was very simple. After the satellite was placed in orbit, it would be difficult to upgrade and transform it, so it could only be replaced.
However, the replacement cost is quite high, and the speed of launching a new generation of satellites cannot keep up with the speed of the ground station iterated by Moore's Law on the ground.
This situation can only be achieved after Moore's Law basically fails, that is, electronic components develop to the point where they no longer rely on high-end top-level silicon oxide products that can also support most of human communication application scenarios.
This situation will take about 30 years to have a chance to achieve. "Yes, this is indeed a problem." Old Yu nodded in agreement.
"There are so many problems, Mr. Yu, how are domestic experts going to solve them for us?" Zhou Zhi knew that since these big guys from the Science and Technology Commission dared to throw out the problems, they were fully prepared. There is only one reason for doing this, which is to show the unique advantages of "East Three B" and surpass similar designs.
Sure enough, I heard Mr. Yu say: "The problem with application and market scenarios is that you are considering. Since you have such an idea, it means that you already have a relatively urgent need. Now we will only talk about our technology."
"The reason why the Iridium project requires so many stars is because of its orbit."
" According to the orbital height, communication satellites can be divided into low-Earth orbit, medium-Earth orbit, geostationary orbit, solar synchronous orbit and inclined geosynchronous orbit. Satellite communication systems built on different orbits are constructed based on different orbits. The system has different characteristics in terms of coverage, system capacity, transmission delay, satellite life, etc. "
" Among them, low-orbit satellite constellations are more suitable for building large-scale satellite networking. If a satellite Internet is to be formed, it seems inevitable to choose. Because the low-orbit satellite communication system has the advantages of short transmission delay, good stability, small link loss, and rich application scenarios. Of course, there are many disadvantages. The first is to achieve global coverage, and there are too many satellites needed. The advantages mentioned before are offset by the transmission between satellites."
"Of course, because the number of low-orbit communication satellites is large and present a network structure, even if there are problems with individual satellites, the entire network can still continue to provide reliable and continuous communication services, which constitutes a new advantage."
"But the cost of networking is much higher, mainly focusing on the launch cost. Sending six rockets and launching sixty rockets will be on the order of one billion, which constitutes a new disadvantage."
"In addition, according to the differences in application scenarios and business fields, low-orbit communication satellites are currently mainly narrowband mobile communications. In the communication system, the working frequency band of narrowband mobile communication is concentrated in the L and S bands. Because the frequency band is low, the application scenarios can only be dominated by medium and low-speed traditional handheld mobile communications and some Internet of Things services. They belong to low-throughput satellites. "
"In addition, Iridium adopts two representative modes of mesh networking. It seems quite advanced, but I forgot to consider the iteration speed of the ground station. It is the question raised by Mr. Li Lehai just now, artificially constructing the problem of iteration difficulty. "
" And these problems do not exist in our East Three B."
"First of all, we can design satellites as high-orbit satellites. The coverage area of a single satellite in high-orbit is relatively wide. At the height of a stationary orbit, a star can cover one-third of the earth, so the number required is much less than that of a low-orbit satellite."
"Of course, if the number of satellites is small, there will be damage to a single satellite, that is, it may affect the normal operation of the entire satellite communication system. However, this has been taken into consideration in your needs. The extra satellites not only bear the balanced load, but also have replacements when there is a problem with a single satellite. The overall number will not be too large, resulting in the launch of a single satellite. This has undergone a magnitude change. "
"Because the working frequency band is concentrated in the Ku and Ka frequency bands, the flux is more than ten times that of low-throughput satellites. In this way, high-throughput satellite communications do not have the problem of insufficient bandwidth capabilities of low-frequency and low-throughput satellites, and can support the future high-speed broadband Internet data transmission. ""In view of the iteration speed of the future ground stations, we tailor a new solution for everyone."
"If the Iridium system is the 'Tianxingtian.com', we call this solution 'Tianxingtian.com'."
"Tianxingtian.com uses satellites as network transmission nodes, and inter-satellite links are set up between satellites, so users can directly access the satellite Internet without passing through the ground network system. Its communication system can reduce the dependence on the ground network, flexibly route selection and network management, and the number of ground stations is smaller and there is no need to deploy ground stations in other countries. Therefore, the complexity and investment cost of the ground section are significantly lower."
"However, it also increases the requirements of user terminal equipment, and special equipment is needed to communicate, and if it is connected to ordinary ground communication equipment, the network service of the ground station is also required."
"The so-called Tianxingtian.com is a way different from Tianxingtian.com. We only use satellites as connections. The satellite does not have inter-satellite links, but accesses the ground communication network through the gateway main station, and then uses the global ground station to realize global network services. "
"If Tianxingtian.com arbitrarily receives the requirements of ground terminal equipment, then Tianxingtian.com first allows the communication requirements of ground terminal equipment that can be collected through the gateway main station, first summarized through the gateway main station, transmitted to the satellite, and then transmitted to the corresponding other gateway main stations or ground terminals. "
"Simple explanation is that although it is satellite communication, the problems that can be solved on the ground are first solved on the ground, and only if necessary communication needs are sent to the satellite."
"This idea is amazing!" Li Laoer's eyes lit up and immediately exclaimed: "In this way, the overall call cost can be reduced too much. The ground base station mode and satellite base station mode can be mixed, and it can also meet the communication between satellite phones and ordinary phones and mobile phones."
"But you just proposed to expand the redundancy and increase the number of satellites to fifteen, which gave us new ideas." Old Yu said.
"Then Mr. Yu, please tell me quickly." Li Laoer is much more active than Li Laosan and Zhou Zhi in this regard, and he has seen a wide range of application scenarios.
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For example, when the ground signal is not available, it will automatically switch to the satellite signal. This is something that is not available yet. It is very suitable for the needs of many special groups such as oceans and geology.
"The idea is actually very simple." Old Yu continued, "Since there are extra satellites, we can completely combine the Tianxingtian.com with the Tianxingtian.com."
"Because our satellites have a high orbit, we can completely cover all regions of the Earth except the North and South Poles with three stars. After adding to five, global satellite communication can be fully realized."
"But forwarding completely through the ground network management station will undoubtedly increase delays to many communication scenarios."
"Now that we have ten more stars, we have a more perfect solution!" (End of this chapter)
"But forwarding completely through the ground network management station will undoubtedly increase the delay to many communication scenarios."
"Now that we have ten more stars, we have a more perfect solution!" (End of this chapter)