There is a news in front of us, I don't know if everyone pays attention to it, that is, Musk's star chain almost hit our space station, fortunately, we shifted in time to avoid an accident.
At present, there are many satellites in low-orbit space, especially after Musk proposed the Starlink plan, countries and some communication companies have opened the road to starlink layout.
What impact will the Starlink Project have on our future?
Let's take a look at Musk's Starlink, which is probably the news that has the biggest impact on the entire system.
January 19 news, january 18 at 9:02 pm Eastern Time, a two-stage SpaceX Falcon 9 rocket carrying 49 Starlink satellites lifted off from NASA's Kennedy Space Center in Florida. After the send, Musk's Starlink program has reached 2,000 low-orbit satellites in space.
More Starlink satellites should be launched in the coming weeks and months, SpaceX has received permission from the Federal Communications Commission to launch a total of 12,000 Satellites, and the company has submitted documents to the International Telecommunication Union to prepare for another 30,000 launches.
Why is Musk able to launch satellites so often? Let's take a look at the recovered data of the Falcon rocket, the successful landing of Musk's rocket on January 18 was the 103rd overall landing of SpaceX, which often reuses space hardware to improve efficiency and reduce costs.
The reduction in the cost of rocket launch directly makes the layout of low-orbit satellites a reality and sustainable propulsion.
Why the Starlink program appeared
This is the competition between China and the United States in outer space, and there is also competition in the field of medium and low orbit. The reason why the current satellite communication is not widespread is because it is too expensive, and then the satellite coverage rate is not 100%, because the satellite revolves around the earth, and if it cannot be fully covered, there will be a situation where the satellite signal is interrupted.
Please look at the following figure, yes, you read it right, 300 yuan per month, in order to include 20M, not 20G traffic. 100 yuan per month, can only make 60 minutes of phone calls, internet access is not OK. Why is it so expensive? It is not because the bandwidth of satellite communication is too scarce, it can only be used by a few people, and the more people there are, it is congested.
What is the StarLink program
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SpaceX's starlink plan refers to the placement of 12,000 communication satellites at a height of 300-500KM to achieve the purpose of covering the global network, it is said that the number of satellites has been applied for the record to 42,000, and there are only 2,600 satellites in orbit in the world.
The principle of starry orbit occupation is first-come, first-served, and who occupies it uses it, because the orbit and frequency resources of the earth's low orbit are limited, and whoever possesses it first is who uses it
Starry Sky Band, KA, KU
The United States proposed the Starlink Program. According to the plan, between 2019 and 2024, a "starlink" network of about 12,000 satellites will be built in space to install global Wi-Fi for the world.
The US Starlink program will have a huge impact on the military, communications, Internet and other fields, and has to attract our sufficient attention.
Ground stations, which require gateways and terminal receivers, also need to build a lot of receivers.
The communication principle of the Starlink program
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Traditional mobile communication, whether it is 2G or 5G, must rely on the base station and antenna to connect wirelessly with the user, the base station through the optical fiber and the operator's core network connection, and finally realize the user and the Internet interconnection.
Satellite phone, as the name suggests, is to use the satellite as a relay method of communication. When you use a satellite phone, your phone transmits a wireless signal to a satellite wandering around the Earth orbit, and it is helping you transmit the signal to the ground station, which is then transferred to the operator's network, so the phone is connected.
Whether it is 4G, 5G mobile communication, or WiFi, or satellite communication, the underlying principle is the same, which is to transmit the modulated information between the user's mobile phone (or other terminals) and base stations, wireless routers, and satellites through electromagnetic waves.
Shannon's theorem: Shannon's theorem gives the upper limit of the channel information transmission rate (bits per second) and the channel signal-to-noise ratio and bandwidth. Shannon's theorem can explain the difference in the maximum throughput of a single carrier supported by various modern wireless formats due to different bandwidths
- The development process of the Starlink project, in fact, there has always been a Iridium plan before, but it has not been successful. The main reason is the launch cost and operating cost.
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StarLink's development goals
The only hope for Huawei's 5G technology cornering overtaking can be realized
The future of the StarLink program
spaceX
One arrow 60 stars, 30 launches a year, 27 years of successful networking
In January 2015, Musk announced that SpaceX plans to launch about 12,000 communications satellites into orbit, a project named Starlink.
A single satellite covers a much smaller area, about 3.53 million square kilometers, still more than one-third of China's land area
The constellation of The Wild Goose
Satellite base station, seizing the lead, launched the first one on December 29, 2018
Rainbow Cloud Project
The Rainbow Cloud Project is to move the Internet we usually use into space. It is built on more than 100 Internet satellites in orbit 1,000 kilometers above the ground.
At 7:51 a.m. on December 22, 2018, China successfully launched the Hongyun Engineering Technology Verification Satellite at the Jiuquan Satellite Launch Center with a Long March 11 carrier rocket, which was even faster than SpaceX.
Tiantong No. 1
The "Tiantong-1 01 satellite" of satellite communications is the first high-orbit mobile communication satellite on the mainland that was officially launched in August 2016. This satellite alone can cover China and its surroundings, the Middle East, Africa and other related regions, as well as most of the Pacific Ocean and indian oceans. And there is no limit to the coverage terrain, and the ocean, mountains, grasslands, forests, Gobi, and desert can all be seamlessly covered.
Netizen opinion
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Optimists: Whether the Starlink project is strong or not, whether the rumors are true or not, they do have a lot of high-tech things, and there are too many high-tech things that we can't understand at this stage.
Opposition: Serious suspicions are that space junk was maliciously created to occupy orbit.
Astronomical observations
Space junk
Bump into other satellites
Failure rate 5%
Skepticism: Not practical, is to sell feelings. If nothing else, the earth's area is 510 million square kilometers, and 12,000 satellites want to cover the world, that is, each satellite should cover 42,500 square kilometers. What concept? That is 2.6 Beijing size, a satellite to bear the communication of 2.6 Beijing population? Think about it too much, the bandwidth for texting is not enough, let alone the Internet. Do you know how many optical 4G base stations have been arranged in Beijing in order to achieve the current communication services? Roughly estimated, 80,000-100,000. If nothing else, think for yourself.
Strategic Significance:
Battle for Space: Will starlink satellites become space laser weapons to carry out precision strikes against the ground.
U.S. hegemony: Low orbit occupation will be fully proud of the earth, carry out information blockade and so on.
China's rise: Tiangong, Beidou, and Chang'e have successfully lifted off, breaking the previous monopoly of space monopoly monopolized only by the United States and Russia.
Seize space resources
Amazon: Amazon has announced plans to launch about 3,200 Internet satellites
California startup Astra recently filed a paper on its giant constellation of about 13,000 satellites.
oneweb: OneWeb is building a network of 648 Internet satellites and has put nearly 400 of them into orbit.