The difference between Beidou short message and short message

"Is technology borderless?" I believe everyone often hears this sentence. However, the author sneered at this sentence. Some people may ask, why do I say this? It's actually quite simple. This sentence is used by European and American countries to deceive others. If you take it seriously, you will really lose.

I believe everyone knows that there is a technology giant in China-Huawei. A few years ago, the United States used the entire national machinery to suppress sanctions against Huawei. Fortunately, Huawei has made some spare tire plans in advance, but now some of Huawei's core businesses have suffered huge losses, which have not been slowed down until now.

One of the reasons is that Huawei has mastered a lot of advanced technologies in the 5G field, which makes the United States feel pressure. The United States can't let other countries' science and technology surpass itself, only let itself lead others. I'm sorry if someone else walks in front of me, but I'll hit you and turn yours into mine, by hook or by crook (carrot and stick) in the process. Alstom in France is an obvious example.

In fact, there are many companies or technologies in the United States that use science and technology to rectify other countries. Some people may ask, why doesn't the United States rectify the Beidou navigation system like Huawei?

China Beidou Navigation System —— The Bitter History of Forced Development

Speaking of China Beidou navigation system, it is simply a bitter history of forced development. After technical blockade and framing, China finally built the Beidou satellite navigation system. It can be said that the Beidou navigation system was developed in this way.

However, when it comes to navigation system, people often talk about GPS for the first time. Yes, GPS is one of the four major satellite navigation systems in the world. The other three are GLONASS of Russia, Beidou of China and Galileo of the European Union.

The first satellite navigation system was not GPS.

The first satellite navigation system in the world is meridian satellite navigation system, also known as "Naval Satellite Navigation System (NNSS)". It should be clear from the name alone that the satellite navigation system first served the military field, not the civilian field.

1On April 3rd, 960, the first satellite of Meridian satellite navigation system was successfully launched, until1June, 964, the first fixed navigation satellite 5C- 1 was successfully launched and officially delivered to the US Navy. 1July, 1967, the meridian satellite navigation system was networked and used, and the civil field was opened. The navigation and positioning of the "meridian instrument" has reached an astonishing 20 to 50 meters.

GPS was developed by the United States in the 1970s and absorbed the successful experience of meridian satellite navigation system. It lasted more than 20 years and cost tens of billions of dollars. Finally, in 1994, all 24 satellites entered the scheduled orbit in space, and successfully built a new generation of GPS (global positioning system) in the United States, covering almost the whole earth. When the United States established GPS at that time, the problem to be solved was whether the satellite was placed in low-earth, medium-high orbit, and the cost-effectiveness ratio was the best.

Low-Earth orbit launch costs and high precision, but it needs hundreds of satellites to cover the whole world, which is too expensive and unaffordable.

High orbit, theoretically, all three can be done, but the accuracy is poor, the launch cost is high and it is difficult.

The United States finally seized the middle orbit and completed the layout with 24 satellites. Medium orbit can be used not only for satellite systems, but also for personal communication. As a satellite navigation system, it can achieve real global coverage and more effective frequency utilization.

GPS can provide all-round real-time navigation and positioning in land, sea and air, and has won the favor of many people for its all-weather and high precision. At the same time, GPS not only opens the civil field, but also realizes the global free system. This paves the way for China and even Europe to develop their own satellite navigation system.

What is the most expensive? Of course it's free.

In fact, the initial implementation of GPS free was a last resort, because the relevant fees were difficult to collect at that time, and to put it bluntly, they could not be collected. The United States can only choose to turn off or turn on GPS signals in a certain area, rather than controlling the number of devices connected to GPS. In this way, instead of free use, it is better to bend the rules and let everyone use it for free. At the same time, I tell you that instead of spending huge sums of money on research and development, it is better to use American products directly, which saves money and saves trouble, killing two birds with one stone!

In this way, GPS ushered in a period of rapid development and almost monopolized the global market. In GLONASS, Russia, only a few satellites can work normally due to financial problems. At that time, it can be said that nothing on the market can be compared with GPS.

The whole world soon saw the powerful performance of GPS. 199 1 during the gulf war, the us military applied this system in the war and even realized a "battlefield miracle." Relying on GPS signal navigation, the US military realized that two missiles hit the same target successively. The war shocked many countries in the world. So war can be like this.

Subsequently, many countries added GPS system to their weapon systems. China has also installed a civilian version of GPS on its weapons (the military version is only available to the US military), but it has been worried about relying on American GPS. If you always rely on American GPS, it may bring unbearable costs. However, the fear soon became a reality.

Interrupt GPS signal-China missile failed to hit the target.

However, there is no free lunch in the world, and soon the United States brought its original hegemony to GPS. From 65438 to 0996, some people in Taiwan Province Province made inappropriate remarks, which once caused tension in the Taiwan Strait. China People's Liberation Army immediately held military exercises and fired missiles at the East China Sea near Taiwan Province Province as a warning.

However, the PLA has launched three missiles, of which only the first one hit the target, and neither the second nor the third actually hit the target. It can't even be tracked in time, which eventually leads to the serious separation of two missiles from the target area.

After the analysis, it is concluded that the United States suddenly interrupted the GPS signal, which led to the failure of launching two missiles. Even when the situation in the Taiwan Strait was tense, the US military sent an aircraft carrier battle group for support. Faced with this situation, the PLA can't track the American aircraft carrier effectively and continuously, and ultimately it can't carry out a strong deterrent. I have to say, I am really wronged. Then, China made up his mind that no matter how much money he spent, he must make his own satellite navigation system.

China has long planned to develop a satellite navigation system, but the lack of funds can only temporarily put the plan on hold. However, after this painful lesson, China restarted the satellite navigation system plan and formulated the "three-step" strategy of satellite navigation system, namely Beidou 1, Beidou 2 and Beidou 3 systems.

Among them, two geostationary orbit satellites were launched in 2000, and the system was completed and put into use. In 2003, the third geostationary orbit satellite was launched to further strengthen the system capability. Since then, the Beidou 1 satellite navigation system has been successfully established and the first step strategy has been realized. Because China had no money at that time and the best orbit was occupied (middle orbit), the first generation Beidou system could only use three satellites to realize the most basic navigation system. As for accuracy, I believe everyone knows!

Joining Galileo is painful.

However, while China was building the Beidou-2 navigation system, the European Union extended an olive branch and invited China to participate in the Galileo satellite navigation system.

According to the agreement, China plans to invest 200 million euros, enjoying one-fifth of the ownership and 65,438+000% of the right to use. At that time, the cooperation between the two sides can be said to have their own needs. The EU has taken a fancy to China's huge market, but China doesn't want American GPS to dominate.

The countries in the European Union are fighting in secret (the United States is suspected to be behind the scenes), and they only care about their own immediate interests, even excluding China from the investors, and do not provide or share core technologies at all. Let China down in an instant. Later, he withdrew from Galileo system and resolutely developed Beidou system independently. And this also confirms the sentence "It is better to rely on others than to rely on yourself".

Amazing China speed-Beidou satellite is launched quickly and networked.

The EU launched the first Galileo satellite in 2005. China's Beidou II didn't launch its first satellite until 2007.

Subsequently, from 20 10 to 20 12, China showed the EU and the world what the "China speed" was. In three years, China used a 12 rocket to send 14 satellites into the sky. Since then, all the Beidou-2 16 satellites have entered the scheduled orbit, officially announcing the completion of the Beidou-2 satellite navigation system.

In 2009, China launched the Beidou-3 satellite system plan. By 20 18, 19 satellites have been launched, networking has been completed, and the basic construction of Beidou-3 satellite system has been completed. On June 23, 2020, the thirtieth satellite was successfully launched. Since then, the Beidou-3 system has been fully completed and provided services to the world, successfully completing the third-step strategy of Beidou satellite navigation system.

After 20 years' efforts, China people have completed the 40-year course of Europeans and Americans. More than 80,000 people and more than 300 scientific research institutions have explored their own way for China's satellite navigation system, but only China people can understand its sadness.

On-board atomic clock-3 million years a second difference, money is hard to buy technology.

Yang Changfeng, chief engineer of Beidou, once said that China's participation in Galileo is for the atomic clock on board and is also a core of Beidou navigation system. However, when signing the contract, Europeans refused to provide it. So, what can China people do? They can only roll up their sleeves and work hard. It took three scientific research units more than two years to catch up. Finally, China's on-board atomic clock was built, and its accuracy reached an amazing one-second difference of 3 million years, far exceeding the 65,438+one-million-year difference of peers. In this way, China broke through the foreign technical blockade.

Inter-satellite link-the unique skill of Beidou-3

In addition, Beidou-3 has three other unique skills that the satellite navigation system does not have. It is an inter-satellite link, which can exchange information between two satellites, and it is also an important means for Beidou-3 to realize global navigation service.

Inter-satellite link can realize data transmission between invisible and visible navigation satellites in space, which greatly improves work efficiency and reduces related costs. At the same time, with the support of inter-satellite link, satellite navigation system can realize autonomous navigation. To put it bluntly, it means that satellite navigation signals can be received only by satellites without relying on the ground system to achieve accurate navigation.

In addition, the Beidou system also has strong anti-occlusion ability (using three kinds of orbits to form a mixed constellation); The combination of high precision (multi-frequency signal combination improves precision) and navigation and communication capabilities makes it have five functions: real-time navigation, rapid positioning, accurate time service, position report and short message communication.

In particular, short message communication played an important role in the 2008 Wenchuan earthquake. Short message is similar to "short message", which is to send a "short message" to Beidou satellite without any internet or other means of communication, and then deliver the "short message" to the person who wants to deliver it through Beidou satellite.

After the Wenchuan earthquake, all the signals in the earthquake zone were interrupted, and the disaster information could not be transmitted in the first time. The short message of Beidou system can be transmitted directly by satellite, which is not limited by the signal, which greatly facilitates the follow-up rescuers.

Although we have invested a lot of money in Beidou satellite navigation system, we have also made many technological breakthroughs. At the same time, the global output value of Beidou satellite has reached more than 300 billion yuan in 20 19. In 2020, it has already exceeded 400 billion yuan. In just one year, it has soared by 654.38+000 billion, and the output efficiency is really amazing. At present, more than 100 countries have signed the Beidou navigation system cooperation agreement with China, and more countries will cooperate with Beidou in the future.

Now China's economic and military strength (anti-satellite capability) is very strong, and the United States has also missed the opportunity. Now if you want to punish Beidou by some means, you have to weigh it yourself. China's strong self-confidence forced the United States to give up this idea.