What is the strength of China s Beidou communication system compared to other countries?

In the satellite communication system, Beidou has the functions of timing and precise positioning. In the satellite positioning system, Beidou has a high-speed two-way communication function.

On the satellite positioning system alone, in the case of Maozi's GLONASS crumbling and Europe's Galileo being far away, Beidou, which has positioning accuracy and speed far beyond GPS civilian code, is undoubtedly a good choice, not to mention a good two-way communication function.

There is only one point: two-way communication can be realized, and other navigation is generally one-way.

Compared with GPS, "Galileo" and "GLONASS", the advantage of Beidou navigation terminal is the combination of SMS service and navigation, and the communication function is increased; All-weather fast positioning, very few communication blind spots, the accuracy is comparable to GPS, and in the enhanced area, that is, the Asia-Pacific region, it will even exceed GPS; The services provided to the whole world are free of charge, and there is no limit to the number of users when providing services such as passive positioning navigation and timing, and they are compatible with GPS; It is especially suitable for large-scale monitoring and management of group users, as well as data transmission applications for users without relying on regional data collection; The unique central node positioning processing and command-type user machine design can simultaneously solve the problem of "where am I?" And "Where are you?" ”；Autonomous system, high-strength encryption design, safe, reliable, stable, suitable for key sector applications.

GPS global positioning system is currently the world's most widespread, the most positioning system, GPS in car navigation, mobile phone navigation has an irreplaceable status and role, but also most of the need for positioning work and software first choice. In recent years, China has also made a lot of achievements in independent research and development of positioning systems, that is, Beidou satellite navigation system. This is a positioning system independently developed by China, and it is only the beginning of the Beidou satellite navigation system.

Although the Beidou system and the GPS system are both for positioning purposes, they are still technically different from each other. Compared with the GPS system, the Beidou system, as a new star in positioning, is slightly inferior to the GPS system in terms of accuracy, and the error is larger than that of the GPS system. After all, China's Beidou system has just begun, and the Beidou system has not yet been fully deployed.

The GPS system has long been able to provide high-precision positioning services all over the world, and the difference between the two is not big, but the Beidou satellite navigation system is currently only available in Asia, also because the Beidou system has not yet been fully deployed.

The Beidou satellite navigation system is all independently developed by China, and the GPS system is developed by the United States and promoted to the world, and the birth of the Beidou system has gradually reduced the influence of the United States on China. Today, when the instability of the international situation is gradually increasing, the advent of the Beidou system has provided another powerful guarantee for our country and deterred those countries that are ready to move. The Beidou system has only been used in a few years since its inception throughout China, and now the comprehensive network has been successfully built, and it is believed that it will play a more important role in the future.

The construction speed of the Beidou satellite navigation system in China in recent years is very rapid, and this plan has almost been reached in recent years, and the positioning system is also an indispensable part. It is believed that after the Beidou system is fully deployed, its accuracy can be comparable to or even surpass the GPS system, and then provide global positioning services, which also eliminates the dependence on science and technology to a certain extent, and looks forward to its future performance.

It is an information navigation service provided by China's independent satellites, with network communication and information transmission. There is a difference between the two.

The Beidou Navigation Satellite System is a global satellite navigation system developed by China itself, and it is also the third mature satellite navigation system after GPS and GLONASS. There is still a difference between the Beidou system and GPS, the Beidou positioning is a global satellite navigation system independently developed by China, and the GPS is a global satellite positioning system jointly developed by the United States, the Navy, Army and Air Force.

Beidou is named after the Big Dipper, which is currently fully covered by 45 satellites and has been fully completed this year. The transmission of Beidou is a short message, and the dual-frequency is the mobile phone request signal, and the satellite transmits the signal. The same is the navigation system.

Because China's Beidou system is still different from GPS in civilian use. Most mobile phones are equipped with the Beidou system, but the default system still uses GPS navigation. If you go for personalization, then it can be the Beidou system, if there is no personalization, it will default GPS.

Now most of the mobile phones are Beidou system and GPS dual navigation. The GPS navigation system is better to use than the Beidou system in civilian use.

At present, the Beidou system is used in aerospace, and the cost of the Beidou system is relatively high, so it has not been widely used. The cost of GPS is relatively low.

This is done for better use, and the commercial comparison of the Beidou system is still a little worse than GPS.

Yes. Beidou system accuracy.

Extremely high, no worse than the US GPS. After all, the accuracy of the Beidou system has reached the sub-meter level, and even the highest positioning is centimeter, even if it has the world's first title of GPS, it can only look up in terms of accuracy.

You must know that GPS has been in the market for many years, so it will inevitably improve in terms of accuracy, but for selfish reasons, the Americans will naturally not provide GPS with higher performance to other countries.

Therefore, in this context, China's determination to independently develop the navigation and positioning system has been strengthened, so Beidou has made a strong debut, and the Beidou system has achieved global coverage and completed the global networking.

It can be said that the two are comparable. The difference between the two is that in addition to the 27 satellites in the middle circle of the earth orbit and orbiting the world, Beidou also has 10 satellites in inclined geosynchronous orbit, and the figure-8 trajectory can enhance the signal coverage in the Asia-Pacific region; There are also 8 in geostationary orbit, which can serve the Asia-Pacific region at all times. Geostationary orbit satellites can enhance the signal first, and secondly, they can send short messages, in case of strong **, it is very useful to send short messages.

Tilted geosynchronous orbit satellites can enhance signal strength at high latitudes. In addition, these two satellites have greatly improved the accuracy of positioning.

GPS uses a combination of cesium atomic clock and rubidium atomic clock, while Beidou uses rubidium atomic clock and more advanced hydrogen atomic clock. The hydrogen atomic clock is mainly a stability index, which is better than the rubidium atomic clock and the cesium atomic clock.

Beidou can send short messages, this is very useful, when there is no mobile phone signal, short messages can be sent with location information, you can SOS call for help, and the person who receives the message can directly locate the caller. The accuracy of GPS in the level is still slightly better than Beidou, and Beidou is slightly better than GPS in elevation. The effect of Beidou's global coverage needs to be further tested.

There is a professional problem, both need base stations, with the power of the United States in the world, and most of the Beidou base stations are in China's territory, so in terms of domestic positioning accuracy Beidou has a great advantage, globally, Beidou is still inferior to GPS. This is not determined solely by who has launched the satellites. <>

There are two understandings of communication capacity, if it refers to the Beidou generation RDSS, it is because the RDSS positioning and communication mode requires the user machine to send positioning applications and communication applications to the central station through the satellite, and the channel resources of the satellite are limited, so the communication capacity is limited and the number of users is limited. Both the Beidou II (RNSS) and GPS use passive positioning, and there is no such problem. If it refers to the B1 frequency point of the second generation of Beidou, because the channel resources have been preferentially occupied by GPS, the pseudo-code bit rate is only 2M, less than 10M of the GPS military code, which will affect the measurement noise and multipath error.

Since the pseudocode is a ruler that measures the distance from the satellite to the receiver, the higher the code rate, the shorter the code, and the more accurate the measurement. The multipath effect is too complex to be not.

The difference between China's Beidou system and the United States' GPS system lies in accuracy, and China's Beidou system is relatively more accurate.

From the technical level, the characteristics of Beidou and GPS are compared, and the differences between the technical principles of Beidou system are sorted out. Including: 1, three-frequency signal 2, active positioning and passive positioning 3, short message communication services 4, domestic monitoring 5, step-by-step opening 6, local strengthening, gradual maturity 7, positioning accuracy 8, promote the upgrading of the entire manufacturing industry 9, construction speed.

Beidou is stronger.

There is no way to compare, Beidou is not as good as GPS in terms of stability, but in other aspects, although Beidou has a relatively small interview time, the functions are also relatively complete.

The Beidou system covers a wide area, and then integrates the functions of navigation and communication, which can monitor real-time navigation, and at the same time, it can also achieve the effect of judging the state to quickly assign the position, and can also report the location at the first time, and then it can be used for measurement or mapping, and can also warn of disasters, which has surpassed other countries, such as the United States; It is because China's Beidou system has a strong extraterrestrial attack capability and can perfectly deal with military **.

The anti-occlusion ability of the Beidou system is quite strong, integrating navigation and communication capabilities, and the application of the system is beyond our imagination, so it is quite good. The function of the Beidou system is quite strong, the system navigation ability is beyond our imagination, and the GPS system is super powerful.

More than half of the world's countries.

Beijing News (Reporter Chen Lin) On November 4, at a press conference held by the State Council Information Office, Ran Chengqi, director of the China Satellite Navigation System Management Office and spokesman of the Beidou Satellite Navigation System, introduced that Beidou has been applied in more than half of the countries and regions in the world.

Promoting the international application of Beidou is a major event that we have always had to grasp. Ran Chengqi said that the "Belt and Road" countries are focused on and considered. In fact, when Beidou-2 was completed in 2012, it had already promoted the internationalization of Beidou, and through continuous efforts, it had achieved very obvious results.

In 2018, when the Beidou-3 basic system was just completed, it took the lead in providing services to the "Belt and Road" countries in Fanchang.

At present, Beidou has been applied in more than half of the world's countries and regions, such as Saudi Arabia, and has been used in the collection of surveying and mapping geographic information, urban municipal infrastructure construction, and desert personnel or vehicle positioning. In Tajikistan, based on the Beidou system, the dam deformation monitoring of the Sarez Lake dam is continuously monitored in real time, with an accuracy of millimeters, ensuring the safety of the dam and the safety of local people's lives. In Lebanon, Beidou's high-precision technology has been successfully applied to the construction survey of the port terminal in Beirut, Lebanon.

Burkina Faso, Africa** used Beidou high precision in the construction of the hospital in the process of accurate surveying and mapping, especially in the current new crown pneumonia epidemic, shortened the construction time by more than half, and completed the construction survey in 6 days, making a great contribution to the prevention and control of the epidemic.

At the same time, Beidou has been successfully applied in ASEAN, South Asia, Eastern Europe, West Asia, and North Africa, such as China-Europe trains, as well as related highway transportation systems, cross-border transportation, etc., and the Beidou system has also played a very good role.