Which of the four current satellite positioning systems is better?

The emergence of the four major satellite navigation systems is based on national backgrounds, so in terms of function (accuracy), service, and confidentiality.

In the civilian market, there are slight differences in different regions, and in the military market, each company prioritizes supporting its own application systems, as well as encrypted content.

Let's talk about them one by one, the four major satellite navigation systems: GPS in the United States, GLONASS in Russia, Beidou navigation system in China, and Galileo in Europe. These four navigation systems are all GNSS, that is, global satellite navigation systems, but the names are different.

Comparison of the advantages of several macro systems: different regions have their own advantages.

The name GPS is familiar in China, and everyone once thought that GPS was synonymous with satellite navigation systems, but it is not. GPS is just a satellite navigation system in the United States, the reason why GPS is so well-known, on the one hand, is because before China did not have a mature application of Beidou, GPS is in the Chinese civilian market, the most cheap, and widely used, so everyone thinks GPS is good.

The development of GPS has also gone through many iterations. It wasn't that tough at first. Even now, in Asia, Beidou's civilian accuracy is more than GPS.

This is because Beidou's navigation enhancement technology for Chinese mainland and Asia is definitely better than the GPS of the full layout in Asia.

Similarly, in the European region, the Galileo system is slightly better than several other systems. At high latitudes, the Russian GLONASS is slightly better than several other systems.

To put it bluntly, all systems are fully considered, their own home field, and then universally promoted and used.

But this gap is not very large. At least not a difference of 100 meters and 1 meter.

Differences in the individual navigation systems of the subdivision:

1. Glonass in Russia and GPS navigation systems in the United States.

GLONASS is a Russian former Soviet Union.

A space-based radio navigation system corresponding to the American GPS system.

It consists of 24 medium-orbit (MEO) satellites, ground control mechanisms and user equipment.

FDMA technology, PRN ranging.

Changes in the number of satellites:

Russia's GLONASS (GLONASS Satellite Navigation System, a product of the former Soviet Union. However, in the follow-up improvement and construction, it is mainly Russia that plays its role.

2. GPS satellite navigation system in the United States.

The construction of GPS is very early, although the first satellite was launched by the Soviet Union, but under the leadership of NASA, the speed of GPS construction in the United States is very fast.

I think that in the current satellite positioning system, China's Beidou positioning system is better than the GPS positioning system. It's not just that Beidou is newly built, but also because it's our country's own.

Beidou system. Because the Beidou satellite positioning system is the most advanced and the positioning accuracy is very high, it should be very extensive, so the Beidou satellite positioning system is better.

GPS in the United States, GLONASS in Russia, Beidou Navigation System in China, and GaliLeo in Europe. These four navigation systems are GNSS, and the GPS establishment should be relatively preemptive, and each positioning system has its own merits.

As of December 2020, the four major global positioning systems are: GPS in the United States, Galileo in the European Union, and GLONASS in Russia.

China Beidou. 1. U.S. GPS

by the U.S. Department of Defense.

It began to be designed and developed in the early 70s of the 20th century and was completed in 1993. In 1994, the United States announced that it would provide GPS access to the world free of charge for 10 years, but the United States only provided low-precision satellite signals to foreign countries. It is said that the system has a "back door" set up by the United States, and in the event of a war, the United States can turn off information services to a certain region.

2. Galileo of the European Union.

The European Union first published the Galileo satellite navigation system in 1999.

plan, the purpose of which is to get rid of the European global positioning system for the United States.

to break its monopoly and form the "Galileo" satellite positioning system. The project will launch a total of 30 satellites with a position accuracy of several meters and will also be compatible with the GPS system in the United States.

3. GLONASS, Russia.

GLONASS is a satellite navigation system developed and deployed by Russia alone, which was launched in the 70s of the last century, and Russia has 22 GLONASS satellites in orbit, but only 16 are operating normally. The system requires 18 satellites to meet the needs for continued navigation services for all of Russia, and at least 24 satellites to provide global navigation services.

4. China Beidou.

At 00:34 on May 25, 2003, China was at the Xichang Satellite Launch Center.

With the "Long March-3A" carrier rocket, the third "Beidou-1" was successfully converted.

The first two "Beidou-1" satellites were launched on 31 October and 21 December 2000 respectively.