The top three systems in the world?

The three major positioning systems recognized in the world today are GPS system, Beidou system and GLONASS system ("GLONASS" system).

1, GPS system: The GPS system was developed by the United States in the 1970s. Its main purpose is to provide real-time, all-weather and global navigation services for land, sea and air, and to be used for some military purposes such as intelligence gathering, nuclear explosion monitoring and emergency communication. After more than 20 years of research and experiments, it cost 30 billion dollars. By 1994, the global coverage of 24 GPS satellites is as high as 98%.

2. Beidou system: Beidou satellite navigation system is a global satellite positioning and communication system developed by China, and it is the third mature satellite navigation system after American GPS and Russian GLONASS. The system consists of space terminal, ground terminal and user terminal, which can provide high-precision and high-reliability positioning, navigation and time service for all kinds of users around the world, and has the ability of short message communication. It has initially possessed the ability of regional navigation, positioning and timing, and the positioning accuracy is better than 20m.

3. "GLONASS" system: "GLONASS" is a satellite positioning system similar to the American GPS system, which was built by the former Soviet Union in the early 1980s. It covers all the earth's surface and near-earth space, and also consists of three parts: satellite constellation, ground monitoring station and user equipment. Although the first satellite of GLONASS system was successfully launched as early as 1982, the whole system developed slowly due to the disintegration of the Soviet Union. It was not until 1995 that Russia spent more than $3 billion to complete the networking of GLONASS navigation satellite constellation. This satellite network is controlled by the Russian Ministry of Defence.

Global satellite navigation system

Global Navigation Satellite System (GNSS) is a space-based radio navigation and positioning system, which can provide users with all-weather three-dimensional coordinate, speed and time information anywhere on the earth's surface or near-earth space. GPS applications: precision agricultural positioning, scientific research (field biology, meteorology, earth science), environmental monitoring, emergency and disaster assessment, security, celestial bodies and architectural engineering, and natural resources analysis. Satellite navigation system has brought great social and economic benefits to mankind. Up to now, the relatively perfect satellite navigation systems include GPS in the United States and GLONASS in Russia, and Europe also plans to launch its own satellite navigation system Galileo.

robot

Android is an open source system developed by Android Company (later acquired by Google). Its advantage is that the software is diversified, most of the software is completely free, and the use is also free. Because it is an open source system, it is easy to brush the computer, and personalization can be said to be unparalleled. The interface is diversified and colorful. The disadvantage is that Android is greatly weakened in system upgrade because of its openness, occupying too much mobile phone configuration and RAM storage, and requiring higher CPU.

IOS

According to the report, due to the lack of product innovation, the market share of Apple iPhone in China market plummeted by 8.4%. As we all know, IOS is only used on Apple phones. In order to focus on building its own ecology, Apple's most intuitive feeling about the IOS system is fluency. Many people choose Apple phones just to use IOS, which brings some inconvenience to users in some places. However, we have to admit that this approach is conducive to system upgrade.

Yunos

Alibaba's yunos operating system has developed rapidly. According to Sino data, it has become the third largest mobile operating system. YunOS is based on linux, equipped with self-developed operating system functions and components, and its market share is second only to Google Android and Apple iOS.

In China, yunos operating system has been supported by a large number of mobile phone companies, including Meizu, Vito and Jiao Xiao. In the environment where Android has a large share, the homogenization of smartphones is serious, and YunOS has grown up, which can bring fresh blood to this industry. Although YunOS is an independent operating system, it is compatible with local Android applications. Yunos is also excellent in security. Yunos provides users with a comprehensive mobile phone security system.