What are the four global satellite positioning systems?

The world's four major satellite positioning systems are: the United States' gps global positioning and navigation system, the Russian glonass system, the European Union's Galileo global positioning and navigation system, and China's regional satellite positioning system Beidou navigation system.

Global satellite navigation system (GNSS), also known as global navigation satellite system, 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? . Include one or more satellite constellations and their augmentation systems required to support a specific task.

Extended data

measure

Using carrier phase difference technology (RTK) in global satellite navigation system, its measurement accuracy can reach centimeter level. Compared with the traditional manual measurement, it has incomparable advantages such as high precision, simple operation, portable measuring equipment, all-weather operation and no visibility between measuring points. At present, global satellite positioning technology has been widely used in geodesy, crustal movement, resource exploration, cadastral survey and other fields.

agriculture

Many countries have used global satellite navigation system for agricultural development, which can locate farmland information, monitor yield and collect soil samples. Then the collected data are analyzed and processed by computer system to formulate more scientific farmland management measures. You can also load farmland information such as yield and soil condition into a sprayer with GPS equipment, so as to accurately use the dosage in the process of fertilizing and spraying pesticides on farmland and reduce the environmental pollution caused by chemical fertilizers and pesticides? .