What are the relatively mature satellite navigation and positioning systems currently in use?

The satellite navigation and positioning systems currently in use with relatively mature technologies include: the United States’ Global Positioning System GPS, Russia’s GLONASS satellite navigation system, the European Union’s Galileo satellite navigation system GALILEO, and China’s Beidou Navigation Satellite Navigation System BDS. Beidou Satellite Navigation System (BDS) is a satellite navigation system independently constructed and operated by China focusing on the needs of national security and economic and social development. It is an important national system that provides all-weather, all-weather, high-precision positioning, navigation and timing services to global users. space infrastructure.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Satellite navigation system, also known as "Global Navigation Satellite System", also called Global Navigation Satellite System (GNSS), can provide users with all-weather navigation anywhere on the earth's surface or near-Earth space. Space-based radio navigation and positioning system with 3D coordinates and speed and time information. Consists of one or more satellite constellations and the enhancement systems required to support a specific mission.

The world’s four largest satellite navigation system suppliers announced by the International Committee on Global Satellite Navigation Systems include the United States’ Global Positioning System GPS, Russia’s GLONASS, and the European Union’s Galileo satellite navigation system (GALILEO) and China’s Beidou Navigation Satellite System (BDS).

China’s Beidou Satellite Navigation System (BDS)

my country’s independently developed navigation and positioning system is the “Beidou Satellite Navigation System” .

Beidou Navigation Satellite System (English name: BeiDou Navigation Satellite System, referred to as BDS) is a global satellite navigation system independently developed by China. It is also the third mature satellite navigation system after GPS and GLONASS. . BeiDou Satellite Navigation System (BDS), American GPS, Russian GLONASS, and EU GALILEO are recognized suppliers by the United Nations Satellite Navigation Committee.

The Beidou satellite navigation system consists of three parts: the space segment, the ground segment and the user segment. It can provide high-precision, highly reliable positioning, navigation, and timing services to all types of users around the world, all day long. It also has short message communication capabilities, and has initially developed regional navigation, positioning and timing capabilities. The positioning accuracy is decimeter and centimeter levels, the speed measurement accuracy is 0.2 meters/second, and the timing accuracy is 10 nanoseconds.

137 countries around the world have signed cooperation agreements with the Beidou Satellite Navigation System. With the success of global networking, the international application space of the Beidou satellite navigation system will continue to expand in the future.

With the development of Beidou system construction and service capabilities, related products have been widely used in transportation, marine fisheries, hydrological monitoring, weather forecasting, surveying and mapping geographic information, forest fire prevention, communication timing, power dispatching, and disaster relief Disaster reduction, emergency search and rescue and other fields have gradually penetrated into all aspects of human social production and people's lives, injecting new vitality into global economic and social development.

Satellite navigation systems are global public resources, and multi-system compatibility and interoperability have become a development trend. China has always adhered to and implemented the development concept of "China's Beidou, the world's Beidou", served the construction and development of the "Belt and Road" initiative, and actively promoted international cooperation on the Beidou system. Join hands with other satellite navigation systems and work with various countries, regions and international organizations to jointly promote the development of the global satellite navigation industry, so that the Beidou system can better serve the world and benefit mankind.

Applications of satellite navigation and positioning systems:

Global satellite navigation systems are used in military, resources and environment, disaster prevention and reduction, surveying and mapping, It has applications in power telecommunications, urban management, engineering construction, machinery control, transportation, agriculture, forestry, fishery and animal husbandry, archaeology, daily life, Internet of Things, and location services.

• Navigation

  is used for weapon navigation, which can accurately guide missiles and cruise missiles; for vehicle navigation, which can be used for route navigation, vehicle dispatching, and monitoring systems; for It can be used for route navigation and approach and landing control during aircraft navigation; it can be used for ship navigation, ocean navigation, and port/inland water diversion; it can also be used for personal navigation during personal travel and exploration.

• Positioning

  It can locate vehicles, mobile phones, PDAs and other mobile devices. It has device anti-theft. You can use electronic maps to check your location when traveling and exploring in the wild. It can also locate children or the elderly so that their exact location can be determined in time if they become lost.

• Measurement

  Using the carrier phase difference technology (RTK) in the global satellite navigation system, its measurement accuracy can reach centimeters, compared with traditional manual measurement , which has the advantages that manual measurement cannot match, such as high precision, easy operation, portable measurement equipment, all-weather operation, and no need for visual communication between measurement 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 systems for agricultural development, which can locate farmland information, monitor yields, collect soil samples, etc., and then analyze and process the collected data through computer systems to formulate more scientific farmland management measures. . Farmland information such as yield and soil condition can also be loaded into a sprayer equipped with a GPS device. The amount of fertilizer and pesticides can be accurately applied during the process of fertilizing and spraying farmland, which can reduce environmental pollution caused by fertilizers and pesticides.

• Rescue

  The use of global satellite navigation and positioning technology can improve the response speed of various departments to emergency events such as traffic accidents, traffic jams, fires, floods, crime scenes, etc. It can help rescuers rescue missing persons in harsh weather conditions and geographical conditions.

• Monitoring and Management

  Monitoring and management of the airport is to reduce the detention time of aircraft taking off and arriving, and to effectively dispatch aircraft, vehicles and personnel. Global satellite navigation and positioning technology can provide all-weather, safe and precise navigation functions for all flight runways in any climate environment. It can make aircraft using global satellite navigation and positioning technology more flexible, allowing them to operate independently when there is no one or when they are off the runway. The dispatch system can effectively organize ground traffic and handle apron accidents.

• Military

  Modern warfare has evolved into information-based warfare, relying on global satellite positioning systems to accurately guide missiles and bombs for target guidance. At the same time, it has also become an indispensable standard military equipment in infantry tactical combat. The global satellite navigation system is also of great significance to special operations, because it can provide all-weather and continuous concealed positioning, and users do not need to emit any signals, as long as they can receive satellite signals, they can be used. Therefore, during special operations, you can maintain contact with the headquarters without radio silence, obtain tactical support without sending a signal, and can change it at any time to confirm the ideal action path

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