The hottest Beidou satellite navigation system mee

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Beidou satellite navigation system meets the global application requirements and ensures the time benchmark of power equipment. The satellite navigation system is a global public resource, and multi system compatibility and interoperability has become a development trend. China continues to practice "China's Beidou, the world's Beidou", actively promotes international cooperation in Beidou satellite navigation system, strengthens compatibility and sharing with other satellite navigation systems, vigorously promotes the international application of satellite navigation, and makes Beidou satellite navigation system better serve the world and benefit mankind

independent construction and operation

integrated navigation and communication

China Beidou navigation satellite system (BDS) is an independently constructed and independently operated satellite navigation system focusing on the needs of national security and economic and social development. As a high-precision spatial position and time benchmark, it provides all-weather, all-time, high-precision positioning Important national space infrastructure for navigation and timing services. The Beidou satellite navigation system (BDS) is the third mature satellite navigation system after the US global positioning system (GPS) and the Russian GLONASS satellite navigation system (GLONASS). Together with the US GPS, the Russian GLONASS and the EU Galileo Galileo, BDS has become the global four David satellite navigation system

China adheres to independent innovation and step-by-step construction, and has gradually formed the "three-step" development strategy of Beidou satellite navigation system. On november5,2017, the first and second satellites of beidou-3 were successfully launched in the form of "one arrow and two satellites", opening a new era for the global group of Beidou satellite navigation system; On december27,2017, the office of the State Council held a press conference on the fifth anniversary of the opening of the Beidou system. Beidou-2 continues to operate stably. Beidou-3 will build a basic system of 18 satellites by the end of 2018 to provide services for countries and regions along the "the Belt and Road"; By the end of 2020, a complete system of 30 satellites will be built to provide global services

the Beidou satellite navigation system innovatively integrates navigation and communication capabilities, and has five functions: real-time navigation, fast positioning, accurate timing, location reporting and short message communication services. The positioning accuracy is better than 10m, the speed measurement accuracy is better than 0.2m/s, and the timing accuracy is better than 50 nanoseconds (5 billionths of a second). Beidou system related products are widely used in transportation, marine fisheries, hydrological monitoring, weather forecasting, geographic information mapping, forest fire prevention, communication, power, disaster relief and disaster reduction, emergency search and rescue and other fields. Domestic Beidou chips have achieved large-scale applications. Most of the world's mainstream chips support Beidou. Beidou has become a standard configuration for domestic intelligence. Shared bicycles can be finely managed through the Beidou system. Beidou watches, bracelets and student cards are supported, making daily life more convenient

Beidou satellite navigation system structure

continuous improvement of system performance

the satellite navigation system is a navigation station that takes the satellite as the known position and time benchmark, and determines the user's position vector through the radio signal transmitted by the satellite. The navigation system consists of satellite constellation in space segment, ground operation and control system and user terminal. The satellite constellation in the space segment is composed of several navigation satellites with complete functions and performance indicators, which work in the specified space orbit position. The navigation satellite is the core part of the system. The ground operation and control system includes the main control station, time synchronization/injection station, monitoring station, etc. there is also a movable horizontal 10 character header (10 character beam) on the top. The user terminal includes chips, modules, antennas and other basic products, as well as terminal products, application systems and Application services. The Beidou system has been continuously improved in the overall design of the satellite, the on-board atomic clock, and the power supply security of the satellite platform

the payload of navigation satellite is the key to realize the navigation function. Its technical level, quality and reliability directly affect the function of the navigation system. Payload features include: onboard high-precision and high stability atomic clock technology, satellite time-frequency reference precision management technology, satellite ground two-way time comparison technology, time-domain and frequency-domain joint anti-interference technology, navigation signal anti space environment design technology in complex space environment, etc

the main structure of the satellite adopts a rectangular box structure composed of a central bearing tube and a honeycomb sandwich plate. The power supply and distribution bus of the satellite system is configured as a double independent primary power supply bus, which can be paralleled through instructions if necessary. The power supply safety design of the whole satellite has been strengthened, the power supply interface and internal safety requirements of power supply equipment, cables and load equipment have been clarified, and the safety requirements for backup redundancy status have been clarified. Atomic clock is the core of satellite navigation system. By adopting the special thermal control design of the rubidium clock cabin, the temperature of the high-precision rubidium atomic clock on the satellite is guaranteed to meet the requirements that the temperature change is less than ± 0.5 ℃

accurate and safe clock source

ensure the time benchmark of power equipment

the application of computer monitoring system, protection device, fault information management system, safety automatic device, energy billing system and other automatic equipment for power plants, substations and power dispatching requires high time precision. With the rapid development of power system, the requirement of time synchronization is becoming higher and higher. An accurate and safe clock source is needed to provide accurate time reference for all kinds of operating equipment. Beidou satellite navigation system, as a global satellite navigation system independently developed and operated by China, provides a new technical means for the time synchronization of the power system, showing strong stability and security. The Beidou satellite synchronous clock equipment based on Beidou technology has been gradually applied to the power system, ensuring the stability and accuracy of the time synchronization technology of the power system, and showing relatively good technical characteristics

the electric time synchronization system based on Beidou satellite navigation has gradually adapted to the requirements of intelligent power construction and operation, realized the connection of electric time synchronization systems, and can build a time synchronization system that meets the needs of electric intelligent operation, so as to realize the time synchronization system group and centralized monitoring and maintenance of power generation, transmission and distribution networks, and provide a safe and reliable unified time benchmark for the power system

the Beidou satellite navigation and positioning system can realize real-time data monitoring of the substation, and the data transmission is stable. Because the Beidou system has a communication function that GPS does not have, the communication module based on the Beidou satellite system can provide a variety of communication interfaces, which can be connected to the master station through optical fiber, and can also communicate with the master station and other communication modules through wireless transmission. Beidou communication is applicable to the condition monitoring of transmission lines in severe weather areas, as well as the emergency rescue dispatching information communication of transmission lines in response to natural disasters such as typhoons and earthquakes

the "three-step" development strategy of the Beidou satellite navigation system:

step 1: build the Beidou-1 system

(Beidou satellite navigation test system)

● in 1994, start the Beidou-1 project

● in 2000, launch two geostationary orbit satellites, complete the system and put it into use to replace the qualified steel balls selected with micrometers; (3) The error of the indentation measuring device is too large to provide services for Chinese users

● in 2003, the third geostationary orbit satellite was launched to enhance the system performance

step 2: the beidou-2 system was built to remove calcium salt and protein ● in 2004, the beidou-2 project was started

● by the end of 2012, 14 satellite launch teams were completed to undertake the navigation, navigation and Service such as time service

step 3: build beidou-3 system by relying on the upstream and downstream cooperation mechanism of new aluminum materials

● in 2009, start the construction of Beidou global system

● in November 2017, beidou-3 satellite began to launch

● by the end of 2018, complete the basic system of 18 satellites

● by the end of 2020, complete the system of 30 satellites, Serving the world

[extended reading]

the atomic clock is the most accurate timing tool in the world at present. It uses the electromagnetic wave emitted when atoms absorb or release energy to time. The elements used in atomic clocks are hydrogen, cesium, rubidium, etc. The precision of atomic clock can reach one second every 20million years. Among Beidou satellite signals, time information is the most important control information and positioning basis, and the equipment to maintain the satellite time accuracy is the atomic clock. Without an atomic clock, there would be no global navigation system

the atomic clock is the heart of the Beidou satellite navigation system. It provides a highly stable time and frequency reference signal for the satellite system and determines the accuracy of the navigation positioning, speed measurement and timing of the navigation system. The working principle of the atomic clock involves many disciplines such as quantum mechanics, electricity, materials science and heat science, and each index is demanding

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