The concept of PTN includes positioning, navigation and time service. Generally, it refers to a comprehensive information service based on unified spatiotemporal reference network and different communication networks, which can provide real-time dynamic, spatial location and time service for all kinds of users independently or in combination with mobile terminals. Beidou three generation system is to provide global PTN application services. Its feature is that the information has been expanded from 120 Chinese characters to 1000 Chinese characters, realizing high-precision positioning above centimeter level.
This year, Beidou system has been used in Hubeis epidemic prevention and control, such as the site selection of huoshenshan and leishenshan hospitals, the allocation of hospital materials and living goods, including UAV delivery and hospital drug delivery robots. Beidou navigation and positioning are also used for parking of common people. Integrated positioning is realized on mobile phones through satellite positioning of equipment, indoor sensor and signal positioning.
During the epidemic period, Wuhan also applied Beidou system and transportation big data to establish Wuhans smart city transportation system, realizing the effective management of 3.5-4.5 million vehicles and more than 60000 roads. This year, we also used Beidou technology to make an epidemic tracking software to automatically generate health codes on mobile phones. It can be said that Beidou supported Hubei people in successfully fighting against the new coronavirus epidemic.
For example, the service content of PNT is a point positioning, a line is navigation, and time service is also a time point. It does not cover various elements of the earths surface, and there is no way to provide the target information and area information represented by images and videos. In the future, real-time navigation enhancement should be done, and precise timing, fast remote sensing, and integrated mobile broadband communication services should be provided. In the future, we need to solve eight core technical problems, such as intelligent earth observation technology, new methods of earth navigation and positioning, establishment and maintenance of earth space-time benchmark, space-time environment, satellite resource organization and scheduling, network communication and security, intelligent satellite platform and payload, etc.
Now we are developing a Beidou application software, which integrates 12 kinds of positioning information together to provide services on mobile app. This system can be applied to the hospital to realize the tracking, processing and automation of the patients equipment. If such a system is applied to the mobile phone, the mobile phone will become an intelligent assistant. If an old man falls down outside, the mobile phone can tell the doctor when and where to fall down. It can also be applied to the Internet of things to locate the charging pile position, so as to ensure the charging safety of new energy vehicles.
It can also make high-precision navigation and positioning map to realize intelligent driving. Beidou can solve the intelligent problem of road measuring system. When the car is on the road, the signs on the road are for people to see. Therefore, the key to realize intelligent driving is to build a road measuring system with Beidou.
From the perspective of current demand, China can not wait for the development of PNT to pntrc, and build Chinas independent space-based information real-time intelligent service system with integrated communication, navigation and remote control. China should seize the time to do a good job in basic research and application.
In the future, the demand of PNT will move towards real-time and instantaneous, from static to dynamic and high-speed, from rough to accurate and complete, from outdoor to indoor, from land to ocean and sky, from region to wide area and global. Beidou application will also integrate mobile Internet and intelligent manufacturing into one, which will go deep into all fields of economy and peoples life.
Liu Jingnan, academician of Chinese Academy of Engineering: Beidou can realize global two-way communication
Positioning and time service are absolute position concepts related to the origin in space and time respectively, while navigation is a relative space-time measurement concept in space and time. Beidou system is the only satellite navigation system in the world that realizes the integration of communication, navigation and remote control.
The performance advantage of Beidou system is multi-function, global short message communication can be used for search and rescue. Navigation positioning + global two-way communication can quickly inform the caller of rescue arrangements. There are also remote sensing applications, such as active remote sensing, equipped with satellite borne space environment remote sensing and ionospheric anomaly remote sensing load; passive remote sensing, electromagnetic wave through the atmosphere, ocean, land reflection or diffuse reflection remote sensing of atmospheric water vapor, ocean water level.
Beidou is the only satellite navigation system in the world that declares the service accuracy of standard position is better than 5 meters. Beidou-3 three types of different orbit satellites have realized inter satellite self-organized ranging and data transmission. Ka band link is adopted, which has high ranging accuracy and wide communication frequency band, which is far better than UHF link. Laser link will be used in the next generation to achieve more accurate ranging.
At present, beidou-3 inter satellite link has been fully started, and the effect is remarkable. The precision of beidou-3 inter satellite link is the highest in GNSS, which ensures the high service precision of standard pnt. There are two medium earth orbit satellites of Beidou System in each of the three orbital planes, which ensure that the global area can receive the UHF band distress signals from the rescuers, and then transmit them to the international search and rescue center. All 24 medium orbit satellites can receive the search and rescue signals from the international search and rescue center and notify the rescuers, and at the same time, they can send relevant rescue short messages to the rescuers.
According to the advantages and characteristics of Beidou, how to use it to carry out application? It is necessary to integrate communication, navigation and remote control, make full use of Beidous multi band navigation signal advantages, carry out multi-purpose or dedicated high-performance and low-cost pnt research and development, improve the service capability of PNT, make full use of inter satellite link ranging, research or separate different orbit and different types of satellite systems, make full use of the global and Chinas peripheral short message two-way service ability, expand the service connotation, and develop image and voice transmission , video transmission and other methods to form patents, give play to the two-way communication and pnt integrated service function, use the integration of communication, navigation and remote sensing, develop multi-task and multi-objective collaborative intelligent scheduling emergency application, make full use of L-band and S-band carrier of Beidou GNSS satellite as remote sensing radiation source, and develop new remote sensing, especially target remote sensing.
The two-way link positioning and time service of Beidou RDSS can greatly improve the anti-interference and anti deception performance of Beidou Positioning and time service. The two-dimensional positioning accuracy of RDSS has reached about 10 meters. Compared with the one-way passive receiving mode, the time service accuracy can be doubled to about 10 nanoseconds. For some users who do not require too high time comparison frequency but require higher absolute time accuracy, such as finance and communications Information, blockchain platform, emergency rescue command center operation and control platform are the most in demand, which can expand this kind of absolute time service service with high anti-interference requirements.
With the bidirectional communication function of RDSS, a shared multi department collaborative scheduling system can be developed, such as an integrated intelligent operation control platform.
Chinas one belt, one road, is a strong backwardness and development potential. The innovative design, service capabilities, precision advantages and robust operation of Beidou 3 are well accepted by the countries and regions along the belt. It is worthy of the reputation of Chinas Beidou, the Beidou of the world and the first-class Beidou, which embodies the idea of Beidou navigation and sharing the world.
As a space-time technology, Beidou system is not only the perception and cognition of the earths resources and environment and its dynamic change information, but also the core foundation for realizing the accurate space-time and allocation management of the perceived objects. The first focus of Beidous development and application is to give other technologies, such as information, network, energy, resources, environment, transportation and other technologies, with the perception and cognition of precise space-time position, so that they can be upgraded to the stage of intelligent management and control, and realize the spatiotemporal intelligence of management and control process.
Another key point of Beidous application is to comprehensively develop its advantages of integration of communication, navigation and telecontrol, and give full play to its space intelligence function of cross technology, cross field and even cross space. The future goal is to study the natural intelligence of PNT and develop intelligent pnt technology to develop new applications.
Tan Shusen, academician of Chinese Academy of Engineering: 5g in China will succeed, and 6G will certainly succeed
What is spatial datum? The space datum is used to determine the orbit parameters, connect the coordinate origin and the earths rotation parameters to construct the GNSS space datum. China Beidou space datum and China Geodetic coordinate system are the same coordinate frame. I think there are only two practical global benchmarks, one is GPS time-space benchmark, the other is Beidou space-time benchmark. Spatiotemporal benchmark is the basic condition for the Internet of things to upgrade. Without a unified spatiotemporal benchmark, it is difficult to imagine how things connect with each other.
The development of Beidou system is a course of continuous innovation, pioneering and enterprising. The main achievement of Beidou-1 is that the two satellites have realized large-scale and high-precision positioning and time service. It covers China and its surrounding areas. According to the principle of GPS positioning, it needs 12 satellites, and the two-way time service accuracy is 10ns, which is internationally leading. Positioning and message communication can be completed within one second, which has become the highlight of international navigation tracking and life rescue. Positioning and reporting are completed at the same time on the same channel. Users know where I am, and the command department knows where we are. Positioning report is the biggest feature of Beidou which is different from GPS.
Beidou is the worlds first navigation system with complete tri band service capability. In 2012, it will broadcast the navigation and positioning of B1, B2 and B3 frequencies in all constellations. It is difficult to predict when GPS will complete tri band navigation. It was said to be completed in 2020, but it is not clear which year it will be completed. Beidou is the worlds first continuous navigation and positioning report dual-mode integration system, dual-mode user computer has played a huge social and economic benefits.
The main achievement of beidou-3 is the independent construction of global space-time benchmark. Why can we say that only beidou-3 can be regarded as China providing the global space-time reference for satellite navigation? Because only the global system can have a representative description of the global system, and those regional systems do not have the ability to construct space-time benchmarks, so the beidou-3 system has actually completed the navigation from the first stage to the fourth stage, so the achievements of Beidou are trans generational.
Beidou-3 has six major functions, including basic navigation as the foundation, integrating SBAS, PPP, MSS, etc., and enhancing accuracy, integrity and information, which will better serve all kinds of users. Beidou MMS is short message communication, which adopts RDSS mode. Beidous inter satellite link is actually the sharing of global mobile communication system in China. It is not only the bidirectional data link of global mobile communication, but also the system of clock difference between Chinas space-time satellites, and can be further extended to the maintenance system of space-time benchmark.
Chinas Beidou has been built, basically in the l-frequency meter level navigation accuracy level. In 2030 or 2035, a space system with deep integration of navigation, communication and remote sensing will come from China. Chinas high-speed space network plus 5g ground network will realize the interconnection of ground objects and objects in the global sky, that is, the sixth generation mobile communication. The road taken by 6G China is different from that of western countries. China builds ground system first and then space system. Chinas space system is Based on the Beidou space-time benchmark, Chinas 5g will succeed, and Chinas 6G will also succeed.
There will be Beidou global Internet of things in the future. The Internet is the connection between people, and people are very inclusive. In order to realize the interconnection of global dynamic things and things, we must maintain the space-time benchmark to realize the global Internet of things. The static centimeter level and dynamic decimeter level world-class satellite navigation system has been realized in the beidou-3 system. It provides the space-based Internet of things with unified space-time reference, and obtains the space-based radio global system for earth cognition. In the future, the Beidou space-based Internet of things module will realize the interconnection of space things and space things, and the Internet of things between space things and earth things, and the mission will surpass the means of earth navigation The research of. Its significance is to give full play to the fundamental value of Beidou space-time benchmark, break the state of independent construction industry of world navigation, communication and remote sensing, and provide public data link for most industries, including remote sensing.
In a word, Beidou multi service satellite radio system is an important national space information infrastructure. The integration and innovation of beidou-3 in basic navigation, satellite based enhancement, precise single point positioning, message communication and international search and rescue services is a good start for future development. The Beidou space-time reference link and high-speed data link will become the intelligent highway of Chinas space system.
Beidou application in life
In 2019, the total output value of Chinas satellite navigation and location service industry with Beidou application development as the core reached 345 billion yuan. Compared with that when Beidou just provided services in 2012, the total output value increased by 4 times. With the deepening development of Beidou + and + Beidou, the associated output value driven by the epidemic situation was as high as 228.4 billion yuan, indicating the integration of Beidou application and industrial development in China Ecology has taken shape.
In addition, in recent years, the innovative application of Beidou has been deeply integrated into the transformation and upgrading of many industries. Backbone enterprises in the fields of automobile, high-speed rail, energy, minerals, postal, mobile communications, transportation logistics, Internet services and other fields are actively + Beidou development, becoming a new force in the industry, thus greatly promoting the overall development of Chinas satellite navigation and location-based service industry The contribution of economic benefits of the industry has been significantly improved. Beidous overseas application cooperation and trade exchanges are also more frequent. Beidous land ownership confirmation, precision agriculture, intelligent construction, and smart port have been successfully applied in ASEAN, South Asia, Eastern Europe, West Asia and Africa. In the future, one belt, one road and other national strategies will be developed and promoted. Beidou technology application and space-time services will become more popular. It will integrate with 5G, Internet of things and big data. It will further change peoples lives and show a broader application prospect. Coca Cola will stop production of coconut water brand Zico or give up some cola varieties. Korean government, family and enterprise debt of the three major economic entities all set a new record? Source: surging news editor: Zhong Qiming_ NF5619
In addition, in recent years, the innovative application of Beidou has been deeply integrated into the transformation and upgrading of many industries. Backbone enterprises in the fields of automobile, high-speed rail, energy, minerals, postal, mobile communications, transportation logistics, Internet services and other fields are actively + Beidou development, becoming a new force in the industry, thus greatly promoting the overall development of Chinas satellite navigation and location-based service industry The contribution of economic benefits of the industry has been significantly improved. Beidous overseas application cooperation and trade exchanges are also more frequent. Beidous land ownership confirmation, precision agriculture, intelligent construction, and smart port have been successfully applied in ASEAN, South Asia, Eastern Europe, West Asia and Africa.
In the future, one belt, one road and other national strategies will be developed and promoted. Beidou technology application and space-time services will become more popular. It will integrate with 5G, Internet of things and big data. It will further change peoples lives and show a broader application prospect.