As is known to all, the Beidou navigation system is independently developed and operated independently by China. It is the third mature global navigation system after the US GPS and Russia's GLONASS. The EU Galileo system has been recognized as the world's four major navigation systems by the United Nations Satellite Navigation Committee. .
It was born in the military and matured in civilian use. The strategy of "three steps" is not urgent:
The first step is to establish a Beidou satellite double-star positioning test system to form regional active positioning and navigation service capabilities;
The second step is to complete the launch of more than ten satellites in three orbits, build a regional navigation system, and form regional passive service capabilities to provide positioning, navigation, timing and short message communication services to the Asia-Pacific region;
In the third step, a global global Beidou global satellite navigation system consisting of five geostationary orbit satellites and 30 non-geostationary orbit satellites is built to form a global passive positioning service capability.
With the successful launch of the 23rd Beidou navigation satellite in June this year, the first two steps of the three-step strategy have been drawn to a successful conclusion. At present, the core technologies of the global network are all overcome, and the system service capability is further improved, which can provide real-time positioning services for meters and meters. It now covers 1/3 of the world's land, benefiting 4 billion people in the Asia-Pacific region, and the accuracy is not lost to GPS.
This "heavy instrument of the country" gradually shows the potential to serve the world. Beidou system has become a veritable "Made in China" spokesperson by virtue of its status and honor in the world's science and technology competition.
The author also came to talk about why China has to build its own Beidou since it has US GPS and Russian GLONASS.
Why does China still have to build its own Beidou?
The satellite system bears the foundation of national information and communication and is the lifeblood of many military and civilian fields.
As for the urgency of Beidou navigation, time is money for ordinary people, and time is life for the military, and time is fat for the country. The chief designer of Beidou satellite navigation system said that he could not help but feel how we can allow this high-rise building related to national security to be built on the foundation of others! So in order to realize our own mastery of destiny, we must set up our own time and space benchmarks and have the right to speak against them.
First of all, the technical breakthrough is another big point of the Beidou navigation system.
Beidou is the first hybrid constellation built by the three geostationary satellites of the geostationary orbit, the inclined geosynchronous orbit, and the medium-earth orbit. This design idea can be so innovative in addition to the “primary stage of characteristic socialismâ€.
The second is compatible interoperability. This will bring a lot of benefits to the user, because the user can receive more navigation satellite information at the same time, it is more convenient to solve his position, speed and time, and the accuracy is higher. After the Beidou system is compatible with other systems, you can use the Beidou when the Beidou signal is strong, use GPS to help you correct, and help improve the navigation service accuracy. As early as a few years ago, many companies have begun to try to manufacture receivers that can receive Beidou, GPS and GLONASS systems. The realization of the interconnection and interoperability of the four major systems will also be the general trend in the future. However, due to the constraints and influences of major issues such as military secrets, the integration problem has been difficult and progress has been slow.
So the earth is no longer round, but a plane with fast information.
Third, one of the goals of the Beidou navigation system is to build active navigation positioning in 2020 and to have short message functions. These two advantages are currently not available in GLONASS and GPS.
The passive positioning of the GPS means that the user can receive the positioning signal of the satellite without transmitting any signal. On this basis, Beidou also has active positioning, that is, users send their own location reports to the satellite network or command and control center to achieve two-way positioning. Beidou is big, please allow iot101 to dare to ask: Is this function not tailored for this troubled land? ?
Count a question: Beidou + Internet of Things =?
Smart City
We don't talk about the military field who masters the advantages of satellite navigation, whoever has the initiative to control the war, it is closely related to our lives. The precise improvement of Beidou's positioning will be the catalyst for the construction of smart cities and the development of smart transportation in China.
1. The breakthrough of active positioning technology is a special task in special dispatching and commanding work!
Active positioning is just like the bus's dispatch room. We can know immediately where you are, how long you have been in the past. Beidou cannot help build geological disaster monitoring systems such as earthquakes and tsunamis, and it can provide timely communication and dispatch in rescue work.
In the event of a geological disaster such as an earthquake or tsunami, Beidou Navigation can not only provide navigation and positioning information to the inspection station, but also detect the disaster in the area in real time by receiving sensor information, while using the ground communication system or the blind area without communication signals. The message sending function of Beidou Navigation timely reports the progress of the disaster.
For example, in the 2008 Wenchuan earthquake disaster, the Beidou navigation system provided accurate positioning and tracking for the rescue troops, providing a strong guarantee for the life channel. Then, in the continuous optimization and upgrading of Beidou navigation system, its signal frequency and transmission capacity are further strengthened, which is an indispensable technical support for emergency situations such as fire fighting, command, disaster prevention and rescue.
2. Strengthen the communication network in remote areas: forest fishery
In recent years, Japan, South Korea, the Philippines, Vietnam and other countries have frequently encountered conflicts with Chinese fishing boats and have become diplomatic events. Therefore, the monitoring needs of fishing vessels in China and surrounding seas are extremely urgent.
Beidou combines webgis technology with shore monitoring stations and Beidou navigation shipborne terminals to achieve accurate ship positioning display and information feedback, providing important evidence for diplomatic events and guiding fishing boat rescue command in emergency situations. The offshore waters can be combined with the road station base station + Beidou navigation dual communication signals, while in the offshore waters, information transmission can only be achieved through the Beidou satellite communication signals. So at this time, the key message of 120 words is particularly important.
In addition, in the different sea areas of the offshore and the distant sea, Beidou navigation can achieve the same routine applications as chart navigation, sea state information, cross-border prompts, information transmission, real-time scheduling, and path planning.
Although the above is not a "smart city" matter that we usually understand, disasters and sea areas are part of our country's urban construction. It is also the sentence: those who commit me in China, though far away!
3. Draw a pair of shining eyes to the drone:
In the professional application field, the UAV relies on people to command the remote control. Many functions cannot be realized. By installing the Beidou positioning on the UAV, more flexible control can be realized, and thus many technical problems can be solved. It is worth mentioning that many UAVs can now be positioned by GPS and Beidou double-melting technology. When the fog is serious and the GPS cannot be positioned, the Beidou can be positioned. The Beidou system is like the eyes of a drone. Its system features are:
High positioning accuracy - based on Beidou high-precision GNSS receiver and satellite antenna, supporting Beidou, GPS, GLONASS three-system positioning.
High standard of operation - positioning accuracy 1cm, reciprocating combined line error 2.5cm
Wide range of operations - support a minimum of 5 km and a maximum of 50 km depending on the selected base station
Control automation - set up flight operations for drones and autopilot operations through terminal control systems
His applications range from agricultural plant protection, drone aerial photography, line inspections, and assistance to fire protection, public security, and disaster prevention.
Agricultural plant protection - set up work trajectory, carry out automatic flight control operations, improve work accuracy and efficiency
UAV aerial photography - customized aerial photography solution, the work track is seamlessly connected to improve work efficiency
Line inspection, fire rescue - develop inspection routes to reduce the intensity of personnel operations
Public security, disaster relief - to achieve the positioning and tracking of positioning targets, and reduce human casualties.
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