"Can the vehicle use the Beidou system to achieve one or two meter accuracy and second-level error navigation?" an audience asked.
Yang Changfeng said frankly that there is still a gap in the positioning accuracy and reliability of the Beidou system alone, but with a more powerful foundation enhancement system, vehicle-to-vehicle coordination, and the construction of lane auxiliary facilities, lane-level recognition can be achieved, and even unmanned drive.
After a few conversations, the "high-cold" Beidou system seamlessly connects with daily life.
Recently, the National Committee of the Chinese People's Political Consultative Conference's major special work committee's publicity group held a publicity report meeting in Beijing, and the National Committee of the Chinese People's Political Consultative Conference Yang Changfeng gave a presentation on the topic of "Beidou Satellite Navigation System Construction Development and Convergence Application".
As the chief designer of Beidou satellite navigation system engineering, Yang Changfeng participated in and witnessed the course of China's Beidou overcoming difficulties.
The overall output value of the satellite navigation and location service industry has an average annual growth of about 20%
Yang Changfeng said that in the history of human navigation, satellite navigation integrates global space and time information service capabilities for the first time, and at the same time solves a series of problems such as high precision, high dynamics, real-time, global and all-weather, and realizes space and time. Organic unity of information.
He explained the principle of satellite navigation in a simple way: based on the principle of the convergence of three spheres, by measuring the distance between more than 3 navigation satellites and the user’s receiver, the user’s three-dimensional position coordinates are calculated. "It sounds mysterious, but we do navigation. Everyone will understand as soon as you say it." He said with a smile.
The construction of a high-performance and highly reliable global satellite navigation system is one of the 16 major special projects of my country's mid- and long-term development plan in the field of science and technology. It took nearly 30 years to build. The Beidou system is by far the largest in my country, with the widest coverage and service performance. The tallest, huge and complex space system most closely related to people's lives.
"The Beidou system is a "world-wide network" composed of working satellites in the space segment, ground segment, user segment, more than forty ground stations, and thousands of user terminals." Yang Changfeng said.
The status of "this network" is self-evident. As an important support for the country's economic and social development, the Beidou system is the third largest economic growth point after mobile communications and the Internet. In the past 10 years, the overall output value of my country's satellite navigation and location service industry The average growth rate is more than 20%, and the output value in 2020 is expected to exceed 400 billion yuan.
The global positioning accuracy is equivalent to GPS, and the local area is better than GPS
In addition to the "growth history" of the popular science Beidou system, Yang Changfeng also answered questions on the spot and answered the "cold knowledge" about Beidou.
How does Beidou perform compared to GPS systems?
"Beidou is the most powerful global satellite navigation system." Yang Changfeng said that the Beidou system has created three orbital hybrid constellations, adding precision single-point positioning, satellite-based enhancement, regional short message communication, international search and rescue, and global short message. New functions such as communication can broadcast better navigation signals.
"The global positioning accuracy is equivalent to GPS, and the local area is better than GPS."
For example, in North America, Africa, Europe and other places, Beidou's positioning accuracy is about 5 meters, and in the Asia-Pacific region it can be accurate to 2.5 to 3 meters.
In addition to real-time navigation and rapid positioning, the Beidou system also has features such as position reporting and short message communication.
As Yang Changfeng said, the Beidou service is by your side, "This is the most powerful part of the Beidou system. As the most advanced navigation system in the world, its application is only limited by the human imagination."
Especially the short message service that can "send short messages" with the Beidou system is not available in any other global satellite navigation system abroad.
Yang Changfeng revealed that by the end of the year, it is expected that Huawei mobile phones with added short message function will be released, and lane-level navigation may also be carried.
"Beidou is the representative of Chinese wisdom." He concluded.
Star-to-earth interconnection
Yang Changfeng said that the Beidou system has inter-satellite links to achieve inter-satellite and satellite-to-ground interconnection.
He further explained that the Beidou-3 system uses the Ka-band phased array link to organically connect 30 satellites with dozens of domestic ground stations, which greatly improves operational capabilities, safety and positioning accuracy, and directly provides spacecraft Measurement and control data transmission service.
More importantly, without ground support, the satellite can realize autonomous operation for 60 days, and the uplink and downlink are not interfered by the atmospheric ionosphere, and the positioning accuracy is significantly improved.
In the 9.3 military parade on the 70th anniversary of the victory of the Anti-Japanese War, the ground team's time error was only within 0.3 seconds, the distance error was within plus or minus 10 centimeters, and the air echelon was not bad in meters, all thanks to Beidou.
This "unique skill" is also one of the reasons that makes Beidou the strongest satellite navigation system.
"Beidou core" is "Chinese core"
After years of development, Beidou has formed a complete industrial chain, basic products have achieved independent controllability, domestic Beidou chips, modules and other key technologies have comprehensive breakthroughs, and performance indicators are comparable to similar international products.
A variety of Beidou chips have achieved large-scale applications, with a process level of 22 nanometers.
Speaking of the "Beidou core" that has received the most attention, Yang Changfeng said bluntly, "It can be called all Chinese chips," and "Beidou chips are of the same magnitude as the basic level abroad."
"It's all done by myself," he said. The ground is also entirely Chinese core. In the future, power consumption will be lower and accuracy will be higher.
On July 31, 2020, the Beidou-3 global satellite navigation system was completed and officially opened for service. This marks that China's self-constructed and independently operated global satellite navigation system has been fully completed, and China Beidou has opened a new chapter in high-quality global service.
But this is not the end of Beidou system construction. According to Yang Changfeng, the design life of a Beidou navigation satellite is 10 to 12 years. Judging from the experience of Beidou II, the satellite can serve for 12 to 14 years, and then enter the "grave." Orbit" will be replaced at that time.
Before 2035, my country will build a more ubiquitous, more integrated, and smarter national integrated positioning and navigation timing system to provide core support for future intelligent and unmanned development, continue to promote system upgrades, and build benchmarks that cover the sky, ground and sea. A unified, high-precision, high-intelligence, high-security, and high-efficiency spatiotemporal information service infrastructure.
Serve the world and benefit mankind!
The CPPCC Major Special Working Committee Propaganda Group is an innovative exploration of the CPPCC’s in-depth study and implementation of Xi Jinping’s thoughts on socialism with Chinese characteristics in the new era, and deepening the practice of General Secretary Jinping’s important thinking on strengthening and improving the work of the CPPCC.
This year, the propaganda team will go to the National Committee of the Chinese People's Political Consultative Conference on themes such as the decisive victory in building a well-off society in all respects, the decisive battle against poverty, the overall promotion of epidemic prevention and control and economic and social development, the implementation of the "13th Five-Year Plan" and the finalization of the "14th Five-Year Plan" development. The cadre training center and the local CPPCC carried out preaching activities.
Some members of the National Committee of the Chinese People's Political Consultative Conference in Beijing, members of the Chinese People's Political Consultative Conference, cadres of the Chinese People's Political Consultative Conference, and student representatives of the "Simulated CPPCC" social practice activities participated in this presentation.
Science and Technology Daily reporter Cui Shuang