BeiDou Navigation Satellite System (BDS)

 

GPS / China says BeiDou navigation satellite system is completely function now

  

 Live: China issues The White Paper on China's BeiDou Navigation Satellite System in the New Era 

 

 China's State Council Information Office releases The White Paper on China's BeiDou Navigation Satellite System in the New Era and invites Ran Chengqi, director general of the China Satellite Navigation Office and spokesperson of BeiDou Navigation Satellite System, as well as a spokesperson of the State Council Information Office to introduce the white paper. #OfficialRelease 

 

China releases white paper on BDS, outlines development in new era

 File photo of a model of the Beidou Satellite Navigation System.Photo:Xinhua

 

 
China issued a white paper on the country's BeiDou Navigation Satellite System (BDS) on Friday.

"China's BeiDou Navigation Satellite System in the New Era," the white paper said that BDS has been built into a world-class navigation system. It laid out how China plans to refine the system by improving its operation management, promoting sustainable development of BDS-based applications, and upgrading its governance in the coming years.

The white paper noted that BDS is dedicated to the world, and China will step up international cooperation for better compatibility and interoperability between BDS and other navigation satellite systems.

China is committed to "building a comprehensive spatiotemporal system that is more extensive, more integrated and more intelligent on the next generation of BDS," said the document released by the State Council Information Office.

It pointed out that China is ready to share its achievements in developing BDS, and it will work with all other countries to promote the development of navigation satellite systems and make an even greater contribution to building a global community of shared future and a better world. 

 

All BDS-3 satellites working well, contributing to top-class navigation system with unique advantages: white paper

 

The China-developed BeiDou Navigation Satellite System (BDS) has become a top-class system with cutting-edge technologies and powerful functions, according to a white paper released Friday. China is ready to share its achievements in developing the BDS and provide services to all other countries, it said.

Titled "China's BeiDou Navigation Satellite System in the New Era," the white paper published by the State Council Information Office introduced how China plans to further refine the system by improving its operation management, developing BDS-based applications, and upgrading its governance in the coming years.

The 30 in-orbit satellites of the third-generation series of the BeiDou system, or BDS-3, which officially joined commissioning in July 2020, are in good operating condition, Ran Chengqi, spokesperson for the system, said at the press conference on Friday.

The millions of components of the satellites, in more than 300 categories, are all domestically produced with excellent performances, Ran said.

Data showed that the global positioning accuracy of BDS-3 is within 5 meters, with the performance in the Asia-Pacific region even better. In general, the service performance of BDS-3 is better than the designed index, the spokesperson said.

The system offers six special services, namely international search and rescue, global short message communication, regional short message communication, satellite-based augmentation, ground-based augmentation, and precision single-point positioning.

It is the world's first navigation satellite system to provide a global short message communication service, the white paper noted.

"The 100 percent independent development and operation of BDS core components has laid a solid foundation for its wide use," it said.

Chinese experts said that compared with GPS and GLONASS, the BDS has its own advantages in navigation, positioning accuracy, timing, speed measurement, and short message transmissions.

Song Zhongping, a space expert and TV commentator, told the Global Times on Friday that the BDS offers the global short message communication service, which is unique in the world.

BDS has achieved global coverage with world-class accuracy. China will continue to improve the reliability, accuracy and safety of the BDS by deploying more satellites next year, Song said.

BDS is also dedicated to the world, Ran noted at the conference, noting that China will step up international cooperation for better compatibility and interoperability between BDS and other navigation satellite systems.

It has signed signal interoperability statements with GPS and GLONASS, and is discussing cooperation with the Galileo system. Under the framework of the United Nations, China promoted the realization of multi-system compatibility and sharing, so as to jointly provide more high-quality and diversified, safe and reliable services for global users.

BDS has established cooperation mechanisms with organizations and countries in Asia, Africa and Latin America, with more than 50 documents signed since 2016.

The white paper pointed out that China is ready to share its achievements in developing BDS, and it will work with all other countries to promote the development of navigation satellite systems and make an even greater contribution to building a global community with a shared future.

BDS provides many services for the Belt and Road Initiative and friendly countries, including transportation in the civilian field, urban surveys, urban planning, aircraft navigation and so on, Song said. "Whatever GPS can do, BDS can do it as well."

According to Song, another way of cooperation is setting up dual-mode navigation systems. For example, on a certain chip or a certain system, there can be both GPS navigation and BDS. "This switching mode makes the navigation more secure and reliable."

China will further upgrade BDS technologies, functions and services. The goal is to create a comprehensive spatiotemporal system that is more extensive, integrated and intelligent, and that provides flexible, smart, precise and secure navigation, positioning and timing services.

In building a more powerful BDS, China will create its own smart and distinctive system for operation, maintenance and management.

China began to develop its own navigation satellite system in 1994. BDS-1 entered service and began providing positioning services in China at the end of 2000. At this point, China became the third country in the world with a navigation satellite system. BDS-2 was completed in 2012, providing passive positioning services to the Asia-Pacific region.

In less than three years, 18 rockets sent 30 satellites into orbit, a pace unmatched by any other country. In 2020, BDS-3 was formally commissioned to provide satellite navigation services worldwide. 

 

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 Tech Breakdown

Hoaw to use BeiDou navigation system on your phone

 

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 Beidou Grows into World-class Navigation System in Terms of Accuracy: Chief Designer

  

 

 

 

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How to use BeiDou navigation system on your phone

China has just announced the completion and launch of its BeiDou-3 Navigation Satellite System. But, how can we use it?

CGTN recently posted a video showing the differences between China's BeiDou system and other global navigation satellite systems.

Read more: How is China's BDS different from other global navigation networks?

And we received some questions, about how to actually use BeiDou for navigation. This video explains how the system works on your phone.

Before we get started, let's clear up a common misconception. A lot of people think if you want to use the BeiDou system, you need to download some sort of "BeiDou apps."

The truth is, you don't need to download any new app for using the system. If you find an app titled "BeiDou" in an app store, it's not official. Regular navigation apps, delivery apps or car-hailing apps are all able to use the positioning service of the BeiDou system.

Civil equipment like our phones, cannot choose which navigation system to use. It will automatically pick the system that has best signal at that time.

So maybe you're using the BeiDou system right now.

But not every smartphone supports BeiDou. Currently, most of the Android phones can use the BeiDou system. But if you are an iPhone user, you are not able to use it because chips carried by the Apple product line do not support the system. To check, you can take a look at the tech specs of your phone.

GPS testing apps can show the number of satellites in your area and their signal strength. /Screenshot via GPS Test

Another way to find out whether your phone supports BeiDou is through GPS testing apps. Your phone can use BeiDou's services if the app can detect BeiDou's satellites.

There are also people asking whether BeiDou can be used outside China. You can do so just like we can use GPS services in China.

The difference is that BeiDou provides better accuracy in China and the Asia-Pacific region, at five meters, because of its unique layout. The accuracy in other areas is about 10 meters.

Cameraman: Yang Yang Video editor: Guo Meiping Cover image: Jia Jieqiong

How is China's BDS different from other global navigation networks?

https://youtu.be/NXdFg1PRKnQ

China has completed its BeiDou Navigation Satellite System, or BDS, becoming the fourth country in the world with a global navigation network, the other three being GPS of the U.S., GLONASS of Russia and Galileo of Europe.

As the name suggests, the global navigation satellite system provides navigation and location services on a 24-hour basis. From what we know so far, building a sound satellite system costs a bundle. Besides, the other systems are already well-established. So, what makes China's BDS stand out among its competitors?

Firstly, the other systems have 24 satellites in medium earth orbit (MEO). In addition to the 24 satellites, the BDS constellation also has three satellites in geostationary earth orbit (GEO) and three in inclined geosynchronous orbit (IGSO). What's special about the extra six satellites is that they have a relatively fixed range of activity.

This layout can enhance BDS' accuracy in China and the Asia-Pacific region to five meters, in comparison with a 10-meter accuracy in other areas.

Secondly, BDS has a trump card – the short message service. It is a function that allows users to have a two-way communication.

In areas not covered by cellular or communication signals, BDS can make the short message service available in uninhabited areas, such as deserts, forests, and mountainous or polar regions.

With this service, users in distress can inform the rescue team about their location and condition.

As the most populated country in the world, it's important for China to have its own global navigation satellite system to meet the needs of the country's socio-economic development.

In fact, the BDS is also good business. According to the White Paper on the Development of China's Satellite Navigation and Location Services Industry (2020), the country's satellite industry has maintained a 20-percent annual growth since 2012. BDS contributes about 80 percent of it.

The system has also generated tens of billions of dollars, countless high-paying jobs, and stimulated economic growth via big contracts in commercial industries.

And with improvements in functions, it will have much more to offer in the future.

Scriptwriter: Pan Zhaoyi Producer: Guo Meiping Cameraman: Fu Gaoliang Video editor: Zhao Yuxiang Cover image: Yin Yating

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China successfully sends final satellite of BeiDou system into space, completes China's GPS Network

https://youtu.be/RFyJy6bUjkI

China launches last piece of BeiDou Navigation Satellite system into orbit

China’s final BeiDou-3 satellite for its global navigation system was launched on June 23, 2020, at 9.43am, from the Xichang Satellite Launch Centre in the southwest province of Sichuan. A Long March 3B rocket carried the satellite into geostationary orbit, completing the third-generation network for the BeiDou Navigation Satellite System (BDS). BDS is the fourth major global satellite navigation system, following GPS built by the US, Russia's Glosnass and the European Union's Galileo.

"Ten, nine, eight…three, two, one. Launch," the calm voice of 01 Commander Yin Xiangyuan in the valley of Liangshan mountain in Southwest China's Sichuan Province, was soon overwhelmed by the thunderous boom of the rocket taking off on Tuesday.

Carrying the last satellite of China's domestically developed BeiDou Navigation Satellite System, or BDS, the Long March-3B launch vehicle blasted off from the Xichang Satellite Launch Center on Tuesday morning.

And after a flight of around 30 minutes, the spacecraft, the third geostationary Earth orbit (GEO) satellite and 30th of the third-generation series of the BeiDou system, or BDS-3, successfully entered its planned orbit, marking the completion of the global geolocation network, which is also China's largest space-based system and one of the four global navigation networks, along with the US' GPS, Russia's GLONASS and the European Galileo.

The launch of the final satellite of China's indigenous BeiDou system had been previously scheduled on June 16, but was delayed after technical problems were found with the Long March-3B rocket in pre-launch tests.

Space launches have always been full of challenges and sometimes faced with high risks of failure. The postponement of the final BeiDou launch and resumption after resolving the problems once again demonstrated that Chinese space scientists uphold the scientific spirit, allowing zero errors at any stage of the mission, insiders said.

Photo: Hu Xujie

World-class performance

The latest GEO satellite is the 55th BDS system, and will work with other members of the network, allowing global users to access high-accuracy navigation, positioning and timing as well as communication services.

Compared to previous generation series, the constellation of BDS-3 with an array of 30 satellites flying on three different orbit planes - three at the GEO, three at the inclined geosynchronous orbits, and 24 at the medium Earth orbit, have higher bandwidth, enabling enhanced communication capability and carrying more accurate and stable atomic clocks to improve the precision of timing and navigation services, according to the project contractor China Academy of Space Technology under the state owned space giant China Aerospace Science and Technology Corporation (CASC).

The BDS-3 also possesses better messaging capability, increasing its unique short message service capacity from 120 Chinese characters to 1,200 per message, and the higher communication bandwidth also expands the user capacity from 500,000 to 5 million users.

BDS-3 is also capable of providing precise point positioning service (PPP) with a decimeter-level dynamic accuracy and centimeter-level static accuracy, meaning it can support applications such as auto-pilot for vehicles and precision docking of ships.

Yang Changfeng, the chief architect of the BDS, told the Global Times on Monday that China's BDS is compatible with the US' GPS, Russia's GLONASS and Europe's Galileo, and users worldwide can freely choose any four satellites with the best signals from the global navigation satellite systems with over 100 satellites.

According to the chief architect, the BDS has satellites on three orbit planes in the Asia-Pacific region, which makes it more capable of resisting disturbances from occlusion even in such environments with multi-layer surfaces in the urban areas as well as in forests.

Users in low latitude areas in the Asia-Pacific region can enjoy non-stop navigation services from the BDS in these circumstances, and the accuracy of the BDS service is just as good as that of the US' GPS, and of world-class quality globally, Yang noted.

According to the China Satellite Navigation Office on Tuesday, the majority of the world have started using the BDS.

Photo: Hu Xujie

Hardwork of generations

China began research and development into the country's indigenous satellite system in 1994, aiming to reduce its reliance on foreign networks, especially under the complicated external environment.

The first BeiDou satellite entered orbit in 2,000, and started providing positioning, navigation, timing and messaging services to domestic users in China and users in the Asia-Pacific region in December 2012.

The BDS system started providing global services at the end of 2018, when construction of the BDS-3 primary system had been completed.

BeiDou has been supporting dozens of businesses and public sectors in China, ranging from transportation and agriculture to electric power transmission and fisheries, and tens of millions of BeiDou-enabled terminal devices have been sold and are in use.

In the field of transportation, BDS has been widely used in the monitoring and management of priority transportation, highway infrastructure safety, port scheduling, and real-time high-precision positioning.

By the end of 2019, more than 6.5 million road operating vehicles, 40,000 postal and express delivery vehicles, 80,000 buses in 36 central cities, 3,200 inland navigation facilities, and 2,900 marine navigation facilities have adopted BDS, forming the world's largest dynamic monitoring system for road operating vehicles.

More than 70,000 fisheries and law-enforcement vessels have installed BeiDou terminals and more than 10,000 people have been rescued thanks to the BeiDou application.

Time reference for public security networks has been synchronized based on the BDS timing services. BDS has played an important role in ensuring security at major events, such as the Asia-Pacific Economic Cooperation (APEC) Meeting and the G20 Summit.

In the field of smart phones, mainstream chip manufacturers both at home and abroad have introduced integrated chips that are compatible with BDS. By the third quarter of 2019, more than 400 smartphone models sold in China supported positioning functions, of which about 300 models supported BDS.

The scale of navigation satellite positioning and navigation industry in China has reached 345 billion yuan ($48.6 billion) by 2019, up 14.4 percent from the previous year, according to an annual industry report.

Cao Chong, a Beijing-based senior expert on satellite navigation industry, told the Global Times the industry scale is expected to exceed 400 billion by the end of 2020.

Cao said the next step to further promote the BDS system in market both at home and abroad lies in the research and development of terminal capabilities, which should keep up with the enhanced power of BDS-3. "There are huge market potentials to be released."

The Tuesday mission marked the 44th BeiDou satellite-launching flight for the Long March-3A rocket series since October 31, 2000, which the Long March-3B rocket belongs to. The rockets have sent 59 BeiDou satellites, including four experimental ones, into orbit, with a 100 percent success rate.

As the BDS system continues to develop, the Long March-3A rocket series have also started to use three-mode receptors which are compatible with the BDS, GPS and GLONASS networks, Jiang Jie, chief engineer of the rocket series, with the China Academy of Launch Vehicle, also under the CASC, told the Global Times.

As the three modes all complement each other, they work together to improve the orbiting accuracy of rockets and reduce consumption of propellants, Jiang noted.

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China's Long March-5 carrier rocket was successfully launched at the Wenchang Space Launch Center in South China's Hainan Province on Friday. Standing at an impressive 57 meters tall and with a diameter of 5 meters, the rocket will send a test satellite into planned orbit. The endeavor marks a significant leap forward since the carrier rocket's maiden mission in 2016 and through a failed attempt in 2017.

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The Long March-5 rocket, China's largest carrier rocket, was successfully launched from Wenchang Space Launch Center in south China's Hainan Province on Friday night.

The rocket lifted off at 8:45 p.m. Beijing time, carrying the Shijian-20 technological experiment satellite weighing over eight tonnes, the heaviest and most advanced communications satellite in the country.

About 2,220 seconds later, the satellite was sent into its planned orbit and the launch mission was declared a success.

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China's largest carrier rocket Long March-5 makes new flight

China launched the third Long March-5, the largest carrier rocket of the country, from Wenchang Space Launch Center in south China's Hainan Province on Friday evening.

The rocket, coded as Long March-5 Y3, blasted off from the coastal launch center at 8:45 p.m. (Beijing time), carrying the Shijian-20 technological experiment satellite weighing over eight tonnes, the heaviest and most advanced communications satellite of the country.

About 2,220 seconds later, the satellite was sent into its planned orbit.

Wu Yanhua, deputy director of the China National Space Administration (CNSA), declared the launch a success.

The success of the flight lays the foundation for a series of future space projects for the country including exploring Mars, returning moon samples and constructing its own space station, Wu said.

The Shijian-20 satellite will be used to test the key technologies of the DFH-5 platform, China's new-generation large satellite platform, and offer communication and broadcasting service, Wu said.

The Long March-5 is a large, two-stage rocket, capable of carrying a payload of 25 tonnes, equivalent to the weight of 16 cars, to low Earth orbit, 14 tonnes to geostationary transfer orbit, eight tonnes to Earth-Moon transfer orbit, or five tonnes to Earth-Mars transfer orbit, over twice the capacity of the current main Long March series rockets. Combined with an upper stage, the rocket is capable of sending probes to explore Jupiter and other planets in the solar system, according to the China Aerospace Science and Technology Corporation (CASC).

The Long March-5 made its maiden flight on Nov. 3, 2016 from Wenchang. However, the second large rocket, Long March-5 Y2, suffered a failure, as a malfunction happened less than six minutes after its liftoff on July 2, 2017.

The research team has found that the failure was caused by a problem in the engine of the first core stage of the rocket. "We have made improvements to the design, materials and technologies of the engine," said Li Dong, chief designer of the Long March-5 rocket from the China Academy of Launch Vehicle Technology (CALT) under the CASC.

Compared with the Long March-5 Y2, the new rocket has more than 200 technological improvements, said Yang Hujun, deputy chief designer of the rocket.

The modified engine has undergone more than 10 ground tests lasting over 3,000 seconds in total.

"Over the past two years, the research team has solved the problem of the engine and improved the reliability of the rocket," said Wang Jue, chief commander of the research team.

The carrying capacity of the Long March-5 rocket equals that of other mainstream large-scale rockets in the global industry, greatly improving China's ability to launch spacecraft and laying the foundation for developing new-generation carrier rockets and heavy-lift launch vehicles, said Wang Xiaojun, head of the CALT.

The rocket is about 57 meters long, equivalent to the height of a 20-story building, with a 5-meter diameter core stage and four 3.35-meter diameter boosters. The Long March-5 is much larger than China's previous carrier rockets. It has a takeoff weight of about 870 tonnes and a thrust of over 1,000 tonnes.

The four boosters, developed by the Shanghai Academy of Spaceflight Technology under the CASC, shoulder over 90 percent of the takeoff thrust.

The rocket uses environmentally friendly fuel, including kerosene, liquid hydrogen and liquid oxygen, rather than highly toxic propellants.

It is equipped with eight liquid oxygen/kerosene rocket engines in four strap-on boosters, two liquid hydrogen/liquid oxygen engines in the first stage and two relatively small liquid hydrogen/liquid oxygen engines in the second stage.

The weight of the rocket itself only accounts for about 10 percent of the liftoff weight, and the other 90 percent is the weight of the propellants.

The research team has made efforts to decrease the weight of the rocket in its design. For instance, the thickness of the rocket shell in some parts is only a few millimeters, according to Li Linsheng, a structural strength analysis designer of the rocket.

The temperature of liquid hydrogen is minus 253 degrees centigrade, and the temperature of liquid oxygen is minus 173 degrees centigrade. The maximum temperature of the fuel during combustion in the rocket engine is more than 3,300 degrees centigrade.

China built the Wenchang Space Launch Center, the country's fourth space launch center, for the Long March-5 and other new-generation carrier rockets. The center is located on the coast of the tropical island province of Hainan, which avoids possible damage caused by the falling rocket remnants.

In the center is the country's largest and most advanced launch pad that is 70 meters tall, equivalent to the height of a 24-story building, and covers an area of 600 square meters, the same size as half a basketball court.

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China will finish the construction of the BeiDou-3 Navigation Satellite System (BDS-3), with another two geostationary orbit satellites to be launched before June 2020, said BDS Spokesperson Ran Chengqi on Friday.

Friday marks the one-year anniversary of China's BDS-3 system providing global service.

Ran said at a press conference of the State Council Information Office that with the BDS as the core, a more ubiquitous, integrated and intelligent navigation and timing system with comprehensive national positioning is scheduled to be established by 2035.

China sent 10 BDS satellites into space in 2019. The deployment of the core BDS-3 constellation system has been completed with all of the BDS-3 system's medium earth orbit satellites being networked.

With the system's upgraded intelligent operation and maintenance capabilities, the BDS-3 has provided stable and accurate services, boasting a positioning accuracy of better than five meters.

The BDS system has multiple service capabilities, including satellite-based augmentation, short message communication, ground augmentation as well as international search and rescue. It will provide more diversified services with better performance and higher accuracy in 2020, Ran said.

A series of documents on the BDS system were also released to promote the understanding of the system and facilitate its use. The documents were published on the official website of the Beidou Navigation Satellite System.

The BDS system has seen thriving applications in many areas and has fostered an industrial ecosystem, Ran said.

The 22nm process navigation and positioning chip supporting BDS-3's new signal has a smaller volume, lower power consumption and higher accuracy, and has realized large-scale application.

The new generation of BDS system-related products including high-precision antennas, boards, and broadband radio frequency chips has been developed.

The BDS system has also seen increasing applications in emerging fields such as the industrial Internet and Internet of Things, as well as autonomous driving, parking and logistics.

With the arrival of the 5G commercial era, BDS is accelerating the integration with new technologies such as the next generation of mobile communication, blockchain and artificial intelligence, Ran said.

The BDS system is playing an important role in many industries including transportation, agriculture, forestry and energy. It supports China's dynamic monitoring system for more than 6.5 million vehicles. It will further facilitate railway transportation, inland river shipping, ocean navigation and the management of transportation infrastructure construction, Ran said.

Ran said China is continuously promoting the development of a legal system for satellite navigation.

China's applications for satellite navigation patents have increased rapidly, and the number has reached 70,000, ranking the first in the world.

More BDS-related national standards and special standards will be released to ensure a sound environment for its industrial application, Ran added. - Xinhua

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 Why China can build its own space station?

https://youtu.be/FMvYUYFRFk4

China Aerospace started from scratch, and by 2019, the country is ushering in a phase of superspace programs: the Chang’e-4 lunar probe was successfully launched, the BeiDou Navigation Satellite System began providing global services and the Long March rockets have been launched over 300 times. The emergence of each set of data proves that China, once trailing behind in the global space programs, has now earned its place in the global space-program competition, and is tapping into a new field. Check out this video and have a look at why China can build its own space station.

See China’s Tiangong-2 Space Station Re-Enter Earth’s Atmosphere

https://youtu.be/00_nQvspkL8

China’s Tiangong-2 Space Station re-entered Earth’s atmosphere and burned up over the Pacific Ocean on July 19, 2019. A camera aboard Tiangong-2 captured imagery

Lift-off soon for China’s space station mission

https://youtu.be/qoqA3fcFPQM

China has announced the imminent launch of a mission that will start the process of building a space station by 2022. Making the announcement on February 4, 2019, Chinese space programme officials said astronauts are currently being recruited and trained, with drills and joint tests scheduled for the latter half of 2019. The space station will consist of three modules – a core cabin and two lab modules – and will be able to accommodate three astronauts working simultaneously. China is a relative latecomer to such space programmes since it was not a partner in the International Space Station (ISS), the habitable artificial satellite which was launched into orbit in 1998 and supporting its first long-term residents by November 2000. China has been opening up to international cooperation, however, agreeing with the United Nations Office for Outer Space Affairs to develop opportunities for scientists from around the world to carry out research on board the Chinese space station after it is operational in 2022.

China's space station: What you need to know

https://youtu.be/LINmR4wF6Xg

BDS, the Beidou Navigation Satellite System from China

China launches 23rd BeiDou satellite into space - CCTV News - CCTV.com English  http://t.cn/R5SsGFc

China eyes Silk Road countries for its Beidou satellite system

18 satellites to launch for BDS by 2018

China on Thursday vowed national efforts to complete its Beidou satellite navigation system to serve global users by 2020, with priority going to countries involved in the new Silk Road initiative.

The current goal of developing China's BeiDou Navigation Satellite System (BDS) is to "provide basic services to countries along the land and maritime Silk Roads and in neighboring regions by 2018, and to complete the constellation deployment of 35 satellites by 2020 to provide services to global users," said a white paper released Thursday by the State Council Information Office.

A "globalized" BDS would have "positive and practical significance" in terms of connectivity around the globe, especially the interconnection between China and Southeast Asian countries under the Silk Road plan, known as the Belt and Road initiative, Huang Jun, a professor at the School of Aeronautic Science and Engineering at Beihang University, told the Global Times on Thursday.

In line with the Belt and Road initiative, China will jointly build satellite navigation augmentation systems with relevant nations and promote international applications of navigation technologies, the white paper states.

To fulfill the 2018 goal, the country plans to launch some 18 satellites for the BDS by 2018, Ran Chengqi, BDS spokesperson, told a press conference on Thursday.

"In priority Chinese cities such as Beijing and Urumqi in Northwest China's Xinjiang Uyghur Autonomous Region, as well as low latitude countries like Thailand, the BDS is capable of offering a positioning accuracy of better than five meters," said Ran, who is also director of China's Satellite Navigation System Management Office.

Since 2015, the country has sent up seven more satellites into space in support of the BDS, including five navigation satellites and two backup satellites, Ran added, citing Sunday's launch of the BDS' 23rd satellite - a backup satellite - as an example.

In 2020, the BDS might offer different positioning accuracy choices and could provide centimeter-level accuracy under certain requirements, said Lu Weijun, a BDS expert at Beijing University of Posts and Telecommunications.

Unique features

Despite being a late starter compared with the US-developed GPS, China's BDS has unique features, Huang said, citing the BDS short-message communication service as an example.

"The short-message communication service is mainly useful in places with insufficient ground and mobile communication capabilities, such as deserts, seas and disaster areas where communication facilities have been destroyed," Lu told the Global Times.

More than 40,000 fishing vessels along China's coastline have been equipped with the BDS application terminals, Ran said, adding that they also provided better communication for islands near the coastline.

The BDS short-message communication service is mainly handled by five Geostationary Orbit (GEO) satellites, Lu said. Located above China, the five GEO satellites mainly serve a coverage area of Chinese territories and the Asia-Pacific region" and "could be used to locally enhance the signal in wartime, when other satellites might have been closed."

An independently designed global navigation and positioning network would also contribute to national security, Huang said. Industrial chain

China is developing chips, modules and other basic products based on the BDS and other compatible systems, and fostering an independent BDS industrial chain, the white paper noted.

"By the end of April, the BDS technology has been applied to more than 24 million terminals and over 18 million mobile phones," Ran said.

It is expected that by the end of this year, up to 50 million mobile phones will have been installed with domestic chips that will be compatible with three satellite navigation systems, namely the BDS, GPS and Russia's GLONASS, Wang Hansheng, vice president of Olink Star, a Beijing-based company that makes navigation satellite system products, told the Global Times.

By Ding Xuezhen Source:Global Times

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