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Thread: China's GPS - Beidou

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    China's GPS - Beidou

    China is building it's own GPS and it aims to have it ready by 2020.

    http://gbtimes.com/china/long-march-...idou-satellite

    China’s BDS is similar to US GPS, Russia’s GLONASS, and the European Galileo positioning, navigation and timing satellite constellations.

    Receivers for GNSS signals are widely used in cars, aviation, shipping, and mobile phones for navigation and tracking.

    Like other providers, China’s BDS provides open signals for civilians and encrypted signals reserved for state and military use.

    By establishing its own constellation of GNSS satellites, the Chinese government aims to cut previous reliance on American GPS services that would not be available in the event of conflict.

    The Beidou system is officially planned to provide global coverage by 2020 with a full constellation of 35 satellites, but following excellent progress it could be completed as early as 2017, according to nasaspaceflight.com.

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    The Chinese government on 16 June released a white paper elaborating on the development of BeiDou Navigation Satellite System (BDS), which has been independently developed and operated by China. According to the document, China has formulated a three-step strategy for developing the BDS, aiming to complete the constellation deployment with 35 satellites around 2020 to provide services to global users, according to the document, which was unveiled by the State Council Information Office.

    http://news.xinhuanet.com/english/ch..._135441516.htm

    The BeiDou Navigation Satellite System (hereinafter referred to as the BDS) has been independently constructed and operated by China with an eye to the needs of the country's national security and economic and social development. As a space infrastructure of national significance, the BDS provides all-time, all-weather and high-accuracy positioning, navigation and timing services to global users.

    In the late 20th century, China started to explore a path to develop a navigation satellite system suitable for its national conditions, and gradually formulated a three-step strategy of development: to complete the construction of the BDS-1 and provide services to the whole country by the end of 2000; to complete the construction of the BDS-2 and provide services to the Asia-Pacific region by the end of 2012; and to complete the construction of the BDS and provide services worldwide around 2020.

    Along with the development of the BDS project and service ability, related products have been widely applied in communication and transportation, marine fisheries, hydrological monitoring, weather forecasting, surveying, mapping and geographic information, forest fire prevention, time synchronization for communication systems, power dispatching, disaster mitigation and relief, emergency search and rescue, and other fields. These products are gradually penetrating every aspect of social production and people's life, injecting new vitality into the global economy and social development.

    Navigation satellite systems are public resources shared by the whole globe, and multi-system compatibility and interoperability has become a trend. China applies the principle that "The BDS is developed by China, and dedicated to the world" to serve the development of the Silk Road Economic Belt and the 21st Century Maritime Silk Road ("Belt and Road Initiative" for short), and actively pushes forward international cooperation related to the BDS. As the BDS joins hands with other navigation satellite systems, China will work with all other countries, regions and international organizations to promote global satellite navigation development and make the BDS better serve the world and benefit mankind.

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    Updates on China's BeiDou Navigation Satellite System (BDS) in 2016 and plans for 2017.

    http://gpsworld.com/directions-2017-...lobal-service/

    In 2017, three to four launches of BeiDou satellites will occur. BDS will provide basic services to the countries along the Belt and Road region by 2018, and possess global service capability by 2020.

    BDS will keep improving its nationwide reference station network and steadily enhance its service performance. The dense reference stations for the nationwide frame network will be constructed by 2018, providing meter and decimeter level real-time location services for users in China, even centimeter level service in some areas.

    BDS will carry out the design, validation and construction of SBAS in accordance with international civil aviation standards. The first GEO satellite of BDSBAS will be launched in around 2018. The satellite-based augmentation services covering China and surrounding regions will be provided from 2020, to provide CAT-I services to civil aviation users.

    China will promote construction of a national comprehensive positioning, navigation and timing (PNT) system based on BDS, and strive to establish such a national PNT system with a united benchmark, no-gap coverage, security and effectiveness by 2030, as well as to upgrade capabilities to provide time and space information.

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    China and Russia are making progress in the synchronization of GLONASS and BeiDou navigation systems.

    https://sputniknews.com/science/2016...lonass-beidou/

    Russia and China have achieved a significant progress in the synchronization of GLONASS and BeiDou navigation systems, Roscosmos head Igor Komarov said Monday.

    "We have achieved a considerable progress in the field of cooperation… on the harmonization and synchronization of GLONASS and BeiDou systems. All contracts have been signed, and the work is proceeding. There are prospects, there is great interest on the part of the partners in different fields: the engines, the joint development of launch vehicles, manned space programs, conducting of experiments at the low-Earth orbit," Komarov told Kommersant newspaper in an interview.

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    So with all of these parallel systems, will they start selling commercial devices that can use all of them?

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    Quote Originally Posted by KaiYeves View Post
    So with all of these parallel systems, will they start selling commercial devices that can use all of them?
    My understanding was yes, as adding extra satellites to pin point your location gives better accuracy.

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    Quote Originally Posted by KaiYeves View Post
    So with all of these parallel systems, will they start selling commercial devices that can use all of them?
    There already are commercial devices that can use multiple satellite navigation systems, the common navigation modules used in mobile phones uses GPS and GLONASS satellites simultaneously. Not sure if any incorporate the others yet but if not its only a matter of time given the advantages of having more satellites available, particularly for mobile phones as they are often used with a poor view of the sky

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    Ah, thank you!

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    Quote Originally Posted by selvaarchi View Post
    My understanding was yes, as adding extra satellites to pin point your location gives better accuracy.
    When the Russian and Chinese systems are integrated, they hope to have an accuracy of around 1 meter (3.3 feet)

    https://sputniknews.com/world/201701...te-navigation/

    Russia and China are in the process of setting up a joint Differential Corrections and Monitoring (SDCM) high-precision satellite navigation system, China National Space Administration (CNSA) chief representative in Russia Zhang Yuan said Tuesday.

    "We are not in the process of implementing [the system]," Zhang told RIA Novosti in response to a question on the time frame for building the system's first six ground stations.

    Plans for the system were first mentioned in 2015. In September, the Russian Space Systems (RSS) company said talks were ongoing. RSS deputy head engineer Grigory Stupak said that high precision would be achieved by expanding the two countries' network of SDCM system stations working with the Russian Glonass and Chinese BeiDou satellite navigation systems.

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    Quote Originally Posted by selvaarchi View Post
    When the Russian and Chinese systems are integrated, they hope to have an accuracy of around 1 meter (3.3 feet)
    Sounds like the Chinese hope to achieve a better accuracy on their own.

    http://www.scmp.com/news/china/socie...in-millimetres
    Yang Yuanxi, deputy chief designer of the Beidou system, told state media earlier this year that the latest satellites would be at least 10 times more precise than existing models.

    These were accurate to centimetres, similar to the US-developed GPS, he said.

    The satellite navigation system calculates a user’s location by measuring tiny differences in the arrival time of electromagnetic pulses from several positioning probes in the sky, but a new atomic clock on Beidou-3 could reduce the margin of error to a few millimetres.

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    Chinese Beidou being integrated with the other major GPS systems.

    http://english.cctv.com/2017/11/24/A...gl171124.shtml

    China's domestically developed navigation satellite system Beidou has been included in a global network that collects and distributes data for search and rescue missions, the Ministry of Transport said on Thursday.

    Beidou will be part of the International Cospas-Sarsat Programme, a nonprofit, intergovernmental and humanitarian cooperative with 44 members, including the United States, Canada, Russia and China.

    The inclusion comes after a ministry delegation submitted the Chinese system's technology and launch plan for search and rescue to the program during the 31st Cospas-Sarsat Council meeting in late October in Montreal, Canada.

    "The move will enhance Beidou's global capability to search for and rescue people in distress, showing China has carried out its responsibilities in global humanitarianism in accordance with international conventions," Wu Chungeng, a ministry spokesman, said at a news conference on Thursday.

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    All the critical components for BeiDou are made in China.

    http://www.xinhuanet.com/english/201..._136867598.htm

    All the key components of China's BeiDou navigation satellites are made in China, ending reliance on imports, Xie Jun, chief designer of the Beidou system, said on Tuesday.

    Key components such as traveling-wave tube amplifiers, microwave switches, and high-power current source controllers are now all made in China instead of being imported, Xie said.

    Xie also said his team has mastered all the core technologies for the global BeiDou network of satellites, aiming to make it as good as the Global Positioning System (GPS).

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    Two more satellites have been added to the Beidou system moving it a bit closer to have world wide coverage.

    https://gbtimes.com/china-sends-new-...launch-of-2018

    The pair launched today are the 28th and 29th satellites for China's Beidou navigation system, China's answer to the US Global Positioning System (GPS), Russia's GLONASS and Europe's Galileo GNSS constellations.

    The satellites are part of a third phase of Beidou deployment, which will take Beidou coverage from regional to covering the countries along the 'Belt and Road' initiative by the end of 2018, and global by 2020.

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    Quote Originally Posted by selvaarchi View Post
    When the Russian and Chinese systems are integrated, they hope to have an accuracy of around 1 meter (3.3 feet)
    Sounds like the Chinese hope to achieve a better accuracy on their own.

    http://www.scmp.com/news/china/socie...in-millimetres
    I know this is in response to an old post, but it's a short thread, so far.

    I think the difference is that the meter accuracy is non-encrypted (civilian use), whereas the millimeter accuracy is encrypted (military use).

    From that article:
    The improved accuracy of Beidou-3 would hardly be noticeable to most civilian users, he said. Only the military or organisations authorised by the government, however, would be able to get access to the ultra-high accuracy service for special tasks, he said.

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    Quote Originally Posted by grapes View Post
    I know this is in response to an old post, but it's a short thread, so far.

    I think the difference is that the meter accuracy is non-encrypted (civilian use), whereas the millimeter accuracy is encrypted (military use).

    From that article:
    You are right. The 2nd page of the latest article on Beidou does state "However, paying customers will be provided with services that will be accurate to about a centimeter."

    https://www.ecns.cn/2018/02-14/292731.shtml

    When cyclists use one of the Mobike or ofo shared bikes that seem to dot almost every major city in China, they probably don't relate the colorful two-wheeler in front of them with a state-of-the-art spacecraft in orbit high above the Earth.

    But without the navigational and positioning services that satellites provide, the entire bike-sharing sector would be no more than a pipe dream.

    Similarly, without satellite-based navigation devices, tourists and motorists would find that making their way around a megacity or an unfamiliar place would be like solving a puzzle in the dark.

    "Like electricity, satellite-based navigation and positioning services have become an indispensable part of people's lives," said Chi Jun, a senior project manager for the China Academy of Space Technology at China Aerospace Science and Technology Corp.

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    BeiDou normal users can now get accuracy within one to two meters.

    http://en.chinabeidou.gov.cn/c/341.html

    China's domestically-produced satellite navigation system BeiDou is said to have made significant progress on its accuracy. At a press conference on Tuesday, BeiDou engineers claimed that a new accurate positioning chip can now help users arrive at their destinations with an error margin of just one to two meters.

    Positioning accuracy up from 10 meters to within one to two meters. And distinguishing the difference between the main highway and a side road. All this is now possible with the release of a new accurate positioning chip from China's very own satellite navigation system BeiDou.

    And that's not all.

    "For users, there are two big improvements. One is the time the system takes to process your journey. This is down from 30 seconds to just 3 seconds. It can know exactly where your car is even before you start the engine. The second improvement is the position accuracy. The system can now tell if the car is on the main road or side road, which will help to improve safety on the roads," Beidou engineer Li Xueli said.

    BeiDou estimates that its satellite navigation system will be installed in over 10 million Chinese cars this year.

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    China opens first overseas center for BeiDou navigation satellite system in Tunisia.

    http://www.xinhuanet.com/english/201..._137103570.htm

    The China-Arab States BDS/GNSS Center, the first overseas center for China's indigenous BeiDou Navigation Satellite System (BDS), was officially inaugurated in Tunisia on Tuesday.

    The center is established as a pilot project between China and the Tunisia-based Arab Information and Communication Technology Organization (AICTO), an Arab governmental organization under the Arab League, to promote the global application of the BDS, said Ran Chengqi, director of China Satellite Navigation Office.

    "The center could serve as both a window to showcase the BDS, and a platform for promoting international exchanges and cooperation," Ran said.

    Mohamed Ben Amor, secretary general of AICTO, hailed the center as a unique technology project for the Arab region and the entire world.

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    China plans to launch another 11 BeiDou satellites this year.

    http://www.xinhuanet.com/english/201..._137200761.htm

    China will launch another 11 BeiDou-3 satellites by the end of 2018, adding to its domestic BeiDou Navigation Satellite System (BDS), said an official at an academic conference on Wednesday.

    China has already launched eight BeiDou-3 satellites. The satellites will provide initial services for countries and regions along the Belt and Road by the end of the year, said Wang Li, chairman of China Satellite Navigation System Committee.

    Addressing the Ninth China Satellite Navigation Conference in Harbin, capital of northeast China's Heilongjiang Province, Wang said the BeiDou system is moving to become a global service provider after offering stable and reliable time and space information for clients in the Asia-Pacific region.

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    Two more Beidou satellites to be launched this wednesday 19/9/2018.

    https://gbtimes.com/china-to-launch-...r-on-wednesday

    China will launch the next pair of satellites for its Beidou navigation and positioning system on Wednesday, according to airspace closure notices.

    A Notice to Airmen (NOTAM) filed last week indicates a window of 1358-1432 UTC (21:58-22:32 local, 9:58-10:32 Eastern) for a launch from the Xichang Satellite Launch Centre in Sichuan Province, southwest China.

    If the launch goes according to plan, the mission will see the 12th and 13th Beidou satellites put into orbit this year alone, with the country pushing to complete the system of 35 operational satellites in 2020.
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    "China will expand the application of its home-grown BeiDou navigation system to cover all transportation fields"

    http://www.xinhuanet.com/english/201..._137627002.htm

    Over the past few years, over 6.17 million domestic vehicles nationwide and 35,000 vehicles of postal services or courier companies have installed or become compatible with the BeiDou navigation system, according to MOT spokesperson Wu Chungeng.

    The navigation system has also been installed in 80,000 buses, 370 ships and the country's domestically-manufactured commercial airplanes.

    The country is also promoting the international use of the BeiDou system in sectors such as transportation and rescue, and ensuring it serves Belt and Road countries.
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    Bloomberg on China's BeiDou.

    https://www.bloomberg.com/news/artic...minance-of-gps

    China is taking its rivalry with the U.S. to the heavens, spending at least $9 billion to build a celestial navigation system and cut its dependence on the American-owned GPS amid heightening tensions between the two countries.

    Location data beamed from GPS satellites are used by smartphones, car navigation systems, the microchip in your dog’s neck and guided missiles -- and all those satellites are controlled by the U.S. Air Force. That makes the Chinese government uncomfortable, so it’s developing an alternative that a U.S. security analyst calls one of the largest space programs the country has undertaken.
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    BeiDou is now a global service. Congratulations China

    http://www.xinhuanet.com/english/201..._137702707.htm

    China's BeiDou Navigation Satellite System (BDS) has started to provide global service, said BDS Spokesperson Ran Chengqi on Thursday.

    At a press conference of the State Council Information Office, Ran said the construction of the BDS-3 primary system had been completed.

    "This signifies that BDS has officially entered the global era as the BDS expands from a regional system to a global navigation system," Ran said.

    "From now on, no matter where you go, BDS will always be with you," said Ran.

    The positioning accuracy of the system has reached 10 meters globally and five meters in the Asia-Pacific region. Its velocity accuracy is 0.2 meters per second, while its timing accuracy stands at 20 nanoseconds, according to Ran.

    By the end of 2018, there were a total of 33 BDS satellites operating in orbit, including 15 BDS-2 satellites and 18 BDS-3 satellites.
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    China expects to launch another 10 BeiDou satellites this year.

    http://www.xinhuanet.com/english/201..._137784548.htm

    China will send 10 satellites to join the BeiDou Navigation Satellite System (BDS) through seven separate launches this year, the China Aerospace Science and Technology Corporation (CASC) announced Tuesday.

    The launches will help complete the BDS global network by 2020, said Shang Zhi, director of the Space Department of the CASC, at a press conference, where the Blue Book of China Aerospace Science and Technology Activities was released.
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    "China achieves real-time transmission of deep-sea data"

    http://www.chinadaily.com.cn/a/20190...5c34e7ba6.html

    China has achieved real-time transmission of deep-sea data at 6,000-meter depth through Beidou satellites for the first time, according to the Institute of Oceanology under the Chinese Academy of Sciences.

    It is one of the breakthroughs Chinese scientists onboard research vessel Kexue, or "Science", made during its latest mission into the West Pacific. The scientists have also upgraded the country's scientific observation network in the West Pacific.
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    Quote Originally Posted by selvaarchi View Post
    "China achieves real-time transmission of deep-sea data"

    http://www.chinadaily.com.cn/a/20190...5c34e7ba6.html
    Maybe we should try that cameras-on-sperm-whales-to-film-giant-squid thing again.
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    Unfortunately, that article has no detail about what is meant by "real-time transmission of deep-sea data at 6,000-meter depth through Beidou satellites for the first time." Radio transmission through sea water at depth is extremely limited, generally restricted to extremely low frequency that doesn't require satellites, but has low data rates, and has other practical limitations. However, it is common for a submersible to send data via cable to a surface ship or beacon that interacts with a satellite. I would guess that's what's happening here (something that is a first for Beidou, but not a new technical achievement), but without more detail, there's no way to know what is meant.

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    Another interpretation occurred to me, and it's based on this issue: Do these satellites work like GPS, or do they have data relay capabilities as well? Another thought is perhaps they used the GPS-like capability and other instruments on a surface ship or submersible to make some determination about deep sea conditions.

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    Quote Originally Posted by Grashtel View Post
    There already are commercial devices that can use multiple satellite navigation systems, the common navigation modules used in mobile phones uses GPS and GLONASS satellites simultaneously. Not sure if any incorporate the others yet but if not its only a matter of time given the advantages of having more satellites available, particularly for mobile phones as they are often used with a poor view of the sky
    I purchased a Nokia 2.1 in December last year and, as well as GPS, the specs say it also supports:-

    https://www.gsmarena.com/nokia_2_1-9216.php
    Yes, with A-GPS, GLONASS, BDS

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    China's BeiDou Goddess.

    https://www.chinadailyhk.com/article...594389378.html

    Shoulder-length hair, black leather jacket, arms across her chest, a faint smile, Xu Ying graces the cover of a youth magazine.

    A rock star? No, Xu, 36, is a scientist.

    Xu leads a team at China's prime natural sciences research institute in developing the ground system and augmentation technology of China's BeiDou satellites.

    Named after the Chinese term for the Big Dipper constellation, BeiDou is one of the four space-based navigation networks operating globally, along with the US GPS system, Russia's GLONASS and the European Union's Galileo.
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    Yesterday was the 1st launch of a BeiDou satellite this year. China expects to launch another 8 to 10 BeiDou satellites this year.

    http://www.xinhuanet.com/english/201..._137993963.htm

    China sent a new satellite of the BeiDou Navigation Satellite System (BDS) into space from the Xichang Satellite Launch Center in Sichuan Province at 10:41 p.m. Saturday.

    Launched on a Long March-3B carrier rocket, it is the 44th satellite of the BDS satellite family and the first BDS-3 satellite in inclined geosynchronous Earth orbit.

    After in-orbit tests, the satellite will work with 18 other BDS-3 satellites in intermediate circular orbit and one in geosynchronous Earth orbit.

    Yang Changfeng, chief designer of the BeiDou system, said that the hybrid constellation design, in which three groups of satellites at different orbital regimes work in concert, was an exclusive BDS innovation and the world's first.
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