www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Innovation

Beidou upgrades for global reach

By Zhao Lei in Xichang, Sichuan | China Daily | Updated: 2017-11-07 08:13

China has begun to upgrade its Beidou Navigation Satellite System with global-coverage capabilities through the launch of new satellites.

Two third-generation Beidou satellites, the first of their type, were lofted atop a Long March 3B carrier rocket from Xichang Satellite Launch Center in Sichuan province on Sunday night and were placed in medium Earth orbit thousands of kilometers above the Earth. They will function for at least 12 years, according to the China Satellite Navigation Office.

Beidou is the world's fourth navigation satellite system, following GPS in the United States, GLONASS in Russia and Galileo in the European Union.

The new-generation satellites feature better accuracy, stability and signal clarity than previous Beidou models thanks to improvements in intersatellite links, laser communication devices and atomic clocks. They will also be more compatible with GPS, GLONASS and Galileo, the satellite office said in a news release.

Yang Changfeng, chief designer of the Beidou system, said development of third-generation Beidou satellites started in 2009. Scientists used five Beidou satellites launched in 2015 and 2016 to verify technologies for the third-generation models.

Xie Jun, chief engineer of the third-generation Beidou satellites at the China Academy of Space Technology, said each of the newest satellites is able to operate autonomously for at least 60 consecutive days if the ground control encounters malfunctions. This enables the network to reduce dependence on ground stations and to reduce operational costs.

By the end of 2018, China will have launched 18 third-generation Beidou satellites into space to cover all nations involved in the Belt and Road Initiative, including the two launched on Friday, the office said.

The Belt and Road Initiative, proposed by President Xi Jinping in 2013, refers to the Silk Road Economic Belt and the 21st Century Maritime Silk Road. It is estimated to benefit about 4.4 billion people in 65 nations, according to the government.

The Beidou system now covers nearly 30 countries involved in the initiative including Pakistan, Egypt and Indonesia, the office noted.

In 2019 and 2020, China will send six third-generation Beidou satellites into medium Earth orbits, as well as three to inclined geosynchronous satellite orbits and two to geostationary orbits. Both are synchronized with the rotation of the Earth, but geostationary satellites are parked over the equator, according to gisgeography.com.

According to plans from the China Satellite Navigation Office, the network will be made up of more than 30 satellites before the end of 2020 - several now in orbit will be decommissioned by then - to give Beidou global coverage.

Twenty-seven satellites have been launched for the Beidou network, the first in 2000 and the most recent, before Sunday's launch, in June of last year. The system began providing positioning, navigation, timing and message services to civilian users in China and parts of the Asia-Pacific region in December 2012.

Beidou has acquired a great number of users in China. Most of the shared bicycles in Chinese cities now employ Beidou-based positioning services; more than 4 million taxis, long-distance buses and cargo trucks nationwide have been equipped with Beidou devices; and about 40 percent of smartphones in the Chinese market are able to access the services, according to Ran Chengqi, director of the China Satellite Navigation Office.

Beidou upgrades for global reach

Editor's picks
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 久久精品视频7 | 亚洲码一区二区三区 | 性久久久久久 | 一级特黄爽大片刺激 | 国产高清美女一级a毛片久久 | 久久怡红院 | 国产一区二区在线免费观看 | 又黄又爽又刺激的视频 | 久草在线中文 | 一本久久综合 | 亚洲视频欧美视频 | 日本作爱 | 欧美亚洲国产精品久久久 | 国产在线精品福利91香蕉 | 99精品视频观看 | 欧美日韩免费做爰视频 | 精品久久影院 | 国产精品久久亚洲一区二区 | 69av美女| 亚洲国产精品综合久久网络 | 免费一级毛片在线播放视频 | 国内高清久久久久久久久 | 亚洲悠悠色综合中文字幕 | 欧美精选在线 | 性感美女视频免费网站午夜 | 久草福利社 | 美女很黄很黄免费的 | 兔子先生节目在线观看免费 | 成年男人午夜片免费观看 | 黄色国产在线观看 | 九九精品视频一区二区三区 | 毛片欧美 | 午夜精品视频在线观看美女 | 99免费视频观看 | 精品国产日韩亚洲一区在线 | 一级毛片美国aaj毛片 | 老色歌uuu26 老师张开腿让我爽了一夜视频 | 狠狠色狠狠色综合 | 日日摸天天摸狠狠摸视频 | 欧美一级色视频 | 成人的天堂 |