久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

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

China upgrades satellite navigation system

By Zhao Lei in Xichang, Sichuan province | chinadaily.com.cn | Updated: 2017-11-06 04:23

China upgrades satellite navigation system

Two third-generation Beidou satellites were lifted atop a Long March 3B carrier rocket at 7:45 pm from the Xichang Satellite Launch Center in Sichuan province on Sunday night. [Photo/Chinanews.com]

China launched the first satellites in the third generation of its Beidou Navigation Satellite System on Sunday night in the first step of establishing a vast positioning and navigation network with global coverage.

Two third-generation Beidou satellites, the first of their type, were lifted atop a Long March 3B carrier rocket at 7:45 pm from the Xichang Satellite Launch Center in Sichuan province on Sunday night and have been placed in medium Earth orbits thousands of kilometers above the Earth.

They will be at work for at least 12 years in space, according to the China Satellite Navigation Office.

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

Compared with previous Beidou satellites, the new-generation features better accuracy, stability and signal clarity thanks to improvements in the inter-satellite link, laser communication devices and atomic clocks. They will also have better compatibility with GPS, GLONASS and Galileo, the office said in a news release on Sunday.

Yang Changfeng, chief designer of the Beidou system, said development of the third-generation Beidou satellites started in 2009 and scientists used five Beidou satellites that were launched in 2015 and 2016 to verify technologies to be used in 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 new satellites is able to operate autonomously for at least 60 consecutive days if the ground control encounters malfunctions, which is an advantage enabling the network to reduce dependence on ground stations and reduce operational costs.

So far, 27 satellites have been launched for the Beidou network, the first in 2000 and the most recent, prior to Sunday's launch, in June 2016. 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.

Previous 1 2 3 Next

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
 
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    高清不卡一区二区在线| 91麻豆视频网站| 日本一区二区三区国色天香| 国产成人精品一区二区三区四区| 国产精品天干天干在线综合| 337p日本欧洲亚洲大胆色噜噜| 国产成人综合自拍| 亚洲图片另类小说| 欧美日韩一区二区三区免费看| 美女视频一区在线观看| 久久久久久电影| 91美女视频网站| 调教+趴+乳夹+国产+精品| 精品电影一区二区| 夫妻av一区二区| 亚洲一区日韩精品中文字幕| 日韩视频在线观看一区二区| 国产99精品在线观看| 一区二区三区在线免费播放| 欧美一区二区三区公司| 成人国产精品免费网站| 亚洲高清不卡在线| 久久久精品综合| 在线亚洲人成电影网站色www| 日韩av高清在线观看| 中文字幕精品在线不卡| 在线日韩国产精品| 狠狠色丁香久久婷婷综合丁香| 自拍偷拍亚洲欧美日韩| 91麻豆精品91久久久久久清纯| 国产91在线看| 亚洲v中文字幕| 中文字幕巨乱亚洲| 制服丝袜中文字幕亚洲| 丰满白嫩尤物一区二区| 日韩精品91亚洲二区在线观看| 国产日韩成人精品| 欧美日本一区二区三区| 国产激情一区二区三区| 亚洲成av人片在线观看| 中文无字幕一区二区三区| 欧美日韩精品一区二区天天拍小说| 国产精品一区在线观看你懂的| 亚洲一区二区三区小说| 国产亚洲欧美色| 欧美丰满嫩嫩电影| 91性感美女视频| 国产一区二区毛片| 亚洲v中文字幕| 亚洲少妇最新在线视频| xnxx国产精品| 6080yy午夜一二三区久久| 99久久er热在这里只有精品15| 久久99精品久久久久久动态图 | 欧美一级黄色大片| eeuss鲁片一区二区三区| 久久99精品国产91久久来源| 亚洲一二三四区| 中文字幕av不卡| 欧美电影免费观看高清完整版在| 一本久道中文字幕精品亚洲嫩| 国产精品888| 蜜桃视频在线一区| 图片区小说区国产精品视频| 亚洲天堂精品视频| 国产欧美日韩综合| 精品国产乱码久久久久久老虎| 欧美日韩国产在线观看| 91麻豆国产香蕉久久精品| 成人听书哪个软件好| 久久精品99久久久| 日本大胆欧美人术艺术动态| 亚洲妇女屁股眼交7| 亚洲精品自拍动漫在线| 国产精品久久久久一区| 久久久久久夜精品精品免费| 日韩欧美国产精品一区| 欧美丰满嫩嫩电影| 欧美人体做爰大胆视频| 欧美在线观看视频在线| 一本一道久久a久久精品综合蜜臀 一本一道综合狠狠老 | 亚洲男同1069视频| 国产精品成人免费在线| 日本一区二区免费在线观看视频| 精品乱人伦小说| 日韩欧美电影一区| 日韩一级片网站| 51久久夜色精品国产麻豆| 欧美日韩精品高清| 欧美日韩国产美女| 欧美日韩久久久| 欧美美女网站色| 91麻豆精品国产91久久久使用方法| 欧美日韩一区中文字幕| 欧美日韩aaaaaa| 欧美久久一区二区| 91.麻豆视频| 51精品国自产在线| 日韩欧美国产综合在线一区二区三区| 欧美年轻男男videosbes| 欧美日韩夫妻久久| 欧美精品久久天天躁| 欧美一区二区免费观在线| 欧美一级一级性生活免费录像| 欧美精品粉嫩高潮一区二区| 91麻豆精品久久久久蜜臀| 欧美精品乱码久久久久久按摩| 欧美一区二区三区在线视频| 91精品国产综合久久婷婷香蕉| 91麻豆精品国产综合久久久久久 | 国产午夜精品一区二区三区四区| 国产亚洲自拍一区| 中文字幕一区二区三区不卡在线| 日韩伦理av电影| 亚洲第一主播视频| 秋霞午夜av一区二区三区| 秋霞电影网一区二区| 激情综合色综合久久| 国产精品自拍在线| 99九九99九九九视频精品| 色综合久久久久综合99| 欧美日韩在线一区二区| 日韩一区二区三区观看| 久久久久久麻豆| 综合欧美亚洲日本| 午夜视频久久久久久| 久久超碰97中文字幕| 成人国产在线观看| 欧美亚洲愉拍一区二区| 欧美一区二区三区影视| 久久精品一区二区三区四区| 国产精品久久久久永久免费观看| 一区二区三区四区在线播放| 免费在线观看视频一区| 国产成人精品综合在线观看| 色综合一区二区三区| 91超碰这里只有精品国产| 精品国产91亚洲一区二区三区婷婷| 国产偷国产偷精品高清尤物| 亚洲色图色小说| 蜜桃视频第一区免费观看| 国产精一区二区三区| 91九色02白丝porn| 欧美成人a视频| 一区视频在线播放| 亚洲韩国精品一区| 极品美女销魂一区二区三区| 成人激情校园春色| 欧美日韩一区在线| 国产亚洲一区二区在线观看| 亚洲黄色免费网站| 另类综合日韩欧美亚洲| 成人精品视频一区二区三区| 欧美视频中文字幕| 国产亚洲一区二区三区四区| 夜夜嗨av一区二区三区网页 | 国产日韩亚洲欧美综合| 一片黄亚洲嫩模| 狠狠色狠狠色综合日日91app| 91一区二区三区在线观看| 欧美一级日韩免费不卡| 国产精品久久三区| 青青草97国产精品免费观看| 成人免费高清视频在线观看| 91精品国产色综合久久久蜜香臀| 国产精品久久久久久久浪潮网站| 日日夜夜一区二区| 99精品国产视频| 精品国产乱码久久久久久免费| 亚洲靠逼com| 国产乱码字幕精品高清av| 欧美日韩一本到| 国产精品久久久久一区二区三区 | 男女视频一区二区| 91麻豆精品在线观看| 久久丝袜美腿综合| 亚洲综合激情小说| 成人激情免费视频| 精品美女被调教视频大全网站| 亚洲女同一区二区| 国产一区二区三区综合| 666欧美在线视频| 亚洲精选在线视频| 国产99久久久久| 日韩欧美一级二级| 亚洲永久精品国产| 成人h动漫精品一区二| 精品福利av导航| 亚洲18色成人| 91麻豆精东视频| 国产欧美一区二区精品久导航| 日韩av一区二区在线影视| 91国内精品野花午夜精品| 中文字幕欧美激情一区| 精一区二区三区| 欧美美女喷水视频| 亚洲夂夂婷婷色拍ww47 | 欧美偷拍一区二区| 一区精品在线播放| 国产福利一区二区三区在线视频|