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 / Hotspot

Designers: Beidou progressing at rapid pace

By Hao Nan | China Daily | Updated: 2013-05-15 05:32
The first ground-based augmentation system to improve the performance of the Beidou Satellite Navigation System developed by China was approved and accepted in March in Wuhan, Hubei province.

The general index of the system's precision reached "an international advanced level", according to an evaluation committee led by Sun Jiadong, an academician with the Chinese Academy of Sciences and chief designer of the Beidou system.

Consisting of 30 ground tracking stations, an operating system and a precision positioning system, the augmentation system will significantly improve the accuracy and reliability as well as reducing the positioning time of Beidou, said Liu Jingnan, an academician of the Chinese Academy of Sciences from Wuhan University.

Established as a national pilot project, the augmentation system was planned by the central government and jointly developed by the prestigious Wuhan University and the Hubei Bureau of Surveying and Mapping using their own proprietary technologies.

In the Asia-Pacific region covered by the Beidou system, the satellites can locate a user with an accuracy of 10 meters.

Key technology

However, the positioning precision can be further improved to 2 cm in the horizontal and 5 cm in the vertical in Hubei, thanks to the three-step real-time positioning technology, industry specialists said.

This technology will be used in special industries, such as mapping, land resources and urban planning, water conservation and national construction projects.

For public uses, such as vehicle tracking and ship positioning, the system also has a single-frequency differential navigation technology that locates targets with an accuracy of 2 meters.

The Hubei Meteorological Administration also uses the services of the augmentation system to realize real-time transmission, monitoring and processing of ground-based meteorological observation data for more accurate weather forecasting.

Designers: Beidou progressing at rapid pace

A rocket carrying a navigation satellite is ready to be launched at an astronautic center somewhere in China.

Early in the 1980s, China began to explore the development of the satellite navigation system in line with the nation's actual conditions.

A satellite navigation system can satisfy diverse demands of society, experts said, which reflects not only a country's scientific capacities but also its comprehensive strength. In doing so, the Beidou system will play an irreplaceable role in both strategy and tactics.

The Beidou navigation project was officially carried out in 2004, aimed to provide high-quality positioning, navigating and timing services to users across the world.

The system consists of three sectors - satellites, ground tracking stations and user terminals.

It will have a total of 35 satellites when the system is fully operational, including five in geostationary orbit.

16 satellites to date

So far, the fledgling Beidou satellite navigation and positioning system has 16 satellites hovering over the Asia-Pacific region, and 14 more satellites will be added, enabling the Beidou network to achieve a global coverage.

When it is complete, China will become the third country worldwide with an independent satellite navigation system, following the footsteps of the United States and Russia.

"China will introduce a world-leading navigation system to more than 100 cities and 200 million users across the country by 2020," Cao Jianlin, vice-minister of Science and Technology, said.

At some point, Beidou could rival the US Global Positioning System (GPS) and Russia's Global Navigation Satellite System for service around the globe, he noted.

The system can communicate with the ground stations by sending and receiving short messages in addition to the navigation and timing functions that other navigation systems can provide, he explained.

Cao added that the Beidou system will be open to foreign companies and allows interoperability with other systems.

Li Changjiang, chief commander of the Beidou system, said its success is due in part to the technology behind the atomic clock, which is the most complex one in the system.

Atomic timepieces are vital tools in the Beidou system because their accuracy and stability are key requisites, Li noted.

In addition, he said that another important application of the system is to provide precision for any transactions that requires speed and accuracy, such as bank settlements.

By the end of 2012, Beidou had provided services to more than 130,000 military and civilian users in the fields of transportation, meteorology, financial services, power generation, fishery and firefighting, according to the China Satellite Navigation Office, which is in charge of the operation of the system.

More and more Chinese cities are also applying Beidou services in their high-tech sectors.

A spokesman of the office said the Beidou system has been stable since it started trial operations at the end of 2011.

It has been widely used in such fields as national security, major national events and hydrological monitoring, and also served as an important means of communication during relief work after the Wenchuan and Yushu earthquakes, he added.

Wu Jianglong contributed to the story

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: 国产真实搭讪系列 | 114毛片免费观看网站 | 在线播放免费一级毛片欧美 | 亚洲qingse中文久久网 | 国外成人在线视频 | 精品一区二区三区在线观看l | 久久中文字幕乱码免费 | 国产精品毛片一区 | 亚洲精品第一第二区 | 国产精品视频一区二区三区 | 国产成人午夜极速观看 | 久久亚洲国产欧洲精品一 | 免费被黄网站在观看 | 一级白嫩美女毛片免费 | 韩日精品 | 成人软件18免费 | 一级做a爰在线就看 | 最新主播福利视频在线观看 | 国产一区二区在线播放 | 国产高清在线观看视频手机版 | 在线观看欧美亚洲日本专区 | 国产精品麻豆一区二区三区v视界 | 欧美aaaaa激情毛片 | 欧美激情一级欧美精品 | 亚洲爱爱天堂 | 99精品国产高清一区二区三区香蕉 | 欧美高清色视频在线播放 | 国产成人免费手机在线观看视频 | 99精品久久久久久久 | 波野多衣在线观 | 性欧美精品孕妇 | 成年免费在线观看 | aa级毛片毛片免费观看久 | 日本国产最新一区二区三区 | 一本色道久久综合网 | 永久精品免费影院在线观看网站 | 日韩美女一级毛片a | 日韩欧美中文字幕在线观看 | 欧美日韩在线观看一区二区 | 免费a级毛片大学生免费观看 | 亚洲视频三区 |