男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

Satellite navigation system launched

Updated: 2011-12-28 07:30

By Xin Dingding (China Daily)

  Comments() Print Mail Large Medium  Small 分享按鈕 0

Country joins elite club as Beidou goes into operation on trial basis

BEIJING - China started to run its own satellite positioning system, Beidou, on Tuesday as the country climbed the global tech ladder and challenged the monopoly of the West.

Beidou, or Big Dipper, the domestic version of the US Global Positioning System (GPS), started providing navigation, positioning and timing data on a pilot basis to China and the neighboring area for free on Tuesday, Ran Chengqi, director of the China Satellite Navigation Office, said.

The system, with 10 orbiting satellites, covers an area from Australia in the south to Russia in the north. Signals can reach the Xinjiang Uygur autonomous region in the west and the Pacific Ocean in the east, Ran said.

With six more satellites to be launched next year, the system will cover a wider area and eventually the entire globe by 2020 with a constellation of 35 satellites, he said.

The accuracy of the positioning service will also improve as more satellites orbit.

During the trial run Beidou can offer positioning to within 25 meters but when the system is officially launched next year accuracy will be enhanced to within 10 meters, he said.

With the system operational China is the third member of an elite group, along with the US and Russia, to develop a satellite navigation system.

The US spent 20 years and more than $20 billion on the GPS. Completed in 1994, the system has 24 navigation satellites and is widely used around the world.

Beidou has its own unique features, Ran said.

"It not only tells users where they are and what time it is but also allows users to tell others the information through short messages," Ran said, adding that this feature is being considered by other systems.

Russia's Glonass system achieved a 24-satellite constellation in 1996 but succumbed to funding problems.

The rebuilding of the Glonass system is almost finished and Russian media reported that the system resumed service earlier this month.

The European Union and the European Space Agency are building the Galileo satellite navigation system. Japan and India also intend to build independent regional navigation systems.

   Previous Page 1 2 Next Page  

主站蜘蛛池模板: 白水县| 常州市| 化州市| 桓台县| 县级市| 离岛区| 顺昌县| 三门峡市| 长顺县| 岳池县| 新闻| 永福县| 高雄市| 南澳县| 乐都县| 东光县| 信宜市| 武川县| 石屏县| 永修县| 中阳县| 汾阳市| 区。| 庆安县| 美姑县| 维西| 龙口市| 房产| 沛县| 驻马店市| 华坪县| 北辰区| 农安县| 东光县| 吴旗县| 霍林郭勒市| 阿克陶县| 安阳市| 东台市| 东阿县| 临西县|