国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

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  

昂仁县| 凤凰县| 修文县| 祁连县| 类乌齐县| 临潭县| 九龙县| 大足县| 许昌市| 霍山县| 苏尼特左旗| 龙山县| 宁国市| 馆陶县| 周至县| 宜都市| 杭州市| 长白| 望城县| 富锦市| 贺兰县| 郯城县| 崇礼县| 博罗县| 乌拉特中旗| 垣曲县| 贵州省| 阿鲁科尔沁旗| 连山| 百色市| 肃宁县| 嘉鱼县| 麦盖提县| 珠海市| 西盟| 宁津县| 宁强县| 乌兰浩特市| 西昌市| 延庆县| 六安市|