日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Innovation

China develops communications satellite tech edge

By Zhao Lei | China Daily | Updated: 2018-01-24 08:25
Share
Share - WeChat

China has become a leader in the cutting-edge technology of space-based, high-speed information transmission thanks to an advanced satellite, according to the National Space Administration.

The Shijian 13 communication satellite has conducted the world's first experiment on high-orbit laser communication, a technology crucial to enabling a spacecraft to send, receive and transmit a large quantity of data with ground stations, the administration said in a statement on Tuesday.

The experiment was one of the 11 technological demonstration programs made by Shijian 13, which is orbiting nearly 40,000 kilometers above the Earth, since it was lifted atop a Long March 3B carrier rocket from Xichang Satellite Launch Center in Sichuan province in April. It proved that the satellite is capable of carrying out steady, high-speed and high-quality transmission of information with the ground.

The fastest transmission speed recorded during the experiment was five gigabytes of data per second, which means a user could download a high-resolution movie within one second.

The administration said that the laser equipment was designed by Ma Jing and Tan Liying, two professors from Harbin Institute of Technology, and that the devices are the world's best of their kind in this field.

Shijian 13, developed by the China Academy of Space Technology and based on its DFH-3B communications satellite platform, has been called the country's most advanced communications satellite by the administration.

Weighing 4.6 metric tons, the satellite is expected to operate in a geostationary orbit for 15 years. It features a Ka-band broadband communications system capable of transmitting 20 gigabytes of data per second, exceeding the total capacity of all the country's previous communications satellites.

Shijian 13 uses an electric propulsion system, which allows it to carry more scientific instruments than previous satellites. At present, most satellites rely on chemical propulsion, which requires a relatively large amount of fuel that occupies space which could otherwise be used for scientific payloads.

Shijian 13 has been used to give 15 schools in southwestern China access to the internet, the administration said, explaining that students at those schools could not reach the internet because their schools are out of the reach of ground-based communications networks.

Wang Min, deputy head of the Institute of Telecommunication Satellite under the China Academy of Space Technology, previously said China plans to establish a constellation of advanced communications satellites based on the more advanced DFH 4 and DFH 5 platforms by 2025 and, after the plan is fulfilled, people will be able to use high-quality Wi-Fi services anywhere and anytime, including on bullet trains and planes.

Top
BACK TO THE TOP
English
Copyright 1994 - . 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: 久操综合 | 免费黄色在线网址 | 夜色99| 亚洲综合视频在线 | 香蕉视频导航 | 麻豆日韩 | 中文字幕视频网站 | 欧美日韩精品在线观看视频 | 欧美成人精品欧美一级私黄 | 久久国产福利 | 中文字幕一区2区3区 | 欧美成人h | 国产精品久久久久久久久免费 | 久久亚洲天堂 | 成人久久精品 | 国产精品九九九九九九 | 亚洲少妇一区二区 | 中文在线字幕免费观 | 中文字幕在线观看一区二区 | 美女福利在线观看 | 色爽女| av一二三四| 亚洲欧美视频 | 超碰一区二区 | 成年人三级网站 | 伊人成综合网 | 亚洲一区二区视频在线 | 欧美激情午夜 | 国产精品视频网 | 国产资源站 | 九九精品国产 | 91精选国产 | 天天爽夜夜 | 日韩一区二区三区精品 | 麻豆91在线观看 | 性做爰过程免费看 | www.亚洲.com| 青青青国产 | 天天爽夜夜爽人人爽 | 婷婷社区五月天 | 四虎在线免费观看视频 |