三级aa视频在线观看-三级国产-三级国产精品一区二区-三级国产三级在线-三级国产在线

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Prime 已作廢 不再更新

Satellite launch completes network

By Xin Dingding | China Daily | Updated: 2012-07-27 08:04

A Tianlian I-03 satellite was launched from the Xichang Satellite Launch Center in Sichuan province on Wednesday night, completing the country's first data relay satellite network.

The network will be crucial to the manned space program, which aims to build a space station around 2020, experts said.

The satellite was launched on a Long March 3C rocket at 11:43 pm, according to the center.

Developed by the China Academy of Space Technology, under the China Aerospace Science and Technology Corp, the satellite will join two orbiting predecessors to boost the network.

The first data relay satellite, Tianlian I-01, was launched in April 2008, and the second was launched in July 2011.

The center said the third satellite is expected to improve network coverage of measurement and control services for China's manned spacecraft as well as the planned construction of future space labs and a space station.

Liu Jin, deputy chief designer of the Tianlian I satellite project, said that scientists from the manned space program used to rely on ground stations and ships to track and control spacecraft.

But these methods only allowed spacecraft to be tracked in just 15 percent of their orbit. For the other 85 percent, there was no communication between the spacecraft and the ground control, he said.

After the first two Tianlian I satellites were launched, coverage expanded to 70 percent.

In the latest manned space mission, the Shenzhou IX spacecraft and Tiangong-1 space lab module circled around the Earth every 90 minutes. Thanks to the two Tianlian I satellites, communication between Earth and orbiting craft can continue for more than 60 minutes in each circle, he said.

This, obviously, gave ground control more precise knowledge of the orbiting craft and the three astronauts, allowing it to provide better support, he said.

"It's crucial to China's manned space program," he said.

And after a space station is assembled in 2020, astronauts on long missions will be able to contact ground control at any time.

The network will also offer data relay services for medium and low-Earth orbits as well as measurement and control support for launches.

Wednesday's launch marked the 166th mission of China's Long March series of rockets.

Contact the writer at xindingding@chinadaily.com.cn.

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: 天天干成人网 | 国内视频一区二区 | 久久99精品久久久久久秒播 | 亚洲国产成人久久一区二区三区 | 国产男女野战视频在线看 | 国产精品久久久久久久小唯西川 | 69黄色片| 免费啪 | 国产第一页久久亚洲欧美国产 | 久久三级网站 | 91官网| 免费观看欧美性生 | 欧美一区二区三区免费 | 国产成人精品免费视频大全软件 | 尤物国产精品福利三区 | 欧美黄视频 | 国产日韩视频 | 欧美成人h版影片在线观看 欧美成人h版影院在线播放 | 老子影院午夜伦不卡亚洲 | 91精品免费久久久久久久久 | 毛片黄片免费看 | 久久99精品久久久久子伦小说 | 九九99九九视频在线观看 | 色婷婷社区 | 国产双插 | 一级a俄罗斯毛片免费 | 久九九久福利精品视频视频 | 嫩草成人国产精品 | 国内永久第一免费福利视频 | 92国产福利午夜757小视频 | 91精品国产手机在线版 | 成人性色生活影片 | 欧美高清在线不卡免费观看 | 国内精品久久久久久麻豆 | 国产污片在线观看 | 国产精品视频网站你懂得 | 一级毛片一 | 久久不卡精品 | a级在线观看 | 午夜大片免费完整在线看 | 一级日本强免费 |