Aero 版 (精华区)
发信人: ShenZhouV (从头再来), 信区: Aero
标 题: 再来一篇,microsat
发信站: 哈工大紫丁香 (2004年04月11日21:47:14 星期天), 站内信件
China To Launch Micro Imaging Birds
eye in the sky
by Wei Long
Beijing - Nov. 20 2000
China is developing two new microsats that will likely be launched in the near
future, Xinhua News Agency reported on Nov. 3.
During the Shanghai Science and Technology Forum, space officials revealed
that various government and university institutions began research and
development of the two microsats.
The institutions involving in the two projects include the No. 5 research
institute of China Aerospace Science and Technology Corporation (CASC),
Chinese Academy of Sciences (CAS), Tsinghua University in here, and Harbin
Institute of Technology (HIT) in the northeastern Heilongjiang Province.
The Microsat Project Department of CAS in Shanghai steers the research effort
of the microsat Chuangxin-1 (CX-1, Chuangxin means "innovation") while HIT
leads the development of the other microsat Tansuo-1 (TS-1, Tansuo means
"exploration").
The space officials did not disclose a timeline of when the two microsats
might be launched.
As a key research program of the national "863 Plan", TS-1 is the first
domestically designed and developed microsat. The 150 kg remote sensing
satellite will be launched into a 600 km orbit to map the Earth and monitor
natural disasters. The satellite uses integrated design and manufacturing
technologies, and carries a linear array of three CCD survey cameras which
will transmit images with a resolution of 10 m and an image swath of 120 km
wide.
The two new microsats will likely be launched on China's next generation of
smaller rockets. Both solid and liquid propellant rockets are currently under
development.
The recently formed company Space Solid Fuel Rocket Carrier Co. Ltd. (SSRC),
which is composed of five government departments and State-run corporations,
is in charge of research, development, production and marketing of the solid
propellant rocket, called Kaituozhe-1 (KTZ-1, Kaituozhe means "trailblazer").
Development of KTZ-1, with a payload capacity of 100 kg for polar orbits, is
expected to complete by 2001 and ready for launch in 2002.
Separately the Chinese Academy of Launch Vehicle Technology (CALT) and the
Shanghai Academy of Spaceflight Technology (SAST, formerly the Shanghai Space
Bureau) are developing a small liquid propellant rocket.
China's experience in mini- and microsatellites began less than two years
ago. In May 1999 China launched the 297 kg minisat Shijian-5 (SJ-5, Shijian
means "practice"), which carried experiments on microgravity fluid and space
physics.
In June this year the 50 kg microsat Tsinghua-1, China's first
~~~~~~~~~~~~~~为啥这么介绍呢?
microsatellite, was launched aboard a Russian rocket. A joint project between
the Tsinghua University and the University of Surrey in U.K., Tsinghua-1 has
returned many Earth observations images since achieving orbit.
Both the Tsinghua University and the Harbin Institute of Technology are
particularly active in the expanding field of microsatellites. Since 1997 HIT
began research work on microsats. In late June this year Tsinghua University
and several high-tech companies formed the Aerospace Tsinghua Satellite
Technology Co. Ltd. (ATST), with a focus on developing microsats and detector
technologies, and marketing their applications.
Xinhua reported that China would use microsats in data transmission,
environment monitoring, space environment observations, positioning and
navigation, and science experimentation.
According to the space officials, the attractiveness of microsats is their
low investment and operational costs, flexibility in making changes, and
short system development cycles.
These advantages are drawing the attention of the Chinese military branch. An
analysis published on July 12 in the People's Liberation Army Daily suggested
that China could deploy a network of microsats for global reconnaissance.
The analysis wrote: " ... Each microsat has a large computational capability.
Tens, or even hundreds, of these microsats can be networked to form a
'skynet', which would provide a carpeted global coverage and thus realizing
high-altitude military reconnaissance with no 'dead zones'.
"A trend is developing with more recon satellites that are placed in low- and
medium-orbits instead of high-orbits and unmanned aerial recon flights that
are shifted to low-orbit space operation. Integrating all the benefits [of
these two types of recon mode] would give space superpowers a new mutlilayers
space reconnaissance system.
"The advantages of such a system include rendering an enemy's space defense
mode deficient, and providing a global coverage of information transmission
which allows total area monitoring and more timely data management and
dissemination of imagery."
The analysis further said that conceivably hundreds or thousands of these
microsats, and the smaller nanosats, would be launched by microlaunchers into
orbits.
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※ 来源:·哈工大紫丁香 bbs.hit.edu.cn·[FROM: 172.16.7.45]
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