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CCTV News央视新闻
29分钟前 来自 微博 weibo.com
#高分九号04星发射成功#【一箭双星!#清华科学卫星发射成功#】今天12时01分,我国在酒泉卫星发射中心用长征二号丁运载火箭,成功将高分九号04星送入预定轨道,发射获得圆满成功!此次任务还搭载发射了清华科学卫星,由清华大学负责研制,将在轨对重力卫星系统设计方法、基于双频GPS的精密轨道大气密度测量方法等理论与技术进行飞行验证。(总台央视记者杨弘杨)
Hainan eyes new satellite network
By Zhao Lei | China Daily | Updated: 2018-08-16 08:59
The heavy-lift carrier rocket Long March 5 blasts off Nov 3, 2016 at Wenchang Space Launch Center in South China's Hainan province.[Photo/Xinhua]
The southernmost island province of Hainan is preparing a satellite network that is expected to enable China to conduct effective and efficient surveillance over the South China Sea.
Design work for the Hainan Earth-Observation Satellite Constellation, a project headed by the Sanya Institute of Remote Sensing in Hainan and sponsored by the provincial government, has begun at the institute and by its contractors.
The first in the constellation, a Hainan 1 optical satellite, is scheduled to be launched in the second half of 2019, according to a statement from the institute.
The statement said the constellation will have 10 satellites that will be launched in four stages by the end of 2021. First, three Hainan 1 optical satellites are scheduled to enter orbit in 2019. The following year, three Hainan 1 satellites and two Sanya 1 multispectral remote-sensing satellites will be launched. In 2021, two Sansha 1 synthetic aperture radar satellites are expected to be sent into space.
At a meeting in Sanya on Tuesday, Chinese space experts reviewed and approved technical plans for the first four Hainan 1 satellites.
According to the institute, each Hainan 1 will weigh 50 kilograms, and will operate in a low-Earth orbit 500 kilometers above Earth and move at 7.9 km per second.
Yang Tianliang, director of the institute and chief designer of the constellation, said in a phone interview on Wednesday that Hainan 1 satellites will carry two types of instruments - cameras and identification technology.
"The combination of cameras and automatic identification systems will allow us not only to monitor ships lawfully sailing in the South China Sea, but also to detect and track illegally operating ones," Yang said.
Automatic identification systems can receive and process signals concerning positioning data, courses of vessels as well as speed readings sent by a moving ship. The technology is often mounted on ships and satellites and assists vessel operators in understanding maritime traffic situations while also helping maritime authorities to track and monitor vessel movements.
Yang said Hainan administers hundreds of islands and reefs in the South China Sea, so it requires the assistance of a space-based platform to monitor these territories and surrounding waters.
He also noted that once the satellite network becomes fully operational by 2021, it will be able to cover the entire South China Sea and will be very helpful in a wide range of sectors, such as marine transportation, fisheries, island management and maritime search and rescue.
Gao Enyu, a manager from Hainan MinoSpace Technology Co, was quoted by China News Service as saying on Tuesday that researchers optimized Hainan 1's cameras to make them suitable for monitoring large expanses of waters.
He added that the satellite is capable of detecting and identifying all midsize and large vessels.
Gao's company is in charge of the research and development of some of Hainan 1's equipment.
China's IoT satellites complete phase-1 in-orbit tests
Source: Xinhua| 2020-06-12 20:58:00|Editor: huaxia
Two satellites, Xingyun-2 01 and 02, are launched by a Kuaizhou-1A (KZ-1A) carrier rocket from the Jiuquan Satellite Launch Center in northwest China, May 12, 2020. (Photo by Shan Biao/Xinhua)
WUHAN, June 12 (Xinhua) -- Two satellites for China's space-based Internet-of-Things (IoT) project have completed phase-1 tests in orbit, sources with the China Aerospace Science and Industry Corporation said.
The satellites, Xingyun-2 01 and 02, were launched by a Kuaizhou-1A carrier rocket on May 12 from the Jiuquan Satellite Launch Center.
Engineers tested the satellite platforms, payloads, and key technologies such as inter-satellite links. The results were in line with expectations, the corporation said.
Additional in-orbit tests will be continued for the completion of the Xingyun project, China's first self-developed, space-based IoT constellation.
The project is anticipated to solve problems detected in the IoT businesses' communication blind-zone, as a result of deficient coverage of cellular wireless communication networks.
By around 2023, the Xingyun project will have completed construction of the space-based IoT constellation with 80 low-orbit communication satellites.
The Xingyun-2 01 and 02 satellites employ the technology of inter-satellite laser links, which enables the in-orbit satellites to communicate over long distances and hence upgrade the real-time performance of communication services.
10:51, 20-Aug-2020央视新闻
17分钟前 来自 微博 weibo.com
【转发祝贺!#高分七号卫星发射成功#】记者从国家航天局获悉,今天11时22分,我国在太原卫星发射中心用长征四号乙运载火箭,成功发射高分七号卫星。高分七号卫星是我国首颗民用亚米级光学传输型立体测绘卫星。该星运行后将在国土测绘、城乡建设、统计调查等方面发挥重要作用。(央视记者李厦)
CCTV News
17 minutes ago from Weibo
[Forward congratulations! #高分七号号 successfully launched #[威武]]
The reporter learned from the National Space Administration that at 11:22 today, China used the Long March 4B carrier rocket at the Taiyuan Satellite Launch Center to successfully launch the Gaofen-7. The Gaofen-7 is China's first civilian sub-meter optical three dimension mapping satellite. After the satellite begin operation, it will play an important role in land surveying and mapping, urban and rural construction, and statistical surveys. (CCTV reporter Li Xia)
林晓弈
4分钟前 来自 微博 weibo.com
此次发射任务成功验证了基于栅格舵系统的一子级落区控制技术,该技术的应用将为后续重复使用运载火箭的研制奠定了坚实的技术基础。 ¡查看图片
4 minutes ago from Weibo
The launch mission successfully verified first stage drop-zone control technology based on the grid fin system. The application of this technology will lay a solid technical foundation for the subsequent development of reusable launch vehicle. ¡ view image
10:51, 20-Aug-2020
China's Gaofen-7 satellite officially put into use
CGTN
China's Earth observation satellite Gaofen-7 has been officially put into use, according to the China National Space Administration on Thursday.
Launched on November 3, 2019, Gaofen-7 is an important part of China's high-definition Earth observation project. It's the country's first civil-use optical transmission three-dimensional surveying and mapping satellite that reaches the sub-meter definition.
Gaofen-7 will help solve problems in monitoring geographical conditions, housing and urban-rural construction and national statistics, according to Xinhua News Agency quoting chief designer of the Gaofen-7 at the China Academy of Space Technology.
Inter-satellite laser communication is a communication method that uses laser beams to transmit images, voices, signals and other information in space. It has high transmission rate, strong anti-interference ability, small system terminal size, light weight, and low power consumption. The advantage can greatly reduce the dependence of the satellite constellation system on the ground network, thereby reducing the number and construction cost of ground stations, expanding the coverage area, and realizing global measurement and control.航天见闻 【“行云二号”两颗卫星实现双向通信,激光链路技术得到成功验证】近日,“行云二号”01星、02星之间实现了建链流程完整、遥测状态稳定的双向通信,这意味着“行云二号”卫星搭载的激光通信载荷技术得到成功验证,我国卫星物联网星座实现星间激光通信零的突破。至此,两颗卫星自今年5月12日发射入轨开展在轨技术测试以来,所有核心技术均得到充分验证。目前,星间激光链路技术已成为全球卫星通信系统发展的关键技术。公开资料显示,全球中低轨道星座项目中,仅有美国的Starlink星座、LeoSat星座提出了采用星间激光链路实现空间组网的计划。而在国内,行云公司抓总研制了国内最小的星间激光通信载荷,实现了国内卫星物联网星座激光通信零的突破,打通了卫星物联网星座间信息传输的瓶颈制约。
Aerospace experience
Today 13:47 from aerospace
[Two satellites of "Xingyun-2" realize two-way communication, and the laser link technology has been successfully verified]
Recently, "Xingyun-2" 01 and 02 have achieved two-way communication with full complete link establishment under stable telemetry status. This means that the laser communication payload technology carried by the "Xingyun-2" satellite has been successfully verified. Ever since the two satellites were launched into orbit on May 12 this year to carry out in-orbit technical testing, all core technologies have now been fully verified.
At present, inter-satellite laser link technology has become a key technology for the development of global satellite communication systems. Public information shows that among the global low and medium orbit constellation projects, only the Starlink constellation and LeoSat constellation in the United States have proposed plans to use inter-satellite laser links to achieve space networking. In China, Xingyun has developed the smallest inter-satellite laser communication payload in China, achieving a breakthrough in laser communication, and fixed the bottleneck of inter satellite information transmission of IoT constellation.