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New China-Brazil earth resource satellite sent into space
Source: Xinhua| 2019-12-20 12:05:07|Editor: Yurou
TAIYUAN, Dec. 20 (Xinhua) -- A new satellite, jointly developed by China and Brazil, was sent into space on Friday, pushing forward the aerospace cooperation between the two countries, according to the China National Space Administration.
The China-Brazil Earth Resource Satellite-4A was launched on a Long March-4B carrier rocket at 11:22 a.m. Friday Beijing Time from the Taiyuan Satellite Launch Center in north China's Shanxi Province.
The satellite is the sixth satellite under the earth resource satellite cooperation program between the two countries. It will obtain global optical remote-sensing data and support the Brazilian government's monitoring of the Amazon rainforest and the country's environmental changes.
The satellite was jointly developed by the China Academy of Space Technology and the National Institute for Space Research of Brazil. The carrier rocket was developed by the Shanghai Academy of Spaceflight Technology.
By the same rocket, another eight satellites were put into orbit, including a wide-range multispectral remote-sensing microsatellite donated to Ethiopia.
林晓弈China launches heaviest satellite to test key technologies
Source: Xinhua| 2019-12-27 22:14:33|Editor: Mu Xuequan
Long March-5 Y3 blasts off from Wenchang Space Launch Center in south China's Hainan Province, Dec. 27, 2019. The rocket, coded as Long March-5 Y3, blasted off from the coastal launch center at 8:45 p.m. (Beijing time), carrying the Shijian-20 technological experiment satellite weighing over eight tonnes, the heaviest and most advanced communications satellite of the country. About 2,220 seconds later, the satellite was sent into its planned orbit. (Xinhua/Yang Guanyu)
by Xinhua writers Quan Xiaoshu, Yu Fei
WENCHANG, Hainan, Dec. 27 (Xinhua) -- Aboard the third Long March-5 rocket, China's largest carrier rocket, Shijian-20, a new technology test and verification satellite, successfully entered its orbit Friday night.
The rocket, coded as Long March-5 Y3, blasted off from the Wenchang Space Launch Center in south China's Hainan Province at 8:45 p.m. (Beijing time).
Shijian-20, weighing more than eight tonnes, is the country's heaviest and most advanced communications satellite in geosynchronous orbit, according to its maker, the China Academy of Space Technology (CAST) under the China Aerospace Science and Technology Corporation (CASC).
It will carry out orbit experiments for a series of key technologies, the CAST said in a press release.
It will demonstrate in orbit its heat transfer technology based on cryogenic loop heat pipes, an efficient thermal control device for space applications, to lay the foundation for the development of highly sensitive space probes.
The satellite will test the controllable deformation of shape memory polymers, a type of smart material that can switch between temporary shapes, to pave the way for the development of large variable space structures.
It will also carry out satellite-ground communication tests using Q/V bands, which lie between 33-75 GHz, within the extremely high frequency (EHF) area of the radio spectrum. These frequencies are used mainly for satellite communications.
"The major way to improve the satellite communication capacity is to expand the bandwidth of available frequency bands. If we liken the geostationary orbit to an expressway, which is now the most crowded in space, the use of Q/V bands will help to widen the expressway by four to five times," said Li Feng, chief designer of the satellite with the CAST.
The test is key to the development of the next generation of high throughput satellites capable of delivering 1Tbps bandwidth for ultrafast speeds, he said.
Shijian-20 has the largest solar wings among all China's satellites, with the total wingspan 10 meters wider than that of a Boeing 737 aircraft.
The solar wings will unfold twice, the first time after the satellite enters its orbit and the second after it flies around the orbit for about a week. The increase of the solar wing area will supply the satellite with abundant power.
The satellite adopts a hybrid propulsion system. Chemical propulsion is powerful but inefficient, and is used in rapid orbit change or satellite attitude adjustment to send it to the planned orbit as soon as possible. Electric propulsion is more precise and efficient but less powerful, which is suitable for long-term delicate adjustments in orbit.
Electric propulsion is also a preferred technology for future deep space exploration. Missions to explore Mars, Jupiter and asteroids are all too far away from Earth to be fulfilled by chemical propulsion alone, as it is impossible to bring the amount of fuel needed.
Shijian-20 will also test the adaptability of the DFH-5 satellite platform, which may serve the needs of high-capacity satellites for high orbit communications, microwave remote sensing, optical remote sensing, space scientific exploration, in-orbit service and other purposes in the next 20 years.
"With the government's consistent support for the communications satellite industry in the past decades, we have developed the DFH-3 and DFH-4 satellite platforms, making China one of the few countries in the world that can independently develop large communications satellites and provide in-orbit commercial services," said Hao Yanyan, product assurance manager of Shijian-20 with the CAST.
So far, there are more than 20 communications satellites based on the DFH-4 platforms running stably in orbit.
To meet the pressing needs of economic development, the research and development of the DFH-5 platform started in 2010.
According to the design, the takeoff weight of a satellite based on the DFH-5 platform can reach eight to nine tonnes, and its payload capacity 1,500 to 1,800 kg. The power for the whole satellite is more than 28 kilowatts, while the power for its payload above 18 kilowatts.
"According to these technical indicators, a satellite based on the DFH-5 platform in orbit can provide services equivalent to that of two or three satellites on the DFH-4 platform," Hao said.
The new technologies verified by Shijian-20 will further promote the development of new satellites, especially the high throughput communications satellite and high resolution remote sensing satellite, which is of great significance to the progress of China's space technology, Li said.
LIPS-300 ion engine
China Aerospace Science and Technology Corporation
VIDEO: Shijian-20 Satellite 实践-20号卫星China Aerospace Science and Technology Corporation
Today 11:24
[Shijian-20 satellite successfully positioned! The first successful flight of the Dongfanghong-5 satellite bus/platform】
On January 5th, the Shijian 20 satellite that was developed by the Fifth Academy of the Aerospace Science and Technology Corporation, after going through seven orbital maneuvers, was successfully positioned at a geosynchronous orbit at an altitude of 36,000 kilometers, marking the first successful flight of the Dongfanghong-5 bus/platform based satellite. The launch weight of the Shijian 20 satellite is slightly more than 8 tons, and the localization rate reaches 100%. This is among the satellites ever developed by China, the heaviest, highest technological content HEO satellite with a design life of 16 years, and it is equipped with more than 10 internationally leading technology verification loads.
ZJU researchers design optical cameras mounted on Long March 5 latest mission | Zhejiang University林晓弈
今天 11:33 来自 航爱网牌Android 已编辑
今天早上三点左右,第七次变轨成功完成,随后,太阳能帆板二维二次展开成功,热辐射器和三重叠天线均成功展开,任务圆满成功!航天爱好者网超话 ¡查看图片
Today 11:33
At about three o'clock this morning, the seventh orbital change was successfully completed. Subsequently, the solar panel was successfully deployed two-dimensionally. The thermal radiator and the three overlapping antennas were successfully deployed. The mission was a complete success! 超 Aerospace enthusiast network super words ¡ view image
China Telecom launches service packages for satellite communications to the public - cnTechPostChina launches first mobile telecom satellite
Source: Xinhua | 2016-08-06 01:15:28 | Editor: huaxia
Photo taken on Aug. 6, 2016 shows the Tiantong-01 satellite is launched with the Long March-3B carrier rocket at southwestern China's Xichang Satellite Launch Center. The Tiantong-01 satellite is the first satellite of China's home-made satellite mobile telecom system, and a key part of the country's space information infrastructure.(Xinhua/Du Cai)
XICHANG, Sichuan, Aug. 6 (Xinhua) -- China on early Saturday successfully launched the first satellite for mobile telecommunication.
The Tiantong-01 satellite was launched at 00:22 a.m. Beijing Time, at southwestern China's Xichang Satellite Launch Center, with the Long March-3B carrier rocket.
It is the first satellite of China's home-made satellite mobile telecom system, and a key part of the country's space information infrastructure.
More geostationary satellites will be sent into orbit for the system.
Tiantong-01 was designed by China Academy of Space Technology and its ground service will be operated by China Telecom. It will establish a mobile network with ground facilities, providing services for China, the Middle East, Africa and other areas.
The Long March-3B carrier rocket was produced by China Academy of Launch Vehicle Technology. It was the 232nd flight of the Long March series carrier rockets, and the 36th launch of the Long March-3B.
Our space我们的太空
2分钟前 来自 微博 weibo.com
【一箭四星!圪梁梁里传喜讯!】2020年1月15日10时53分,我国在太原卫星发射中心用长征二号丁运载火箭,成功将亚米级超大幅宽商业光学遥感卫星“吉林一号”宽幅01星(又称“红旗一号—H9”)发射升空,任务获得圆满成功。此次任务还搭载发射了NewSat7/8卫星、天启星座05星等3颗小卫星。
这是长征系列运载火箭的第325次航天飞行。(拍摄:史悦)#中国航天# #我们的太空#