China satellites info, news & updates

[Economic superpower]

Xu Wen , director of the China Centre for Resources Satellite Data and Application, said the high-resolution photos meant tracking stations would have to cope with a large amount of receiving data, according to an interview posted on the website of State Administration of Science, Technology and Industry for National Defence on Monday.

Unlike that of the United States, which has built a large number of ground stations worldwide, the programme can only download data when the satellite passes over the country.

Gaofen 2 is also China's first "smart satellite", meaning it is able to stop shooting when flying above cloudy areas, thus collecting only the highest quality images, Xu said.

A satellite expert at the Chinese Academy of Sciences said the earth observation satellite programme had developed slowly, with lower resolutions than the best satellites overseas.

Gaofen 2's camera has a resolution of 80cm - meaning it can see objects that are just 80cm. By comparison, WorldView-3, a commercial satellite launched last month in the US, had a resolution of 31cm.

"The hi-tech embargo imposed by the US and other developed countries has forced Chinese researchers to develop much of this technology from scratch, and it's been a long and painful process," said the expert, declining to be named.

But Beijing places more stringent limits on the commercial use of satellite images than the US, due to national security concerns. While Google Maps can provide a 50cm resolution, Chinese digital map service providers such as Baidu and Sohu are restricted to 20 metres.

Source?

 

[cirr]

武汉大学珞珈一号卫星(Luojia-1)：2016年9-10月发射

张衡一号(ZH-1)电磁监测试验卫星：预计01星在2017年8月发射，并启动02星研制工作

L-InSAR双星和GEO-SAR卫星——“十三五”雷达卫星工程

神舟十一号飞船(SZ-11)：2016年8月13日下午，飞船运抵酒泉卫星发射中心

神舟十二号飞船(SZ-12)：对接2018年发射升空的空间站核心舱

 

[BoQ77]

The big difference I found on GF-3 specs compared to GF-2 is not the higher resolution
BUT the lifetime 8 years instead of 5 years

 

[GS Zhou]

The big difference I found on GF-3 specs compared to GF-2 is not the higher resolution
BUT the lifetime 8 years instead of 5 years

Can you stop making comments on topics that you have no idea at all??

Gaofen-2 is an optical satellite; Gaofen-3 is a radar satellite (C-band SAR). That's the core difference between the two. Optical satellite could achieve higher resolution, but it only works in day time with good weather; radar satellite could work in nights or bad weathers (e.g. clouds).

Again, pls stop making comments on topics that you have no clue at all!

@waz @Hu Songshan sirs, I'm reporting this Vietnam PDFer, who makes trolls on almost every China-related thread. Can we take some actions to stop his trolling? Many thanks!

 

[BoQ77]

sirs, I'm reporting this Vietnam PDFer, who makes trolls on almost every China-related thread. Can we take some actions to stop his trolling? Many thanks!

My post isn't spam, or troll. What you reported ?
Ah Gaofen-2 based on CS-L3000A
while Gaofen-3 based on CS-L3000B

 

[GS Zhou]

My post isn't spam, or troll. What you reported ?

you claim you've done research on the two GF satellites, but you even could NOT identify the core difference between the two. Your post here could only waste the PDF bandwith and time of other PDF readers. The reading environment on PDF could only become worse, if no serious actions taken to stop the trolling like yours.

 

[BoQ77]

They used to hide in rat holes. but weapons have got so powerful they no longer can hide in rat holes

I reported this for insulting others

Where can the Vietnamese hide in the coming days?

I report this post because he bring Vietnam to this. Let read carefully about purpose of Gaofen-3
@waz please help, they keep brag Vietnam into their trolling

 

[TaiShang]

China to launch world's first quantum communication satellite "Micius"
(Xinhua) August 15, 2016

JIUQUAN, Aug. 15 (Xinhua) -- The world's first quantum communication satellite, which China is preparing to launch, has been given the moniker "Micius," after a fifth century B.C. Chinese scientist, the Chinese Academy of Sciences (CAS) announced Monday.

Micius was a philosopher as well as a scientist. He discovered that light travels in straight lines more than 2,000 years ago and was likely the first person to record an image with a pinhole.

"Just like the Galileo satellites and Kepler telescopes, we used the name of a famous scholar for our first quantum satellite. We hope this will promote and boost confidence in Chinese culture," said Pan Jianwei, quantum communication satellite project chief scientist.

According to CAS, the quantum satellite will conduct experiments on high-speed quantum key distribution between the satellite and ground stations, as well as explore quantum teleportation for the first time in the world.

 

[Skull and Bones]

0.8-1 m resolution is not really world beating.

 

[waz]

Where can the Vietnamese hide in the coming days?

Folks this prompted the Vietnamese posters to come here.
Also @BoQ77 when facts are being presented to you, please respond with evidence of your own.

 

[BoQ77]

Folks this prompted the Vietnamese posters to come here.
Also @BoQ77 when facts are being presented to you, please respond with evidence of your own.

Thank you.
these guy feel they could insult freely behind our back, but jump up and down when we come in F2F.

 

[beijingwalker]

China is about to launch an un-hackable satellite and take the lead in a new space race


August 16, 2016

n the next few days, China plans to launch a quantum satellite into orbit around Earth.

And with that rocket launch, the country is poised to take the lead in a new space race.

That's because the satellite, QUESS, is virtually un-hackable.

QUESS will use an advanced form of communication built on quantum computing. If a third party tries to hack it, then this method could change the message or cancel it so the third party will never see it.

As major countries reportedly hack each other with increasing frequency, secure communications have become increasingly important to national security. Right now, quantum cryptography looks like our best alternative for the future, information technology expert Ron Steinfeld writes for The Conversation.

And China is pouring more money and focus into the field than the US is, The Wall Street Journal reports. The US doesn't have any concrete plans for a quantum satellite at the moment.

(Astronauts Zhang Xiaoguang, Nie Haisheng, and Wang Yaping salute after returning to Earth in China's Shenzhou 10 spacecraft on June 26, 2013, after successfully docking with a crewed space laboratory.REUTERS)

The nearly 1,400-pound QUESS will be the first quantum satellite to go into space, and it will allow Chinese researchers to test sending quantum information farther than ever before.

The longest distance researchers have sent quantum keys over so far is 190 miles, according to a study in Nature Photonics. QUESS will try to send quantum information from the ground to the satellite's orbit 310 miles up, Pan Jianwei, the project's chief scientist, told China Central Television.

The Chinese researchers think that they will be able to send quantum information over larger distances in space because the packets of light called photons carrying it travel more smoothly there, according to Nature.

(The Long March 3B rocket, carrying China's Chang'e 3 lunar probe, blasts off in 2013. A similar rocket will launch QUESS into orbit.REUTERS/China Daily )
While experts predict that we — or, more accurately, very smart quantum computers we create — might be able to hack quantum cryptography one day, the method is pretty much the most secure option we have for now.

Chaoyang Lu, a physicist on the QUESS team, told Nature in July that he thinks the satellite's launch will spark a new space race.

If QUESS works, China could launch more quantum satellites to build an encrypted, global communication network.

Then, if American scientists figure out how to hack quantum cryptography, for example, Chinese scientists could have to develop an even more secure version of it — and so on and so on.

The quantum space race has begun.

http://finance.yahoo.com/news/china-launch-un-hackable-satellite-192339706.html

 

[GS Zhou]

It's not about to launch. We've done it!!

 

[艹艹艹]

 

[TaiShang]

Done! World's first quantum satellite.

**

China launches first-ever quantum communication satellite
Xinhua, August 16, 2016

China successfully launched the world's first quantum satellite from the Jiuquan Satellite Launch Center in northwestern Gobi Desert at 1:40 am on Tuesday. [Photo/Xinhua]

China successfully launched the world's first quantum satellite from the Jiuquan Satellite Launch Center in northwestern Gobi Desert at 1:40 a.m. on Tuesday.

In a cloud of smoke, the satellite, Quantum Experiments at Space Scale (QUESS), roared into the dark sky on top of a Long March-2D rocket.

The 600-plus-kilogram satellite will circle the Earth once every 90 minutes after it enters a sun-synchronous orbit at an altitude of 500 kilometers.

It is nicknamed "Micius," after a fifth century B.C. Chinese philosopher and scientist who has been credited as the first one in human history conducting optical experiments.

In its two-year mission, QUESS is designed to establish "hack-proof" quantum communications by transmitting uncrackable keys from space to the ground, and provide insights into the strangest phenomenon in quantum physics -- quantum entanglement.

Quantum communication boasts ultra-high security as a quantum photon can neither be separated nor duplicated. It is hence impossible to wiretap, intercept or crack the information transmitted through it.

With the help of the new satellite, scientists will be able to test quantum key distribution between the satellite and ground stations, and conduct secure quantum communications between Beijing and Xinjiang's Urumqi.

QUESS, as planned, will also beam entangled photons to two earth stations, 1,200 kilometers apart, in a move to test quantum entanglement over a greater distance, as well as test quantum teleportation between a ground station in Ali, Tibet, and itself.