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Beidou navigation system, an alternative to US-operated GPS [Copy link] 中文

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Post time 2015-7-27 16:03:43 |Display all floors
(From Xinhua)
  With the launch of two navigation satellites on Saturday, China made another solid step toward building it's own positioning system with global coverage, a leading scientist said on Sunday.
  Scientists put two satellites for the Beidou Navigation Satellite System, a domestic alternative to the United States-operated GPS, into orbit on Saturday at midnight.
Xie Jun, chief engineer of the Beidou project, said the two satellites are designed to be trailblazers as the Beidou system expands its coverage globally.
Named after the Chinese term for the Big Dipper constellation, the Beidou project was launched in 1994, some 20 years after the inception of GPS. The first Beidou satellite was launched in 2000.
  By 2012, a regional network had taken shape, and the Beidou system was providing positioning, navigation, timing and short-messaging services in China and several other Asian countries.
  Beidou is now one of the four dominant navigation systems worldwide, along with GPS, Russia's Glonass and the European Union's Galileo.
   The plan is to set up a "constellation" of 35 navigation satellites and expand their coverage to the whole world by 2020. Saturday's launch of the two satellites - the 18th and 19th of the Beidou project and the third this year - and their mission to test navigation signaling and intersatellite links, forms a large part of this plan, Xie said.
  "We have deployed a new type of signal format for the two satellites that enables us to double the data exchanged between satellites in a given time," he said. "That means faster and better service for Beidou clients."
  Xie said scientists will examine the satellites' distance measurement and anti-jamming capabilities. They will also join the pair with the 17th Beidou satellite, launched in late March, in a mission to test intersatellite connectivity.
  The intersatellite links will also allow Beidou satellites to connect with their GPS and Glonass counterparts.
  "The edge in compatibility allows Beidou clients to use GPS data for corrections in positioning in order to improve service accuracy and convenience," Xie said.
"Although we started late, Beidou can now almost rival the general performance of any foreign counterparts. We may even have a slight edge in regional enhanced services, positioning reports and short-messaging services," he said. Xie said 98 percent of the components for the satellites launched on Saturday were made domestically.
These include rubidium atomic clocks. Dubbed the "heart" of the navigation satellites, these clocks are work-horses that send synchronized signals so that receivers can triangulate their position on Earth.




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Post time 2015-7-27 16:48:43 |Display all floors
Which one do you trust the original or the copy?

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Post time 2015-7-27 19:03:08 |Display all floors
dusty1 Post time: 2015-7-27 16:48
Which one do you trust the original or the copy?

This is not a matter of trust.
For the 1,300 million Chinese people within their homeland only one thing counts.
Effectiveness and home-made-ness. Chinese folks are a proud one, nothing will and can change this
healthy attitude.
Australians are just the same, be proud of yourself regardless of size or wealth.   

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Post time 2015-7-27 19:07:40 |Display all floors
emanreus Post time: 2015-7-27 19:03
This is not a matter of trust.
For the 1,300 million Chinese people within their homeland only one ...

At the moment I have a house full of Chinese, looking forward to 16 days time when they leave and I get my house back

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Post time 2015-7-27 19:14:42 |Display all floors
dusty1 Post time: 2015-7-27 19:07
At the moment I have a house full of Chinese, looking forward to 16 days time when they leave and  ...

Make the best out of it and you will not regret it - Ever.
However, I do get your message

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Post time 2015-7-27 19:49:07 |Display all floors
emanreus Post time: 2015-7-27 19:03
This is not a matter of trust.
For the 1,300 million Chinese people within their homeland only one ...

Are they? Just returned to China from Japan and watched the Chinese coming back loaded up with japanese products that they see as better than those made in China.

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Post time 2015-7-27 19:50:20 |Display all floors
Hope it works better than the Chinese mapping systems out there at the moment such as those that still do not know the Hangzhou Bay Bridge exists

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