China's Space Program News Thread

[escobar]

The first tank of the LM-7 rocket has been completed. It uses new materials, new structures, has a thickness of only 1.7 mm. Three-dimensional digital manufacturing process has been employed.

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[escobar]

China will start a manned lunar mission after the sampling of the moon’s surface is done around 2020...

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China is building a highly accurate navigation system, the Ministry of Science and Technology said.

On Tuesday, the ministry released a report on its website on a strategy seminar recently held in Beijing to discuss the latest progress in navigation technologies.

The National Remote Sensing Center of China said at the seminar that a new navigation system has been successfully tested to pinpoint positions within 0.1 meters in outdoor areas and 3 meters in indoor areas. The Xihe system, named after a god in ancient China, has already been tested on fieldwork devices.

The center plans to develop an urban positioning system, first in large cities like Shanghai, and then across the country by the end of the 12th Five-Year Plan (2011-15).

"When you're using a navigation system like GPS in your car, the pinpoint accuracy is about 10 meters, so you will sometimes find that your actual position differs from what is shown on the navigator," said the project leader at the National Remote Sensing Center, who declined to be named due to internal regulations.

"But if you're using the Xihe system you will not have that problem, because the accuracy is 0.1 meter," the director said.

The system is based on a technology known as CRP, or Cooperative Real-time Precise positioning, which is designed to enhance the accuracy of navigation satellite systems.

There are four major navigation satellite systems: the Global Positioning System, or GPS, of the United States, Russia's Glonass, the European Union's Galileo, and China's Beidou.

Cao Jianlin, vice-minister of science and technology, said that the Xihe system is one of the country's major attempts to apply science and technology funds to solve practical problems and catch up in terms of high tech

 

[Hendrik_2000]

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China builds highly accurate navigation system
By Cheng Yingqi (Chinadaily.com.cn)
13:32, October 11, 2012

China is building a highly accurate navigation system, the Ministry of Science and Technology said.

On Tuesday, the ministry released a report on its website on a strategy seminar recently held in Beijing to discuss the latest progress in navigation technologies.

The National Remote Sensing Center of China said at the seminar that a new navigation system has been successfully tested to pinpoint positions within 0.1 meters in outdoor areas and 3 meters in indoor areas.

The Xihe system, named after a god in ancient China, has already been tested on fieldwork devices.

The center plans to develop an urban positioning system, first in large cities like Shanghai, and then across the country by the end of the 12th Five-Year Plan (2011-15).

"When you're using a navigation system like GPS in your car, the pinpoint accuracy is about 10 meters, so you will sometimes find that your actual position differs from what is shown on the navigator," said the project leader at the National Remote Sensing Center, who declined to be named due to internal regulations.

"But if you're using the Xihe system you will not have that problem, because the accuracy is 0.1 meter," the director said.

The system is based on a technology known as CRP, or Cooperative Real-time Precise positioning, which is designed to enhance the accuracy of navigation satellite systems.

There are four major navigation satellite systems: the Global Positioning System, or GPS, of the United States, Russia's Glonass, the European Union's Galileo, and China's Beidou.

Cao Jianlin, vice-minister of science and technology, said that the Xihe system is one of the country's major attempts to apply science and technology funds to solve practical problems and catch up in terms of high tech.

The new maritime optical surveillance satellite network and now we have highly accurate positioning system couple with new fast Intermediate Ballistic Missile seem to me they are just about have all the building block of AShBM

 

[bladerunner]

I remember reading sometime back, that unlike the other systems whose satellites use a medium earth orbit, the Chinese Beidou system uses geostationary satellites which means that although one does not require as many satellites, it limits coverage to areas on Earth where you can see the satellites.

 

[Quickie]

I remember reading sometime back, that unlike the other systems whose satellites use a medium earth orbit, the Chinese Beidou system uses geostationary satellites which means that although one does not require as many satellites, it limits coverage to areas on Earth where you can see the satellites.

Only 5 of the 35 Beidou satellites are in GEO. The rest are in MEO. Coverage is limited to the pacific area because they've sent up only about half of the network of satellites. AFAIK, Global coverage is expected to be in 2020.

 

[jackliu]

Only 5 of the 35 Beidou satellites are in GEO. The rest are in MEO. Coverage is limited to the pacific area because they've sent up only about half of the network of satellites. AFAIK, Global coverage is expected to be in 2020.

What I like best about Beidou is the ability to send SMS text for free. Great for emergency situations.

 

[Equation]

What I like best about Beidou is the ability to send SMS text for free. Great for emergency situations.

I wonder if the Beidou is the only one that can do that?

 

[bladerunner]

I wonder if the Beidou is the only one that can do that?

You've lost me.

if you havent paid your cell phone bill you get disconnected, so you wont be sending anything.

Isnt the cost of sending texts up to your chosen cell phone service provider?

we can send several thousand texts nationwide for a few dollars a month, the only major costs are for international texts in which case, having a smart phone i use :"Whats App" thats free, works just like text and quicker/better than internet mail.

 

[lostsoul]

Only 5 of the 35 Beidou satellites are in GEO. The rest are in MEO. Coverage is limited to the pacific area because they've sent up only about half of the network of satellites. AFAIK, Global coverage is expected to be in 2020.

The race is on between the Euro Galileo and Beidou 2 to send their sats up over Europe because both share very similar frequencies. As it currently stands which ever country is first to send a signal from a satellite then that frequency "belongs" to said country.