诛仙紫金葫芦共乘:China's indigenous global navigation system b...

来源：百度文库 编辑：九乡新闻网 时间：2024/04/29 03:26:18

China's indigenous global navigation system built up

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2011-4-11 11:59




China launches satellite for indigenous global navigation (Times of India)


China early on Sunday morning launched its eighth orbiter which will form part of its indigenous satellite-navigation and positioning network.


A Long March-3A carrier rocket carrying the "Beidou" or Compass, navigation satellite took off at 4.47 a.m. Sunday from the Xichang Satellite Launch Center in southwest China's Sichuan Province, Xinhua reported.


The launching of the satellite marks the establishment of a basic system for the navigation and positioning network, said an unidentified spokesperson for the Xichang Satellite Launch Centre.


NASA Spacefight.com: China kicks off their big 2011 push with BeiDou-2 launch


The first Chinese launch in 2011 took place at 20:47UTC on Saturday (April 9), as their Chang Zheng-3A (Long March 3A) launch vehicle orbited the third BeiDou-2 a navigation satellite, following lift-off from the Xi Chang Satellite Launch Center, in Sichuan Province.


This constellation of satellites – developed in the basis of the DFH-3 satellite platform and have a lifespan of eight years – will consist of 35 vehicles. The Compass Navigation Satellite System (CNSS) is China’s second-generation satellite navigation system capable of providing continuous, real-time passive 3D geo-spatial positioning and speed measurement.


The system will initially used to provide high-accuracy positioning services for users in China and its neighboring regions, covering an area of about 120 degrees longitude in the Northern Hemisphere. The long-term goal is to develop a global navigation satellite network similar to the US GPS and Russian GLONASS systems.


The first phase of the project will be focused on the coverage of the Chinese territory, but in the future the Compass constellation will cover the entire globe.


With the Space Shuttle retiring in June, Russia will effectively taking over as the world’s leader in space via its global frequency of launches and manned space flight capability to the International Space Station (ISS).


However, China has one eye on second place as it ramps up its launch schedule, which includes the lofting of the TG-1 TianGong-1 Space Station in the middle of the year. Soon after, Shenzhou-8 will be launched unmanned to test the rendezvous and docking procedures on a multiple week mission. If everything goes according to plan, manned flights will follow with Shenzhou-9 and Shenzhou-10 in 2012.


NASA/BBC/The Times of India


--------Comments from Chinese side------


Another small step for Beidou

China launched its eighth Beidou satellite yesterday to join seven already in orbit.

The navigation and positioning network will eventually consist of more than 30 satellites covering the entire world.

A Long March-3A carrier rocket carrying the Beidou, or Compass, navigation satellite took off at 4:47am from the Xichang Satellite Launch Center in southwest China's Sichuan Province.

The launch marked the establishment of the basic system of the navigation and positioning network, said a spokesman.

China will launch more satellites over the next two years to complete a regional network providing precise navigational services for industries and sectors such as mapping, fishing, transport, meteorology and telecommunications in the Asia-Pacific regions, the spokesman said.

The Beidou system is still under test, mainly in China, providing positioning, navigation and telecommunication services. The services will expend to users in the Asia Pacific region in 2012 and a global service is expected to be in operation by 2020.

It is expected that Beidou services will be available at a cheaper price than the current Global Positioning System.

A Beidou system will cost around 100 yuan (US$15), Liu Jingnan, of the Chinese Academy of Engineering, said. That's about a fifth of the GPS price.
The system can also be used for telecommunications, Liu added.

Experts say Beidou is one of the four leading navigation satellite systems in the world together with the United States' GPS, Europe's Galileo and and Russia's Glonass.

Currently, the Beidou system is being used for military, agricultural and fishery purposes. Liu said it will be applied to much wider areas such as engineering monitoring, traffic management and rescue misssions in the future.

But Beidou faces challenges ahead.

Li Zuhong, the deputy chief designer of the system, told a forum in March that "the speed of overall deploy is very important for Beidou as GPS leads the way ahead." The statellite design also needs "constant innovation as well as investment during its development," Li said.
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