04/04/2015
Beidou Goes Global
China launched a new-generation satellite into space on Monday night, starting the expansion of its indigenous navigation and positioning network to global coverage. The satellite, the 20th for the Beidou Navigation Satellite System, was sent into orbit by the Yuanzheng-1 upper stage vehicle after being lifted by a Long March-3C carrier rocket from the Xichang Satellite Launch Center in Sichuan province.
The launch is the first step in China's plan to turn the navigation system's current regional service into global coverage, according to a statement issued by the center. China launched the first Beidou satellite in 2000. The system began providing positioning, navigation, timing and short-message services to civilian users in China and surrounding areas in the Asia-Pacific region in December 2012. Currently, the system consists of 15 satellites.
The latest satellite will test a host of new technologies essential for the global transformation, including a cutting-edge navigation signaling mechanism and advanced links between satellites.
China Aerospace Science and Technology Corp, one of the major players in the nation's space activities, said in a statement that Monday's launch also marked the first flight of the Yuanzheng-1 upper stage vehicle developed by its China Academy of Launch Vehicle Technology.
The independent vehicle-dubbed a "shuttle bus in space" by some experts-is capable of sending multiple spacecraft into different orbits during a single mission. It is able to ferry satellites using its own power system after reaching an initial orbit atop a rocket, said Liang Xiaohong, vice-president of the academy.
"The Yuanzheng-1 will play an important role in China's future moon and Mars exploration projects and space debris disposal tasks," he said. "In the past, our satellites had to install engines for their orbital transfer, and they carried a lot of fuel. Now the upper stage vehicle enables us to remove the engines and fuel from the satellite and prolong its life span."
The adoption of the cutting-edge spacecraft will also help to reduce costs for satellite launches and meet rising demand for spaceflight, Liang said.
-Chinadaily
BEIJING, April 1 (Xinhua) -- China plans to launch three or four more satellites for its indigenous global navigation and positioning network this year, the network's chief designer said.
A complete network will take shape by 2020, Yang Changfeng, chief designer of the BeiDou Navigation Satellite System (BDS), was quoted saying by the PLA Daily on Wednesday.
The 17th satellite in the BDS global network was launched on Monday, marking the first step to expand it from a regional to global service.
The BDS global network will be made up of 35 satellites, five of which will be in geostationary orbit.
Compared with the satellites already in operation, the latest has longer life and higher accuracy, Yang said.
Its service life is around ten to 12 years compared with eight years of the old model, and the maximum accuracy is two to three meters, he said.
China launched the first BDS satellite in 2000. In December 2012, it began providing positioning, navigation, timing and short message services to civilian users in China and parts of the Asia-Pacific.
The system has been gradually introduced into transportation, weather forecasts, marine fishing, forestry and telecommunications.
The new satellite was developed by the Shanghai Engineering Center for Microsatellites, a non-profit organization established by the Chinese Academy of Sciences and the Shanghai Municipal Government.
-Xinhua
The Beidou network will consist of 35 satellites when complete in 2020. The satellites will be scattered in three types of orbits — geosynchronous orbit over the equator and in inclined orbits circling 22,300 miles and 13,300 miles above Earth.
The flight path taken by the Long March rocket indicates the satellite was destined for one of the Beidou system’s inclined orbits.
Xinhua reported a new Chinese upper stage accompanied the Long March 3C rocket launched Monday to inject the Beidou spacecraft into a near-circular orbit close its final operating position, eliminating the need for the satellite to complete the maneuvers itself.
Equipped with a long-life battery, the Yuanzheng stage can fire its engine multiple times during flights lasting up to six hours.
Monday’s launch marked the first spacecraft put in orbit for the third phase of the deployment of China’s Beidou network, which has provided regional navigation coverage over the Asia-Pacific since the end of 2012.
-Spaceflightnow
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