China's Space Program News Thread

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The new generation launch vehicles in China:
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The Development of LOX/LH2 Engine in China:
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Development Status of the Cryogenic Oxygen/Hydrogen YF-77 Engine for LM-5:
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LM-5 integration tests..
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China's new-generation Beidou navigation satellite completed an in-orbit test recently, and will provide navigation and positioning service in the next step.

The new-generation satellite was sent to orbit on Sept. 30 in the southwestern province of Sichuan. It was the 20th satellite for the Beidou Navigation Satellite System (BDS), and puts China one step closer to providing an alternative to the U.S.-operated GPS.

"We mainly judge and analyze the states of the satellites, like whether they're stable in the sky and check their time. These are major tasks of satellite checking. As of today, we have launched 20 satellites. All of them on orbit provide the good navigation signal service. They operate very well," said Xie Jun, chief engineer of the Beidou project.

By applying the more stable rubydium atomic clock and hydrogen clock, the new satellite's navigation precision has been improved by over 100 percent. Through a special design of inter-satellite link, data can be transmitted between satellites, which helps ensure the data's integrity and improve the precision of navigation.

What's more, data transmission speed of the new satellite has been improved by over 20 times than that of the former satellites. In the past, it took two days to transmit the satellite data to the ground center. Now data can be sent back in real time.

"Seen from the experimental results, the high-speed transmission works well. The advantage of high-speed transmission lies in the timely transmission of abundant data from the satellite. The original low-speed one may delay the data transmission," said Xie.

"All the satellites in orbit can ensure to provide the 24-hour service in a stable manner to our country as well as the Asia-Pacific region," Xie added.
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