The Long March-3B rocket carrying two satellites blasts off from the launch pad at the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, on April 30, 2012. China successfully launched two satellites into space Monday morning, the 12th and 13th of its indigenous global navigation and positioning network known as Beidou, or Compass system, the launch center said. (Xinhua/Tao Ming)

The Long March-3B rocket carrying two satellites blasts off from the launch pad at the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, on April 30, 2012. China successfully launched two satellites into space Monday morning, the 12th and 13th of its indigenous global navigation and positioning network known as Beidou, or Compass system, the launch center said. (Xinhua/Tao Ming)

The Long March-3B rocket carrying two satellites blasts off from the launch pad at the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, on April 30, 2012. China successfully launched two satellites into space Monday morning, the 12th and 13th of its indigenous global navigation and positioning network known as Beidou, or Compass system, the launch center said. (Xinhua/Tao Ming)

Technicians work at the control center of the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, on April 30, 2012. China Monday morning successfully launched two satellites from the Xichang Satellite Launch Center into space with a Long March-3B carrier rocket, the 12th and 13th of its indigenous global navigation and positioning network known as Beidou, or Compass system, the launch center said. (Xinhua/Tao Ming)

The Long March-3B rocket carrying two satellites blasts off from the launch pad at the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, on April 30, 2012. China successfully launched two satellites into space Monday morning, the 12th and 13th of its indigenous global navigation and positioning network known as Beidou, or Compass system, the launch center said. (Xinhua/Tao Ming)