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)