At 4:50 a.m. Beijing time, on April 30, 2012, China launched two BeiDou Navigation satellites from the Xichang Satellite Launch Center using the “Long March IIIB” carrier rocket. This is the first time that China has launched two Satellites using one rocket. These two satellites are the 12th and 13th satellites since the BeiDou Navigation System launched its service on December 27, 2011.
China will launch three more satellites this year and plans to have 30 satellites in orbit by 2020 so that it will provide global coverage of high resolution and reliable positioning, navigation, and timing services.
This was the 160th flight for the Long March series of carrier rockets.
Source: China News Review, May 1, 2012
http://www.chinanews.com/gn/2012/05-01/3857191.shtml