XICHANG: China successfully sent two satellites of the BeiDou Navigation Satellite System (BDS) into space from the Xichang Satellite Launch Center in Sichuan Province at 5:10 a.m. on Monday. Launched on a Long March-3B carrier rocket, the two satellites entered orbit. The new satellites and the carrier rocket were developed by the China Academy of Space Technology (CAST) and the China Academy of Launch Vehicle Technology, under the China Aerospace Science and Technology Corporation. After in-orbit tests, the new satellites will work with BDS satellites already in orbit to improve the positioning accuracy of the system. The two satellites are medium earth orbit (MEO) satellites. Compared with previously launched MEO satellites, these two are equipped with lightweight hydrogen maser clocks, which will serve as a more stable precision frequency reference to make the satellite navigation system work more accurately.