XICHANG加拿大pc28官网规则, Sept. 19 (Xinhua) -- China on Thursday launched two new satellites for the BeiDou-3 Navigation Satellite System (BDS-3) from the Xichang Satellite Launch Center in southwest China's Sichuan Province.
The two satellites, the 59th and 60th satellites of the BeiDou family, were launched at 9:14 a.m. (Beijing Time) by a Long March-3B carrier rocket and the Yuanzheng-1 (Expedition-1) upper stage attached to the carrier rocket.
They are the second group of medium Earth orbit (MEO) satellites launched since BDS-3 was formally commissioned to provide satellite navigation services worldwide. After entering orbit and completing in-orbit tests, they will be connected to the BDS system.
Compared with the previous group of MEO satellites, these new satellites feature upgraded onboard atomic clocks and new inter-satellite link terminals.
They will further improve the reliability of the BDS-3 system and the performance of its positioning, navigation and timing (PNT), global short message communications and other services.
丘吉尔一直被认为是抵抗法西斯的三大巨头之一，他在二战中发挥了巨大的作用，才让风雨飘摇的英国在二战中没有像法国一样亡国，而且在二战期间的几乎所有的反法西斯同盟重大会议也都是由丘吉尔主导的，可以说，他为二战、为英国战时的稳定作出了重要的贡献，然而，胜利即将来临，他却在英国民主竞选当中下野了。
城市防御范围内设有警戒线，约距离城市5公里，其目的是提前预警敌军的行踪。在距离城市15公里以内的区域，则实行坚壁清野政策，将所有人员和可能被敌人利用的物资转移到城内。有时甚至会将无法携带的物资焚毁，并在井中投放毒物。
The satellites will also be used for new technology tests for the next generation BDS system, according to the China Satellite Navigation Office.
China will accelerate the construction and development of the next-generation BDS system, and increase technical research on a variety of PNT methods that do not rely on satellites, said the office.
The satellites and launch vehicles were respectively developed by the Innovation Academy for Microsatellites under the Chinese Academy of Sciences and the China Academy of Launch Vehicle Technology under the China Aerospace Science and Technology Corporation.
This launch was the 535th mission involving Long March series carrier rockets. ■加拿大pc28官网规则
