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美空军在1978年12月14日从东靶场发射了一对TRW公司制造的国防通信卫星系统-Ⅱ(DSCS-Ⅱ)卫星。这对卫星是该系列卫星中的第11和12颗。自从1971年发射第一对DSCS-Ⅱ卫星以来,已进行了六次发射,其中有四次成功地把8颗卫星送入同步轨道,另两次因运载火箭故障导致发射失败,损失了4颗卫星。 DSCS-Ⅱ系统由国防部通信局管理,为国防部用户提供远距离通信业务,以及为军事指挥系统各部门(包括国家指挥机关及移动用户)之间提供通信联系。DSCS-Ⅱ是一种自旋稳定卫星,用大力神-3C发射。这两颗卫星经过在轨道上检测后,一颗将定点于西径135度,另
The U.S. Air Force fired a pair of Defense Communications Satellite System-II (DSCS-II) satellites from TRW on December 14, 1978. The satellites are the eleventh and twelfth of the series of satellites. Since launching the first pair of DSCS-II satellites in 1971, six launches have been carried out, four of which successfully brought orbit eight satellites into orbit and the other two that failed launches due to launch vehicle failures, losing four satellite. The DSCS-II system is managed by the Department of Defense communications bureau to provide long-distance communications services to Department of Defense users and to provide communications between various components of the military command system, including state command and mobile users. DSCS-II is a spin-stable satellite, launched by Hercules-3C. After the two satellites in orbit detection, one will be fixed at the western diameter of 135 degrees, the other