铱公司还说,它期望在30天之内用八颗在轨备用卫星中的一颗来替代失去的卫星。
Iridium also said it expected to replace the lost satellite with one of its eight in-orbit spares within 30 days.
当汽车在开行当中时,跟踪设备用三个或四个GPS卫星以三角形定位,然后持续地通过无线电数字传输目标所在的坐标位置。
As the target drives around, the tracking device triangulates its position from three or four GPS satellites, and digitally transmits its coordinates continuously by radio.
它的星座由66个低地球轨道交联卫星组成,并有多个卫星在轨备用。
Its constellation consists of 66 low earth-orbiting, cross-linked satellites and has multiple in-orbit spares.
应用推荐