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.
在过去两年Glory观测卫星失败发射，所以无法提供备用的地球观测卫星，这进一步加重了该问题。
The problem is exacerbated by the lack of an adequate replacement for a pair of Earth-observation satellites, the Orbiting Carbon Observatory and Glory, which failed on launch in the past two years.
他们说，他们打算自己发射一颗卫星，另外一颗留着备用。
They say they intend to launch one satellite themselves and to hold the other one in reserve.
他们说，他们打算自己发射一颗卫星，另外一颗留着备用。
They say they intend to launch one satellite themselves and to hold the other one in reserve.
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