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.

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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.

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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.

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