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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该设备能在单一系统同时探测、监控和记录视频基带、无线电通信、卫星通信以及雷达信号。

It enables a combination of video baseband, radio communicatons, satellite communications, and radar signals to be detected, monitored, and recorded simultaneously on a single system.

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这颗卫星上装有无线电收发设备和电源，可对信号接收、处理、放大后再发射，从而大大提高了通信质量。

Telstar is launched as the first "active" communications satellite—active as in amplifying and retransmitting incoming signals, rather than passively bouncing them back to Earth.

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