他们在橡皮船上安装了雷达发射器、接收器和天线，在浮动冰架间运行的过程中接收有价值的数据。
They fit a radar transmitter, receiver and antennas to the kayaks, to obtain valuable data on the processes operating over floating ice shelves.
通过任务前的规划，我们可以知道要躲开些什么东西，设置什么接收器，在什么样的高度雷达会起作用。
We go through pre-mission planning, and if we're trying to evade something, you can put up receivers, and you understand at what altitude that radar is going to be effective.
并且这还只是整个进程的一半：一旦电波碰到目标物体反射，它们必须再次穿过墙壁返回雷达的接收器。
And that’s only half the battle: Once the waves bounce off any targets, they must pass back through the wall to reach the radar’s receivers — and again, 99 percent don’t make it.
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