Honda's Collision Mitigation Brake System (CMS), for example, uses a forward-looking millimetre-wave radar to scan the road ahead.

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As its name suggests, it works by broadcasting a radar wave into the ground and interpreting (as any radar does) what is reflected back.

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The radar sends radio wave pulses into the ice sheet, and the waves bounce off buried features, informing researchers about the characteristics of the snow and ice layers.

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