Synthetic Aperture Radar (SAR), as a kind of active remote sensor, is a system that can scan and image earth surface object in a high resolution using its EM wave.
合成孔径雷达（SAR）作为主动式遥感器，是一种利用雷达本身发射的电磁波进行高分辨率成像的系统。
Spaceborne radar altimeter is an important active microwave remote sensor which is able to measure the oceans with high accuracy.
星载雷达高度计是一种重要的对海洋进行精确测量的主动式微波遥感器。
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