不同之处是雷达发出的是无线电波，这种波波长较长，反射体只能是大个物体。
The difference is that radar depends on radio waves. These have long wavelengths and therefore bounce only off large things.
飞行器离雷达天线越远，天线电波的波长越宽如此以来使测量出的位置信息误差越大。
The beam of the antenna gets wider as the aircraft get farther from the antenna, thus making the measured position information less accurate.
现有的超宽频雷达为避免干扰，典型的方法是使用一个不规则声波发生器来规避和它波长相同的声波。
Existing UWB radars typically use a random noise signal to avoid interference between waves of the same wavelength.
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