DEM中的闭合洼地和平坦区域是由于低质量的资料输入、生成DEM时的内插误差等引起的。

It is known that flat areas and closed depressions often arise because of low quality input data, interpolation errors during DEM generation et al.

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此外，本文还提出了另一种幅度内插的方法，很好地解决了速度估计误差造成的距离耦合时移问题。

In addition, an amplitude interpolating method is given to resolve the range coupling shift caused by velocity estimated error.

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采用本文研究的API内插模型，小数分频的尾数调制寄生谱可以抑制到相位内插信号准确地匹配相位误差的程度。

Using the API model mentioned in this paper, the fractional spuriousness are reduced to the extent that the phase interpolation signal exactly matches the phase error.

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