Reflectivity Displacement Method (RDM) is a classical algorithm of Synthetic Aperture Radar (SAR) autofocus processing, whose performance degenerates with low contrast of the scene.

反射率偏移法（RDM）是合成孔径雷达（SAR）自聚焦的经典算法，当场景对比度较低时，RDM自聚焦效果变差。

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The features of educational narrative research are natural scene, reflectivity, openness and interpretation of meaning.

自然情境性、反思性、开放性、意义诠释性是教育叙事研究的特点。

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