Motion compensation is one of the key problems in ISAR imaging. Usually, the compensation process is based on an isolatedpoint on target.
运动补偿是ISAR成像的关键问题之一，通常都是利用目标的一个孤立点作基准进行补偿。
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The conceptions of DL3-similarity degree and pseudo-metric on two formulas are given. DL3-logic metric space is built. And it is proved that this space has no isolatedpoint.
However, in reality, this isolatedpoint can not always be found. A new scheme which can compensate the motion effects for continuous target return is presented in the paper.