理论计算可分下列两种情况： （1）对基本船型的水线迭加曲线薄船函数以计算其对应的改良船型。
The theory calculations may be divided the following two cases:(1) Appending curve thin ship functions to the waterlines of basis ship respectively, the corresponding improved ship form is calculated.
因此，实际观测得到的反射波到达时间，并不是标准的双曲线，而是一条畸变了的双曲线，从而影响速度分析和迭加效果的质量。
Therefore, the actual observation obtains the reflection time, is not the standard hyperbolic curve, but was a distortion hyperbolic curve, thus influence speed analysis and iteration effect quality.
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