当井口偏移距较小时，直线法和折线法求取的层速度和地层真速度吻合；
When the offset distance is smaller on the wellhead, the layer velocity obtained with straight line and the refraction line is matched with that of actual formation velocity.
简化仿真模型将双向开关视为理想开关，仿真速度较快，用来验证控制算法的合理性；
The simplified simulation model would have considered bi-directional switches as ideal ones, and its simulated speed was faster, by which the reasonability of control algorithm has been verified;
根据以上算法求得的相速度更接近瑞利波真速度，从而提高了相速度的分辨率和精确度。
Based on the algorithm, the value of transient Reyleigh wave phase velocity is closer to true wave velocity, so the resolving rate and the definition of the phase velocity are improved.
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