传感器部位上的下行波场被正向传播到水底，产生水底处的下行 波场（46）。

The down-going wavefield at the sensor position is forward propagated to the water bottom, resulting in a down-going wavefield at the water bottom (46).

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其次，针对行波型超声电机的正向和反向速度特性不一致的情况，提出一种正、反向速度平衡补偿算法，并用硬件实现了平衡补偿控制器。

Secondly, aiming at losing balance between the CW and CCW rotation speed, a balancing compensation algorithm is put forward, and which is implemented with hardware.

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其次，针对行波型超声电机的正向和反向速度特性不一致的情况，提出一种正、反向速度平衡补偿算法，并用硬件实现了平衡补偿控制器。

Secondly, aiming at losing balance between the CW and CCW rotation speed, a balancing compensation algorithm is put forward, and which is implemented with hardware.

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