Maintaining the output character of the system, the voltage space vector control was improved which made the switching frequency decrease 50%.

对空间电压矢量方法进行了改进，在不改变系统输出特性的前提下，使开关频率降低了50%。

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Underwater acoustic channel is a time-space-frequency variant channel, having a character for narrow bandwidth, high ambient noise level and strong interference of multipath.

而由此构成的水声信道是一个空间与频率响应随机快速变化的传输信道，存在窄带、高噪及强多途干扰。

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