水下回波模拟器频率补偿技术

水下回波模拟器可根据目标的声学特性对目标进行回波模拟,广泛用于验证试验、声诱饵等方面。但由于换能器制造工艺等限制,其发射换能器的发送电压响应在不同频率上变化较大。若忽视这个因素,则有时无法做到有效模拟宽频带的目标回波特性。本文通过分段快速Fourier正反变换和频率能量补偿技术实现回声转发信号的发射声源级差异补偿,采用首尾重叠消去法确保变换后数据无畸变。通过NI公司的PCI-6120板卡和工控机完成工程实践工作,并通过水池实验和海试进行可行性验证。

Equalize technique of underwater echo simulator research and achieve

Base on the acoustic characteristics of underwater target,underwater target echo was simulated.It was used in a lot of purposes,for example,validates experimentation,echo bait,and so on. But so the reason of transducer making techniques that it transmitting voltage response is changing more different.If this factor was ignored,target echo characteristics can’t be simulated effectively.An equalizing measurement was researched in this article.Fourier transform,frequency equalize method and a method that insure the data without aberration were used.That realize the echo transmit signals equalization of source level.This technology was actualized in PCI-6120 of NI Company and computer,and it passed experiments in the pool and on the sea.That proved this technology was feasibility.