高一致性低噪声多路水声信号预处理设计方法

随着水下探测技术的发展,对于多路微弱水声信号预处理的指标要求越来越高。由于运算放大器和RC网络组成的高阶数带通滤波器,需要大量的外接电阻和电容,在较多通道数量的应用条件下,通道间的信号幅度和相位一致性很难控制。提出了一种新的高一致性低噪声多通道信号预处理方法。经过实验分析,在等效输入噪声、幅频特性、相频特性等方面效果很好,能够达到要求的技术指标。该方法能够在高一致性低噪声的多通路水声信号预处理中得到广泛的应用。

A Design Method of High Consistency Low Noise Multi-channel Underwater Acoustic Signal Pretreatment

With the development of underwater detection technology, in the underwater acoustic communication field, the requirements of the multi - channel underwater acoustic signal pretreatment increase quickly. At the same time, when using the operational amplifiers and the RC network consisting of high order bandpass filter, the needs of many external resistances and capacitances make the consistency of signal amplitude and phase difficult to control under the application conditions of many channels. A new kind of high consistency low noise multi - channel signal pretreatment method is presented in this pa- per. According to the experiment analysis, this method performs excellent with the equivalent input noise, the amplitude - frequency characteristics and the phase -frequency characteristics. So this method can be widely applied with the high con- sistency low noise multi -channel underwater acoustic signal pretreatment .