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拖曳式线列阵是近来声呐信号处理领域中非常活跃的课题.自适应线谱增强器有可能用于拖曳式线列阵的信号处理系统.在利用LMS迭代算法的自适应线谱增强器中,由于存在迭代噪声,系统增益与输入信噪比有关.如果不抑制拖曳平台的噪声,线谱增强系统的效用就无法发挥出来,文中提出用自适应噪声抵消系统和自适应线谱增强器级联的概念.首先把拖曳平台的噪声作为干扰加以抑制,再对输出信号进行线谱增强,从而可以提取微弱信号的线谱分量.
Towed line array is a very active subject in the field of sonar signal processing recently.Adaptive line spectrum enhancers may be used in towed line array signal processing systems.In the adaptive line spectrum enhancer using LMS iterative algorithm , Because of the existence of iterative noise, the system gain is related to the input signal-to-noise ratio.If the towed platform’s noise is not suppressed, the effect of line spectrum enhancement system can not be exerted.An adaptive noise cancellation system and adaptive line spectrum enhancer Firstly, the noise of the towing platform is suppressed as interference, and then the line signal of the output signal is enhanced, so that the line spectrum component of the weak signal can be extracted.