【摘要】 提出了基于两级自适应滤波的谱线增强算法,一方面设计了串联两级自适应滤波,更好地达到滤除噪声信号、恢复有用信号,更加准确地检测出信号;另一方面改进了自适应滤波器权系数更新公式,减小自适应时间,提高收敛速度。仿真分析对比两种算法,并针对强噪声背景下的潜艇信号弱的问题,分析了3种检测方法,通过比较信号的功率谱特性,改进的自适应谱线增强算法可以更好地抑制噪声,提高信噪比,有利于潜艇弱信号检测。更多还原

【Abstract】 A spectral line enhancement algorithm based on two-stage adaptive filtering was proposed. On the one hand,the algorithm designed two-stage adaptive filter in series,which could filter out the noise signal and restored the useful signal better,so as to detected the signal more accurately; on the other hand,it improved the update formula of the weight coefficient of the adaptive filter,reduced the adaptive time and improved the convergence speed. The performance of the two algorithms is compared with simulation analysis. Aiming at the problem of weak signal of submarine under strong noise background,three detection methods were simulated and analyzed. By comparing the power spectrum characteristics of the signal,the improved adaptive line enhancement algorithm can better suppress noise,improve signal-tonoise ratio,and is conducive to the detection of weak signal of submarine.更多还原