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众所周知,自适应线谱增强器(ALE)可以在噪声背景中有效地检测未知频率的窄带信号或CW脉冲信号。然而,利用LMS迭代算法的自适应线谱增强器,由于迭代噪声和权噪声的影响,系统的处理增益不够理想。本文提出了ALE的相干累加算法,证明了该算法的自适应滤波器具有ARMA结构。实验表明,改进的ALE较传统的ALE的处理增益高出约14dB。
It is well-known that adaptive line spectrum enhancer (ALE) can effectively detect narrowband or CW pulse signals of unknown frequencies in a noisy background. However, the adaptive line spectrum enhancer using LMS iterative algorithm has poor processing gain due to iterative noise and weighted noise. In this paper, the coherent accumulation algorithm of ALE is proposed, and the adaptive filter of this algorithm is proved to have ARMA structure. Experiments show that the improved ALE processing gain than the traditional ALE about 14dB higher.