基于噪声抑制门的两级自适应线谱增强算法

马凯; 蔡昱明; 王易川; 程玉胜

doi:10.11999/JEIT200540

基于噪声抑制门的两级自适应线谱增强算法

doi: 10.11999/JEIT200540

1.
海军潜艇学院青岛 266000
2.
91001部队北京 100036

详细信息

作者简介:
马凯：男，1993年生，博士，研究方向为水声目标识别

蔡昱明：男，1982年生，工程师，研究方向为水声探测

王易川：男，1976年生，副教授，研究方向为水声目标识别

程玉胜：男，1963年生，教授，研究方向为水声目标识别

通讯作者:
马凯　makainue@163.com

中图分类号: TN911.7
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出版历程
- 收稿日期: 2020-07-02
- 修回日期: 2020-10-29
- 网络出版日期: 2020-12-14
- 刊出日期: 2021-03-22

An Algorithm of Two-level Adaptive Line-spectrum Enhancement Based on Noise Suppression Gate

1.
Naval Submarine Academy, Qingdao 266000, China
2.
Unit 91001, Beijing 100036, China

摘要

摘要: 针对低信噪比下，自适应线谱增强(ALE)算法在低信噪比时性能急剧下降的问题，该文提出2级ALE算法，该算法在普通的ALE算法的基础上，将输出信号和误差信号的傅里叶变换作为第2级ALE的输入，对线谱作进一步增强。并利用噪声抑制门对信号进行降噪预处理，然后结合提出的2级ALE算法，提出一种基于噪声抑制门的2级ALE算法，进一步提高信噪比，增强线谱。仿真和海试数据表明，算法性能较普通ALE算法有较大提升。
- 线谱增强 /
- 噪声抑制门 /
- 2级ALE算法
Abstract: In view of the problem that the performance of the Adaptive Line-spectrum Enhancement (ALE) algorithm drops sharply under low signal-to-noise ratio, a two-level ALE algorithm is proposed. Based on the ordinary ALE algorithm, the Fourier transform of the output signal and the error signal is used as the input of the second-level ALE to enhance further the line-spectrum. The noise suppression gate is used to perform noise suppression preprocessing on the signal, and then combining with the proposed two-level ALE algorithm, an algorithm of two-level ALE based on noise suppression gate is proposed to improve further the signal-to-noise ratio and enhance the line-spectrum. Simulation and sea trial data show that the performance of the algorithm is greatly improved compared with the ordinary ALE algorithm.
- Line-spectrum enhancement /
- Noise suppression gate /
- Two-stage Adaptive Line-spectrum Enhancement (ALE) algorithm

HTML全文

图 1 ${R_n}\left( t \right)$

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图 2 ${R_s}\left( t \right)$

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图 3 噪声抑制门示意图

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图 4 2种方法频谱图对比

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图 5 ALE原理框图

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图 6 2级ALE原理框图

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图 7 3种算法的频谱图

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图 8 更低信噪比下3种算法的频谱图

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图 9 3种算法处理后的频谱图对比

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图 10 同一时刻3种算法处理后的频谱图对比

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图 11 基于噪声抑制门的2级ALE算法处理流程

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图 12 3种算法处理后的频谱图对比

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图 13 3种算法处理后的频谱图对比

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图 14 同一时刻3种算法处理后的频谱图对比

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图 15 3种算法处理后的频谱图对比

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表 1 3种算法处理后的线谱信噪比比较(dB)

线谱(Hz) 原始频谱信噪比 1级ALE处理后的信噪比 2级ALE处理后的信噪比

98 5.2 10.2 11.0
124 1.6 4.6 6.0
257 3.8 9.7 10.1

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表 2 3种算法处理后的线谱信噪比比较(dB)

线谱(Hz) 原始频谱信噪比 2级ALE处理后的信噪比基于噪声抑制门的2级ALE处理后的信噪比

98 5.2 11.0 17.9
124 1.6 6.0 16.0
257 3.8 10.1 20.8

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