电子学报 ›› 2022, Vol. 50 ›› Issue (3): 557-566.DOI: 10.12263/DZXB.20201131
刘胜, 王帮民, 张兰勇
收稿日期:
2020-10-13
修回日期:
2021-12-26
出版日期:
2022-03-25
作者简介:
LIU Sheng, WANG Bang-min, ZHANG Lan-yong
Received:
2020-10-13
Revised:
2021-12-26
Online:
2022-03-25
Published:
2022-03-25
摘要:
针对船舶系统在复杂电磁环境下设备电磁辐射的多通道欠定盲源分离问题,提出了一种基于小波分解(Wavelet Decomposition, WD)、相关性筛选以及独立成分分析(Independent Component Analysis,ICA)的多通道盲电磁辐射现场同步分离方法(Wavelet Independent Component Analysis,WICA).该方法采用小波分解,构造出虚拟通道,然后通过相关性筛选有效分量,最终利用ICA得到设备电磁辐射源信号.此方法不仅解决了欠定盲源分离问题,而且通过相关性筛选提高了ICA的有效性.本文以互相关系数(Cross Correlation Coefficient, CRC)和相干性(coherence)作为实船试验数据的度量指标,通过与(Ensemble Empirical Mode Decomposition-Independent Component Analysis, EEMD-ICA)算法和常规ICA算法的比较,验证了WICA算法在实际应用中的有效性.此方法可推广至航天、国防领域等系统级平台复杂电磁环境的现场测试,具有较高的实用价值.
中图分类号:
刘胜, 王帮民, 张兰勇. 多通道盲电磁辐射现场分离方法研究[J]. 电子学报, 2022, 50(3): 557-566.
Sheng LIU, Bang-min WANG, Lan-yong ZHANG . Research on Multi-Channel Blind Electromagnetic Radiation Field Separation Method[J]. Acta Electronica Sinica, 2022, 50(3): 557-566.
Ch0提取分量及相关系数 | Ch1提取分量及相关系数 | Ch2提取分量及相关系数 | |
---|---|---|---|
EEMD-ICA | [IMF1,IMF2],[ 0.761, 0.497] | [IMF1,IMF2],[ 0.757, 0.503] | [IMF1,IMF2],[ 0.753, 0.506] |
WICA | [D1,D2],[ 0.499, 0.705] | [D1,D2],[ 0.489, 0.719] | [D1],[ 0.713] |
表1 EEMD?ICA与WICA采用基于相关性的筛选算法比较
Ch0提取分量及相关系数 | Ch1提取分量及相关系数 | Ch2提取分量及相关系数 | |
---|---|---|---|
EEMD-ICA | [IMF1,IMF2],[ 0.761, 0.497] | [IMF1,IMF2],[ 0.757, 0.503] | [IMF1,IMF2],[ 0.753, 0.506] |
WICA | [D1,D2],[ 0.499, 0.705] | [D1,D2],[ 0.489, 0.719] | [D1],[ 0.713] |
参数列表 | 分解层数 | CRC | Wall time | ||
---|---|---|---|---|---|
EEMD/WICA | ICA | ||||
EEMD-ICA | trials=100 noise width=0.05 | [8,7,7] | [0.62,0.45,0.63,0.67] | 1min 46s | |
WICA | ‘db1’ 分解层数:5 算法‘visushrink’ 阈值函数:‘less’ | [6,6,6] | [0.77,0.47,0.74,0.77] | 46ms |
表2 EEMD?ICA/WICA算法参数与指标对比
参数列表 | 分解层数 | CRC | Wall time | ||
---|---|---|---|---|---|
EEMD/WICA | ICA | ||||
EEMD-ICA | trials=100 noise width=0.05 | [8,7,7] | [0.62,0.45,0.63,0.67] | 1min 46s | |
WICA | ‘db1’ 分解层数:5 算法‘visushrink’ 阈值函数:‘less’ | [6,6,6] | [0.77,0.47,0.74,0.77] | 46ms |
竞争 算法 | 算法参数配置 |
---|---|
FastICA | approach=‘defl’,g=‘pow3’,mu=1,max_it=5000,limit=0.001 |
JADE | limit=0.001,max_it=1000 |
CuBICA | limit=0.001 |
TDSEP | lags=1, limit=1e-05, max_iter=10000 |
表3 对比算法参数配置
竞争 算法 | 算法参数配置 |
---|---|
FastICA | approach=‘defl’,g=‘pow3’,mu=1,max_it=5000,limit=0.001 |
JADE | limit=0.001,max_it=1000 |
CuBICA | limit=0.001 |
TDSEP | lags=1, limit=1e-05, max_iter=10000 |
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