作者：邱傅杰, 陈婉如, 李金龙, 马士平

作者单位：上海市计量测试技术研究院基础性能试验中心，上海 200233

关键词：电磁干扰;盲源分离;接收机;频谱仿真

摘要：

为实现多分量混合电磁干扰(electromagnetic interference，EMI)信号中的信息挖掘，提出一种基于单通道盲源分离和频谱仿真的分析方法。首先，采用奇异谱分析(singular spectrum analysis，SSA)结合独立分量分析(independent component analysis，ICA)对混合信号进行单通道盲源分离。其次，对分离所得波形采用短时傅里叶变换(short time Fourier transform，STFT)来构建仿真EMI频谱。最终，将仿真频谱与混合信号的接收机实测频谱进行对比研究。实验结果表明：分离信号的波形畸变较小，仿真频谱与实测频谱在基波和低次谐波处较为吻合。通过提高ICA中的特征维度，可以进一步提升仿真频谱的质量，但会导致算法收敛困难。该方法能有效分解混合EMI信号并解释其对应频谱。

Blind source separation and spectrum simulation in conducted disturbance measurement
QIU Fujie, CHEN Wanru, LI Jinlong, MA Shiping
Fundamental Performance Test Centre, Shanghai Institute of Measurement and Testing Technology, Shanghai 200233, China
Abstract: In order to realize information mining from the multicomponent mixed electromagnetic interference (EMI) signal, an analysis method based on single-channel blind source separation and spectrum simulation is provided. First, a combination of singular spectrum analysis (SSA) method and independent component analysis (ICA) method is used to achieve the single-channel blind source separation on the mixed signal. Second, the short time Fourier transform (STFT) is used to construct simulated EMI spectrums from waveforms of separated signals. Finally, a comparative study is performed between simulated spectrums and the receiver measured one of mixed signal. Experiment results show that distortion of separated signals is small, and simulated spectrums fit with the measured one well in fundamental and low order harmonic frequencies. The quality of simulated spectrums can be further improved by increasing the feature dimensions in ICA, while the convergence difficulty in calculation is accompanied by it. This method can effectively decompose the single-channel EMI signal and explain its spectrum.
Keywords: electromagnetic interference;blind source separation;receiver;spectrum simulation
2023, 49(4):13-20  收稿日期: 2021-06-29;收到修改稿日期: 2021-09-15
基金项目: 上海市科技重大专项(2017SHZDZX01)；上海市基础性能试验专业技术服务平台(20DZ2290400)
作者简介: 邱傅杰(1989-),男,江苏启东市人,助理工程师,硕士,主要研究方向为电磁兼容领域的智能测量
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