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Multi-frequency Phase Sensitive Detection with Improved Median Filtering
CUI Zi-Qiang, HAO Zhen-Hua, WANG Hua-Xiang
School of Electrical Engineering and Automation,Tianjin University, Tianjin 300072
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Funding: 教育部新教师基金（No.20120032120088）
Opened online:20 May 2016
Accepted by: none
Citation: CUI Zi-Qiang, HAO Zhen-Hua, WANG Hua-Xiang.Multi-frequency Phase Sensitive Detection with Improved Median Filtering[OL]. [20 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688108
 
 
Multi-frequency signal detection plays an important role in bio-impedance measurement, EM induction based non-destructive test, etc. The Phase-sensitive detection (PSD) is an effective tool for discriminating the amplitude and phase of each frequency component. The phase sensitive demodulator can be viewed as a matched filter to its source signal and is the optimal linear filter when only Gaussian noise is at presence. In many real applications, however, the noise has also rather distinctive impulsive characteristics. The impulsive noise puts forward a great challenge for the multi-frequency PSD. In this paper, an approach for the reduction of impulsive noise is introduced to improve the performance of multi-frequency PSD. The proposed method is able to achieve better signal-to-noise ratio (SNR) than its linear counterparts in processing digital signal that contaminated by impulsive noise.
Keywords:Impulsive noise; phase-sensitive detection; median filter; digital signal processing.
 
 
 

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