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《Acta Optica Sinica》 2017-08
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Pattern Recognition of Heterodyne Phase-Sensitive Optical Time-Domain Reflection Technique Based on Down Conversion and IQ Demodulation

Shen Longxiang;Feng Hao;Sha Zhou;Zeng Zhoumo;State Key Laboratory of Precision Testing Techniques and Instrument,Tianjin University;  
An embedded pattern recognition method for heterodyne phase-sensitive optical time-domain recognition(Φ-OTDR)technique with high signal-to-noise ratio(SNR),high resolution and low cost is proposed based on analog down conversion,digital IQ demodulation and back propagation(BP)neural network.When we use a digital signal processor(DSP),field programmable gate array(FPGA)and a peripheral circuit to replace GHz data acquisition and signal generator,cost and size are reduced.A method based on time and space two-dimensional extracting morphological features is designed,and the BP neural network is used to multi-class recognition.Compared with the traditional mode recognition for one-dimensional signal,the proposed method can achieve lower false alarm rate and higher recognition rate.Experiment results show that designed embedded parallel signal processing architecture based on FPGA+DSP can satisfy the real-time monitoring requirements.SNR of the system is 12.43 dB and the event recognition rate is 97.78%.
【Fund】: 国家自然科学基金青年基金(61304244);; 高等学校博士学科点专项科研基金(20130032130001)
【CateGory Index】: TP391.4
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