Qinghua Sheng, Zhao Yu, Bin Lu, Zhu Li, Qing Ye, Zexin Zhang. Real-Time Phase-Sensitive Optical Time-Domain Reflectometry Signal Processing System Based on Heterogeneous Accelerated Computing[J]. Chinese Journal of Lasers, 2020, 47(1): 0104002
- Chinese Journal of Lasers
- Vol. 47, Issue 1, 0104002 (2020)
Fig. 1. Schematic of Φ-OTDR experimental system
Fig. 2. Format of data frame
Fig. 3. Signal processing steps of Φ-OTDR system
Fig. 4. Schematic of FPGA implementation
Fig. 5. Pipeline using in system. (a) Structure of pipeline; (b) timing of FFT pipeline process
Fig. 6. Sliding read and combination of data frame
Fig. 7. Process of FFT calculation
Fig. 8. Process of filtering calculation
Fig. 9. Accuracy of FFT calculation
Fig. 10. Actual calculation results. (a) FPGA FFT;(b) MATLAB FFT
Fig. 11. Transition display of disturbance
Fig. 12. Disturbance andmagnified image of disturbance point
Fig. 13. Frequency spectrum analysis. (a) Frequency spectrum without disturbance point; (b) frequency spectrum with disturbance point
Fig. 14. Results of filtering. (a) Result before filtering; (b) result after filtering
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Table 1. Resource utilization of FPGA
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Table 2. Time differences of calculating FFT between FPGA and Matlab
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Table 3. Real-time test results
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Table 4. Time analysis of secondary pipeline
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