Chinese Journal of Lasers, Volume. 47, Issue 1, 0104002(2020)
Real-Time Phase-Sensitive Optical Time-Domain Reflectometry Signal Processing System Based on Heterogeneous Accelerated Computing
A real-time phase-sensitive optical time-domain reflectometry (Φ-OTDR) signal processing system is proposed based on the heterogeneous accelerated computing technology of field programmable gate array (FPGA) with respect to the characteristics of complexity, large-amount computation, and high real-time requirements of the Φ-OTDR signal processing system. Firstly, the heterodyne-detection-type Φ-OTDR signal processing flow is analyzed and decomposed. Subsequently, a series of accelerated computing methods based on FPGA, such as sliding window data frame segmentation, multichannel parallel fast Fourier transform calculation, frequency-domain filtering, and short-term energy summation, are proposed. Finally, the system implements long and real-time disturbance signal demodulation and display using a fiber sensing distance of 40 km, a repetition rate of 2 kHz, and a sampling interval of 1 m with a frame overlap of 80%. The FPGA system acts as a heterogeneous accelerator to mitigate the computer data processing pressure and ensure real-time operation of the sensing system at a high repetition frequency, effectively ensuring the system reliability and stability.
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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
Category: measurement and metrology
Received: Jun. 25, 2019
Accepted: Aug. 22, 2019
Published Online: Jan. 9, 2020
The Author Email: Lu Bin (lubin@siom.ac.cn), Li Zhu (lz1126@hdu.edu.cn)