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鉴于布里渊光时域分析(BOTDA)传感系统中空间分辨率和传感距离存在相互制约的关系,提出了一种结合格雷(Golay)编码技术与差分脉冲对(DPP)技术的混合编码方法。该方法结合了Golay编码可提高系统信噪比以及DPP可改善系统空间分辨率的优点,相对于Golay-BOTDA的DPP方法能进一步提高系统信噪比,理论上在相同采样次数下信噪比可提升6dB。实验结果表明,采用改进的混合编码可以在25km光纤末端获得1.6m的空间分辨率。同时,与基于Golay-BOTDA的DPP方法相比,在相同的采样次数下系统信噪比提升了4.08dB。
In view of the mutual restraint relationship between spatial resolution and sensing distance in the BOTDA sensing system, a hybrid encoding method combining Golay encoding with DPP (Differential Pulse Pairing) is proposed method. The method combines Golay coding can improve system signal to noise ratio and DPP can improve the system spatial resolution advantages compared to the Golay-BOTDA DPP method can further improve the system signal to noise ratio, in theory, the same number of samples under the SNR Improve 6dB. The experimental results show that the improved hybrid coding can achieve the spatial resolution of 1.6m at 25km fiber end. At the same time, compared with the DPP method based on Golay-BOTDA, the system SNR increases by 4.08dB at the same sampling frequency.