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布里渊光时域反射测量(BOTDR)系统空间分辨率和传感距离存在相互制约的关系。相关序列脉冲编码技术可用于解决这一矛盾,但直接对编码脉冲的布里渊散射采样信号进行解码,会因采样时间间隔小于编码单位脉冲宽度而导致解码信号的失真,从而降低了系统空间分辨率和测量精度。分析了直接互相关解码对BOTDR系统空间分辨率的影响,提出一种基于重采样的互相关解码方法,该方法解决了直接相关运算造成的系统性能降低问题。实验中用512bit 20ns的互补序列在20km光纤末端获得2m的空间分辨率。实验结果表明,与直接互相关的解码方法相比,基于重采样的互相关方法是一种有效的序列脉冲BOTDR信号解码方法。
The relationship between the spatial resolution of the BOTDR system and the sensing distance has a mutual restraint. The related sequence pulse coding technique can be used to solve this contradiction. However, decoding the Brillouin scattering sampled signal directly can reduce the distortion of the decoded signal due to the sampling interval less than the pulse width of the coding unit, thus reducing the spatial resolution of the system Rate and measurement accuracy. The influence of direct cross-correlation decoding on the spatial resolution of BOTDR system is analyzed. A cross-correlation decoding method based on resampling is proposed, which solves the problem of system performance reduction caused by direct correlation operation. In the experiment, a complementary sequence of 512bit 20ns was used to obtain the spatial resolution of 2m at the end of 20km fiber. Experimental results show that, compared with the direct cross-correlation decoding method, the cross-correlation method based on resampling is an effective method for decoding BOTDR signals.