分析了相干探测型布里渊光时域反射计(BOTDR)的信号特征及信号包络对其空间分辨率和布里渊频移测量精度等参数的影响,总结了幅度调制信号的数字包络解调算法模型和理想的数字包络解调算法的特性。根据广义谐波小波(GHW)的零相移理想带通滤波特性及通带参数可灵活设计的特点,提出了一种基于广义谐波小波变换(GHWT)的BOTDR的数字包络解调技术,设计了解调方案并进行了参数优化和实验研究。结果表明,与现有BOTDR数字包络解调技术相比,所提出的新技术能够无失真地提取BOTDR的信号包络并具有较强的噪声抑制能力,从而在不影响BOTDR的空间分辨率的情况下提高布里渊频移测量精度。最后,还根据解调算法的频域特性对实验结果进行了分析。 The influence of the signal characteristics of the coherent detection Brillouin optical time domain reflectometer (BOTDR) and the parameters of the signal envelope on the spatial resolution and the measurement accuracy of the Brillouin frequency shift are analyzed. The digital envelope solution of the amplitude modulated signal is summarized Tuning algorithm model and the characteristics of the ideal digital envelope demodulation algorithm. According to the characteristics of zero-phase-shift ideal band-pass filtering of generalized harmonic wavelet (GHW) and the flexible design of passband parameters, a digital envelope demodulation technique based on generalized harmonic wavelet transform (GHWT) The demodulation scheme is designed and the parameters are optimized and experimentally studied. The results show that compared with the existing BOTDR digital envelope demodulation technology, the proposed new technique can extract the signal envelope of BOTDR without distortion and has strong noise suppression capability. Therefore, without affecting the spatial resolution of BOTDR Improve Brillouin frequency shift measurement accuracy. Finally, the experimental results are also analyzed according to the frequency domain characteristics of the demodulation algorithm.