Noise reduction method and device for distributed optical fiber temperature measurement system

The invention provides a noise reduction method for a distributed optical fiber temperature measurement system, comprising the following steps: collecting Stokes light and Anti-Stokes light in an optical fiber temperature measurement system; converting the Stokes light and the Anti-Stokes light into corresponding voltages; preprocessing data of the voltages obtained from conversion; carrying out lifting wavelet transformation on the preprocessed data to get wavelet coefficients at different scales; building a hidden Markov tree model for the high-frequency wavelet coefficients at each scale; training the hidden Markov tree model, and calculating the various parameters in the model; carrying out Bayesian estimation on the high-frequency wavelet coefficients of noisy signals according to the hidden Markov tree model to get the high-frequency wavelet coefficients of a group of real signals; carrying out lifting wavelet inverse transformation according to the estimated high-frequency wavelet coefficients and the