the correlation structure model of pressure fluctuations in a gas - solid fluidized bed is established. The self- similar parameter H and the intensity parameter σw of Gaussian white noise in the model are determined by the help with wavelet transform. Consequently
it is proved that the pressure fluctuations can be decomposed into the addition of Fractal Brownian Motion (FBM) and Gaussian White Noise (GWN)
and the content proportion of the GWN in the signal is figured out. Finally
the changes of H and σw in different operating conditions are studied and physical interpretation is given.