
46 ◾ Jingang Zhong and Jiawen Weng
stationary signal, the global fundamental spectral component can
be reconstructed as Equation (2.13). Applying the inverse FT to the
fundamental spectral component, the phase φ(x) can be obtained by
Equations (2.4) and (2.5).
2.4.2 Principle of the Determination of the Scale Factor for AWFT
e adaptive window size is determined by the length of the local station-
ary signal, which is dened as the local signal whose fundamental spectral
component is separated from all the other spectral components within
the corresponding spatial area. e instantaneous frequency of the local
signal is introduced to determi ...