An application of the wavelet transform for the echo signal from a rotating object

The backscattering field from a rotating-moving object is a complex-modulated signal, where the overall scattered field from the object changes over time in both amplitude and phase. Consequently, the Doppler spectrum consists of a central Doppler spectral line caused by the motion and many additional Doppler shift spectral lines caused by the rotation of the object. This paper presents an application of wavelet analysis for the echo signal from a spinning rotor in the time-scale domain. A comparison was also made of the measured-data with the simulated-signal for two rotor speeds through the scalograms of the wavelet transform.