Sinusoidal frequency modulation fourier transform and micro-Doppler spectrum estimation of vibrating vehicles

Vibration signature extraction and vehicle type identification are traditional aspirations in micro-Doppler domain. Radar echoes from vibrating targets can be modeled as frequency-modulated signals, with micro stochastic Doppler components in phase item. In this work, the sinusoidal frequency modulation Fourier transform (SFMFT) in sinusoidal frequency modulated signal space is proposed, which owns significant advantages in analyzing faint and complicate phase modulation signals. SFMFT provides a straightforward and effective approach to analyze the arbitrary frequency modulation signals. This method improves the estimate precision and reduces the requirement of radar working frequency band. Simulations of vibration spectrum extraction indicate the effectiveness of the model and method proposed in this work.