Micro-Doppler Frequency Extraction for Cone-skirt Shaped Target with Precession Based on Parameterized Time-frequency Analysis

The micro-Doppler signatures can be utilized to the estimation of the motion and structure parameters of the targets. In this paper, based on the effective point scatterer model of the cone-skirt shaped target, the formulas of micro-Doppler induced by the precession are derived. Since the micro-Doppler curves induced by the precession are in the forms of the multi-stage superimposed sine series for the cone-skirt shaped target, an approach to extract the micro-Doppler frequency based on the parameterized time-frequency analysis is proposed. In this method, the precession frequency is first estimated via the Coherent Single Range Doppler Interferometry (CSRDI) algorithm, then the micro-Doppler curve of each scatterer is estimated based on the parameterized time-frequency analysis, and finally the scatterers' echoes can be separated with the band-stop filter. In the simulation experiments, the proposed method is evaluated based on the electromagnetic computation data.