Parameter estimation of undersampled signals by Wigner-Ville analysis

A method based on computing the Wigner-Ville distribution is proposed for estimating the instantaneous frequency of undersampled signals whose instantaneous bandwidth is considerably smaller than the overall bandwidth. The approach is not parametric, i.e. the instantaneous frequency can be recovered, whatever its time variation law. The limits of applicability of the method depend on the relationship between the instantaneous bandwidth, the overall bandwidth, and the undersampling factor. The method is applicable to the high-resolution radar imaging of moving objects