High-resolution technique for time-frequency signal analysis using modified wigner-ville analysis

摘要

An apparatus and method of improving the resolution of a linear FM signal s(t)=a(t)cos phi (t) where phi (t)=2 pi (sot+ alpha t2) is provided by a modified computation of the Wigner-Ville Distribution. An analytical signal <IMAGE> is translated or calculated from the received linear FM signal r(t) so that a Wigner-Ville Kernel sequence <IMAGE> is formulated. An analysis of the frequency of the kernel sequence follows in accordance with a high resolution estimation technique that may include a kind of a least squares approximation fit or an eigenvector spectral estimator such as MUSIC OR ESPRIT to provide an improved time/frequency representation having a resolution of about an order of magnitude better as compared to a conventional discrete Fourier transform frequency analyze of the kernel sequence.