Advanced IF Estimation-Based TF Filter Suitable for Estimation of Non-Linear Highly Nonstationary FM Signals: Principles of Functioning and Designing

Time-frequency (TF) filters based on estimation of the instantaneous frequency (IF) of the analyzed signal and on the correspondence of the estimated IF with the filter's region of support provide an efficient filtering of FM signals with linear frequency changes. However, these solutions distort FM signals having non-linear frequency changes. Advanced IF estimation-based TF filter is developed to be suitable for the non-linear highly nonstationary FM signals. This advanced solution, as well as principles of its functioning and designing are considered here.