Estimating the time-delay and frequency decay parameter of scattering components using a modified MUSIC algorithm

A superresolution technique to determine the time-delay and frequency response of individual components of electromagnetic scattering is presented. A modification of the MUltiple SIgnal Classification (MUSIC) algorithm is proposed for the data model which includes scattering components with frequency dependent amplitudes. The modified technique is based on pre-multiplying the scattering data by the inverse of an assumed frequency dependence parameterized by a variable α. Estimates of α are then obtained by considering the roots of the root-MUSIC polynomial for various α. The algorithm is tested for simulated and experimental compact range data. For the example of measured scattering from a diagonal flat plate, different decay parameters corresponding to the single and double diffraction components are determined using the new algorithm