ESTIMATING THE TIME-DELAY AND FREQUENCY DECAY PARAMETER OF SCATTERINGCOMPONENTS USING A MODIFIED MUSIC ALGORITHM

A superresolution technique to determine the time-delay and frequency response of individual components of electromagnetic scattering is pre sented. A modification of the MUltiple SIgnal Classification (MUSIC) a lgorithm is proposed for the data model which includes scattering comp onents with frequency dependent amplitudes. The modified technique is based on pre-multiplying the scattering data by the inverse of an assu med frequency dependence parameterized by a variable alpha. Estimates of a are then obtained by considering the roots of the root-MUSIC poly nomial for various alpha. The algorithm is tested for simulated and ex perimental compact range data. For the example of measured scattering from a diagonal flat plate, different decay parameters corresponding t o the single and double diffraction components are determined using th e new algorithm.