Highly dispersive scattering centre analysis using an enhanced parametric model

The existing dispersive scattering centre (DSC) models characterise high frequency backscatter of targets for range profile analysis. These models fail to analyse the inherent non-point scatterers such as highly dispersive waveguide geometries with a large number of propagation modes. Here, a parametric model is proposed that represents such misbehaved DSC as a sum of few equivalent point scatterers using an auxiliary correcting dispersion factor that gets around modal analysis. A population-based maximum likelihood algorithm is utilised to estimate the unknown parameters. The high-spatial resolution PRONY method is utilised for initialisation of some parameters. Measurements and method of moment solutions of some canonical and non-canonical dispersive targets are used in the authors´ parameter estimation. Comparisons are made with the inverse fast Fourier transform (IFFT) results.