Modelling and simulation of spatial-temporal correlated K distributed clutter for coherent radar seeker

摘要

Modelling the clutter with accurate spatialtemporal correlation, amplitude statistical characteristic and coherence is significant to the evaluation of constant false alarm rate (CFAR) detection performance for coherent radar seeker in clutter. In this study, the authors propose a modelling method for spatialtemporal correlated coherent K distributed clutter. At first, with the assumption that clutter shape parameter is known, the authors estimate the scale parameter of K distributed clutter by calculating the clutter power of the range reference cell of CFAR detection according to the radar seeker operating circumstance. Then, they model the temporal correlated coherent K distributed clutter and spatial correlated coherent K distributed modulation component, respectively, by employing exogenous modelling method. The authors propose to modulate the temporal clutter with spatial modulation sequence to obtain spatialtemporal correlated coherent K distributed clutter for multiple range reference cells of CFAR detection. Finally, they show the validity of the proposed modelling method by simulation.