Clutter Suppression and Rotor Blade Feature Extraction of a Helicopter Based on Time–Frequency Flash Shifts in a Passive Bistatic Radar

This paper presents a passive bistatic radar (PBR) configuration using global navigation satellite system as an illuminator of opportunity for the rotor blade feature extraction helicopter. Aiming at strong fixed clutter in surveillance channel PBR, novel iteration elimination method-based singular-value decomposition approach is proposed. Instead range method used classic extended cancellation algorithm, proposed distinguishes largest singular value and by remove this value. At same time, fuselage echo hovering helicopter can also be suppressed along with ground clutter, then obtained. In micro-motion extraction, mathematic principle flash generation process time–frequency distribution (TFD) derived first. Next, phase compensation applied to achieve shift TFD. After this, center frequencies standard flashes TFD are compared frequency dictionary. The mean l1 norm utilized estimate parameters rotor. experiments, scattering point model physical optics facet demonstrate that obtain more accurate parameter estimation results than some algorithms.