BIAS COMPENSATION AND TRACKING WITH MONOPULSE RADARS IN THE PRESENCE OF MULTI PATH

The problem of tracking targets in the presence of reflections from se a or ground is addressed. Both types of reflections (specular and diff use) are considered, Specular reflection causes large peak errors foll owed by an approximately constant bias in the monopulse ratio, while d iffuse reflection has random variations which on the average generate a bias in the monopulse ratio, Expressions for the average error (bias ) in the monopulse ratio due to specular and diffuse reflections and t he corresponding variance in the presence of noise in the radar channe ls are derived, A maximum maneuver-based biter and a multiple model es timator are used for tracking, Simulation results for five scenarios, typical of sea skimmers, with Swerling III fluctuating radar cross sec tions (RCSs) indicate the significance and efficiency of the technique developed in this paper-a 65% reduction of the rms error in the targe t height estimate.