REPORT DOCUMENTATION PAGE
Form Approved OMB No. 0704-0188Public reporting burden lor this collection ol information is estimated to average 1 hour per response, including the time lor reviewing instructions searching existing data sources, gathenng and maintaining the data needed, and completing and reviewing the collection ol information.
AGENCY USE ONLY (Leave blank)2. REPORT DATE
January 2001
REPORT TYPE AND DATES COVERED
Final ReDort
TITLE AND SUBTITLE
Development of ComDutational Tools for Predicting the Radar Scattering from Targets on a Rough Sea Surface
6, AUTHOR(S)R.J. Burkholder, P. Janpugdee and D. Colak
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)The Ohio State University ElectroScience Laboratory 1320 Kinnear Road Columbus, Ohio 43212
SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office The radar scattering from 2D and 3D targets on a rough sea surface is investigatet using computational techniques developed specifically for this Droblem. Numerical simulations and Monte Carlo studies yield insight into the scat, ohenomenology. It is found that the scattering from a target on a random rough sea surface becomes more coherent as the incident field becomes more coherent, ie, for low wind speeds or low elevation angles. For the less coherent case, the avg. and peak scattering levels of a target on a rough surface may be significantly higher or lower than for a flat surface, depending on the target geometry. A tilted plane model is proposed for predicting the variations in the RCS of a target on a rough sea surface by mounting the target on a locally planar surface which can tilt, similar to the two-scale comDosite model of ocean scattering. It is found that tilting the plane, or equiv., rolling the target on a horiz. plane fields as much or more variation in the RCS than caused by the rough surface. However, the cross polarization introduced by the rough surface in 3D is not well predicted by the tilted plane model, nor is the unexDlained behavior near the Brewster angle for vertical polarization.
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