Accession Number : ADA319302

Title :   Modeling Camouflage Screens Using Xpatch,

Corporate Author : ARMY COMMUNICATIONS-ELECTRONICS COMMAND FORT BELVOIR VA

Personal Author(s) : Jacobs, E. L.

PDF Url : ADA319302

Report Date : 1994

Pagination or Media Count : 7

Abstract : The radar performance of a camouflage screen is dependent upon five parameters; deployment, context, material reflectivity, reflectivity pattern, and surface roughness. A geometric model of draped camouflage screens has been produced which allows arbitrary variation of these three parameters. The model uses a spring connected point mass description of the net. Draping is accomplished via a constrained minimization of the total energy in the structure using a modification of the simulated annealing technique. Constraints include corners staked to a flat ground and support poles. This geometric model was converted to a facet representation and used with the Xpatch electromagnetic prediction code to produce synthetic aperture radar (SAR) images of a screen over a simple target in a statistically homogeneous background. The material in the screen was modeled as a resistive sheet. Arbitrary reflectivity patterns with N resistivities were achieved through the use of an N state Markov process. Roughness was achieved by perturbing the vertices of the facets in the geometric model. Qualitative comparisons of Xpatch SAR imagery and real SAR imagery indicate that all major scattering and attenuation effects of camouflage screens are accounted for by this approach.

Descriptors :   *CAMOUFLAGE, *SCREENS(WOVEN MATERIALS), SIMULATION, GROUND LEVEL, SCATTERING, ANNEALING, PREDICTIONS, PERFORMANCE(ENGINEERING), PARAMETERS, SURFACE ROUGHNESS, RADAR, SYNTHETIC APERTURE RADAR, TARGETS, CODING, GEOMETRIC FORMS, PROTECTIVE EQUIPMENT, PATTERNS, BACKGROUND, ATTENUATION, ELECTRICAL RESISTANCE, REFLECTIVITY, ROUGHNESS, ELECTROMAGNETISM, MARKOV PROCESSES, HOMOGENEITY, POLES(SUPPORTS).

Subject Categories : Optical Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE