Stochastic Modelling of EM Scattering from Foliage
Abstract
This project focused on the development and evaluation of analytical methods for the description of scattering and absorption of electromagnetic radiation by dense foliage. The key consideration has been the description of multiple scattering processes in a random medium. Three different techniques for the description of microscopic scattering processes are discussed in this report. The T-matrix approach to multiple scattering represents the field at an individual scattering center in terms of an equivalent field produced by the other scatterers. It supports several natural approximations for this equivalent field which take multiple scattering processes into account at various levels of detail. The Coherent Potential Approximation is developed in detail. The homogenization method is a technique for the derivation of an equivalent representation of the scattering process in terms of an asymptotic analysis of Maxwell's equations in the limit as the separation between the scattering centers approaches zero. Bounds for the effective parameter representations are also discussed. Scattering from foliage covered terrain on a macroscopic scale is treated by using the approximations to develop effective media representations of the foliage. These are used in combination with an analytical methodology based on the method of smoothing perturbation to treat the foliage as an interface region with a very rough boundary. Keywords: Radar scattering; Radar clutter. (JHD)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1989
- Accession Number
- ADA213118
Entities
People
- Gilmore L. Blankenship