Accession Number:

ADP006376

Title:

A Model for Bistatic Scattering of Electromagnetic Waves from Foliage Covered Rough Terrain,

Descriptive Note:

Corporate Author:

ROME LAB HANSCOM AFB MA

Report Date:

1991-09-01

Pagination or Media Count:

12.0

Abstract:

The problem of determining the electromagnetic EM power received by an antenna located over foliage covered rough terrain in a bistatic scattering geometry is important and quite complex. A model has been developed which can quantitatively determine the effect of a foliage layer on EM waves scattered from rough terrain. The theoretical approximations obtained from this model are compared with data at two levels the loss in penetrating the foliage and the total normalized scattering cross section. In the model, a transmitting antenna and receiving antenna are located at arbitrary heights and locations over a surface with two scales of roughness covered by a foliage layer. Both the coherent and incoherent power scattered into the receiver are calculated. It is assumed that the foliage is sufficiently sparse that the coherent field is dominant over the incoherently scattered waves within the medium. The propagation of the coherent field in the foliage is characterized by an effective complex dielectric constant. Explicit expressions for have been determined from several multiple scattering formalisms and are based on the dielectric properties of the scattering elements comprising the foliage, i.e. wood, leaves, blades of grass.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE