Accession Number:

ADP006122

Title:

Hierarchical Scattering Models,

Descriptive Note:

Corporate Author:

ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (UNITED KINGDOM)

Personal Author(s):

Report Date:

1987-05-01

Pagination or Media Count:

11.0

Abstract:

The most familiar descriptor of multi-scale structure in continuous scattering media is the power law spectra which characterises hierarchical or fractal behavior. In this paper the mathematical and phenomenological implications of adopting such models in scattering calculations will be discussed with particular reference to the statistical properties of amplitude scintillation generated by a phase changing screen or diffuser. A brief summary of results obtained when the phase itself is a Gaussian random fractal will be followed by a more detailed review of the case when the phase gradient is fractal. This last model is not only more realistic for fluid systems subject to diffuse or other smoothing effects, but is also amenable to mathematical and numerical analysis. The geometrical optics contribution to the scattered intensity pattern is particularly easy to calculate and a number of new results for the statistics of ray density fluctuations will be presented. Author

Subject Categories:

  • Radiofrequency Wave Propagation
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE