Inversion of Data for Near-Grazing Propagation Over Graveled Surfaces

Abstract

Data obtained for low-frequency propagation over gravel-covered rigid planes are inverted by applying the procedure developed for regularly shaped protuberances. The development is based on analytical results for a point source irradiating an embossed plane, and on the uniform asymptotic form of the coherent field as a Sommerfeld type wave system in terms of the complex error function complement (Q). Initial estimates of unknown parameters are obtained by working with elementary approximations of the Q integral, and then used in the complete integral for refinements and final computations. The procedure delineates the roles of interference and damping on the elementary wave components of the Q system, and the resulting graphs display the primary data trends. Reprints. (jhd)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1987
Accession Number
ADA222178

Entities

People

  • R. J. Lucas
  • V. Twersky

Organizations

  • University of Illinois at Chicago

Tags

DTIC Thesaurus Topics

  • Computations
  • Data Reduction
  • Dispersing
  • Dispersions
  • Frequency
  • Illinois
  • Incoherent Scattering
  • Integrals
  • Inversion
  • Microphones
  • Plane Waves
  • Reflection
  • Scattering
  • Transducers
  • Waves

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering