Modeling of Beam Wave Pulse Propagation in Vegetation Using Transport Theory
Abstract
The scalar time-dependent equation of radiative transfer in cylindrical coordinates was used to develop several new theories- both rigorous and approximate- for propagation and scattering of beam wave pulse trains in vegetation modeled as a random medium of discrete scatterers. Plots of specific intensity and received power in the random medium (vegetation) showed distortion due to pulse broadening, angular spread, power attenuation (especially at large penetration depths), and out-of-beam scattering. To allow for near-real-time modeling (of interest to the soldier in the field), three new approximate theories for beam wave propagation in vegetation were developed and numerically compared to the rigorous theory. A first order theory was shown to agree with the rigorous theory at short vegetation penetration depths; at larger depths, it agrees in the forward scatter direction only, but not otherwise. An asymptotic theory was shown to have the correct behavior in all scatter directions and to agree with the rigorous theory at large penetration depths. The third approximate theory was a composite solution which combined both the first order solution and the asymptotic solution and closed the gap between the first two approximate theories.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 2005
- Accession Number
- ADA437657
Entities
People
- Felix K. Schwering
- Gerald M. Whitman
- Michael Yu-chi Wu
Organizations
- New Jersey Institute of Technology