| Item |
Author |
- Brief
description of the historical view on through wall propagation, including
a literature survey and a discussion of how promising the future of
through wall imaging might be.
|
Ali |
- Introduction to
Attenuation and Dispersion (Def)
- Electric
properties of various walls are discussed. In particular, attention
is focused on complex propagation constant, attenuation coefficient, phase
constant, permittivity and permeability of wall materials, dielectric
polarization loss, conductivity loss, loss tangent, etc.
- The
effects of temperature and humidity on electric properties of wall
materials are also addressed.
- Various
types of walls, including homogeneous, inhomogeneous, and
multi-layered walls, are examined.
|
Sunaidi |
-
Material
parameters reported in the literature, propagation through common
construction walls, such as glass, wood, plasterboard, etc., at different
frequencies is discussed. Measured and simulated results are
compared and the range of applicability of propagation models is
addressed.
-
The
influence of antenna radiation characteristics on through wall
propagation is studied. In particular, the effects of antenna polarization
and gain, and the incident angle on received signals are investigated.
|
Jazi |
-
Measurement techniques for extracting electric properties of wall
materials are described and available results in the literature are
presented.
-
Modeling of walls in the time and frequency domains, using transfer
function and impulse response methods, is discussed. Existing
parametric models for through wall propagation are reviewed.
Deterministic (EM) models as well as statistical models are
examined.
|
Ali |
-
To
conclude the chapter, we propose some means to overcome the existing
challenges and some of the new technologies such as ultra wideband (UWB)
communications and how they can improve through wall imaging.
|
Jazi |