Aerospace and Electronic Systems Magazine December 2017 - 8

OTH Radar Phenomenology

Figure 1.

Discrimination between space-like and time-like events in the radar process to facilitate model development [6]. Here the large red arrows show the
signal path in space-time, from start to the end at the same spatial location, ie, a monostatic radar configuration. Panels 1 and 2 are self-explanatory; the
third panel represents the correlation of space-like separated events in the spectral domain.

Figure 2.

Multihop skywave propagation showing specular and diffuse scattering in the first scattering zone.

processes, with space-like and time-like separation, respectively,
where the scales are set by the spatial and temporal scales of
the radar measurement. Thus, with rough surface scattering, for
example, events within a single radar resolution cell are often
modelled as having space-like separation,
 so intra-cell multiple
scattering is more naturally handled in k space. In most HF radar
applications it is meaningful to refer to multiple scattering from
time-like separated regions as multizone scattering. Figure 1
attempts to represent these ideas schematically in Minkowski
space.
6

PHENOMENA EMERGING FROM REFINED MODELS
PROPAGATION
The radar process model accounts explicitly for multiple scattering between time-like separated regions. As a first example of this
phenomenon in action, consider the case of multihop propagation,
as shown in Figure 2.
A simple model would have us assume a specular reflection
at the first ground bounce point, but a more refined model allows

IEEE A&E SYSTEMS MAGAZINE

DECEMBER 2017



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