Aerospace and Electronic Systems Magazine December 2017 - 11

Anderson
However, as a unique experiment showed [8], depolarization also occurs; this is coupled to mediuminduced phase modulation and has implications for radar design, signal processing, and echo interpretation.
To handle this effect, the phenomenological mapping
of the sequence of transformations on the Poincare
sphere must be generalised to allow for stochastic
states inside the sphere. An example of the variation
of the degree of polarization is shown in Figure 7.
While it is true that polarimetric skywave radar
has yet to be implemented as an operational system,
experiments towards that end continue to be undertaken, along with the development of generalized signal processing techniques.
As a final example of what happens when one
refines the propagation phenomenology, consider
the case of a radar illuminating an aircraft in the onehop zone, as illustrated in Figure 8. The conventional
model employed in OTH radar for tracking purposes
allows for specular reflection at the Earth's surface,
leading to the well-known 4-ray model. What this
model ignores, though, is diffuse scatter from the region within the radius to the aircraft's horizon, both
en route to the target and en route to the receiver. To

Figure 7.

Variation of the degree of polarization of a skywave signal over an interval of several minutes [8]. The horizontal plane is the Mercator representation of the surface of the Poincare
sphere.

Figure 8.

Schematic showing the geometry of the diffuse scatter paths.

DECEMBER 2017

IEEE A&E SYSTEMS MAGAZINE

9



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