Aerospace and Electronic Systems Magazine December 2017 - 9

Anderson
for diffuse scattering from the one-hop zone. Energy accumulated
from these "side-scatter" contributions is superimposed on the
specular two-hop return, with the potential to obscure target echoes
[4, 5]. Moreover, this mechanism can feed corrupting echoes into
one-hop zone returns via range-folding.
To illustrate the severity of this mechanism, Figure 3 shows
model predictions of the separate contributions from a discrete fan

of rays launched at different elevation angles, with the received signal processed into range-Doppler maps. The cumulative contributions of side-scatter are spread across much of Doppler space, with
the potential to mask target echoes that would otherwise be visible.
A related situation where multizone scattering can cause serious problems is with HF surface wave radars employing broad
transmitting beams [6]. Consider the case illustrated in Figure 4a,

Figure 3.

Modelled range-Doppler maps showing (a) the one-hop zone returns from just seven rays launched at discrete elevation angles, (b) the two-hop zone
returns assuming specular reflection at the mid-point, and (c) the continuum of diffuse side-scatter contributions from just those seven rays.

Figure 4

Figure 4a. The signal path to and from the surface patch of interest, assumed to be essentially unique in most HFSWR systems.Figure 4b. A signal path
that delivers scattered energy to the receiver at the same group delay and from the same direction as the cell of interest.

DECEMBER 2017

IEEE A&E SYSTEMS MAGAZINE

7



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