Page 110 - Fundamentals of Radar Signal Processing

FIGURE 2.7 Polar plot of the data of Fig. 2.6.

The relative RCS of a target with multiple scatterers can be computed as a
function of θ and λ using a generalization of Eq. (2.47). Suppose there are N
scatterers, each with its own RCS σ , located at ranges R(θ) from the radar.
i
i
Note that the ranges R vary with aspect angle θ. The complex voltage of the
i
echo will be, to within a proportionality constant

(2.49)

Each term in Eq. (2.49) represents the echo from a single scatterer. This
equation highlights an extremely important characteristic of these echoes. In
addition to being scaled by the scatterer reflectivity, each term is also phase-