Page 107 - Fundamentals of Radar Signal Processing

FIGURE 2.4 Square trihedral corner reflector.

(2.45)

Thus the RCS increases with increasing frequency. On the other hand, at least
one frequency-and aspect-independent scatterer exists. The RCS of a conducting
2
sphere of radius a is a constant πa , provided a λ. It is independent of aspect
angle because of the spherical symmetry.
A simple example of frequency and aspect dependence is the two-scatterer

“dumbbell” target of Fig. 2.5. If the nominal range R is much greater than the
separation D, the range to the two scatterers is approximately

FIGURE 2.5 Geometry for determining relative RCS of a “dumbbell” target.

(2.46)

If the signal a · exp(j2πFt) is transmitted, the echo from each scatterer will be
proportional to a · exp[j2πF(t – 2R (θ))/c]. The voltage of the composite
1,2