Radar Cross Section (RCS) - MATLAB Simulations for Radar Systems Design - page 518

Figure 11.20. Backscattered RCS for a circular flat plate.

11.5.4. Truncated Cone (Frustum)

Figs. 11.21 and 11.22 show the geometry associated with a frustum. The half
cone angle α is given by

( r 2 – r 1 ) r 2

----

tan α = -------------------- =

(11.38)

H

Define the aspect angle at normal incidence with respect to the frustumÓs
surface (broadside) as . Thus, when a frustum is illuminated by a radar
located at the same side as the coneÓs small end, the angle

θ n

θ n is

θ n = 90°α – (11.39)

Alternatively, normal incidence occurs at

θ n = 90°α +

(11.40)

At normal incidence, one approximation for the backscattered RCS of a trun-
cated cone due to a linearly polarized incident wave is