Radar Cross Section (RCS) - MATLAB Simulations for Radar Systems Design - page 529

Z

radar

θ

-b/2

b/2

Y

ϕ

a

X

Figure 11.28. Coordinates for a perfectly conducting isosceles triangular plate.

4π A 2
λ 2

) 4 ) 2 ( sin α ( sin 2α – 2α

) 2

-------------

σ = ( cos θ ------------------ + -----------------------------------

(11.66)

α 4 4α 4

and for incidence in the plane ϕπ2 = ⁄

4π A 2
λ 2

) 4 ( sin ( β 2 ⁄ )

) 2

------------- ------------------------------

σ = ( cos θ

(11.67)

) 4 ( β 2 ⁄

Fig. 11.29 shows a plot for the normalized backscattered RCS from a per-
fectly conducting isosceles triangular flat plate. In this example ,
. This plot can be reproduced using MATLAB function
Ðrcs_isosceles.mÑ given in Listing 11.11 in Section 11.9.

a = 0.2 m

b = 0.75 m

MATLAB Function Ðrcs_isosceles.mÑ

The function Ðrcs_isosceles.mÑ calculates and plots the backscattered RCS
of a triangular flat plate. Its syntax is as follows:

[rcs] = rcs_isosceles (a, b, freq, phi)

where

Symbol Description Units Status

a height of plate meters input

b base of plate meters input

freq frequency Hz input

phi roll angle degrees input

rcs array of RCS versus aspect angle dBsm output