Radar cross-section pattern
rcsSignature creates a radar cross-section (RCS) signature object. You can
use this object to model an angle-dependent and frequency-dependent radar cross-section
pattern. The radar cross-section determines the intensity of reflected radar signal power from
a target. The object models only non-polarized signals.
rcssig = rcsSignature
rcsSignature object with default property values.
sets object properties using one or more
rcssig = rcsSignature(
Name,Value pair arguments.
Name is a property name and
Value is the corresponding
Name must appear inside single quotes (
can specify several name-value pair arguments in any order as
Name1,Value1,...,NameN,ValueN. Any unspecified properties take default
Pattern— Sampled radar cross-section pattern
[10 10; 10 10](default) | Q-by-P real-valued matrix | Q-by-P-by-K real-valued array
Sampled radar cross-section (RCS) pattern, specified as a scalar, a Q-by-P real-valued matrix, or a Q-by-P-by-K real-valued array. The pattern is an array of RCS values defined on a grid of elevation angles, azimuth angles, and frequencies. Azimuth and elevation are defined in the body frame of the target.
Q is the number of RCS samples in elevation.
P is the number of RCS samples in azimuth.
K is the number of RCS samples in frequency.
Q, P, and K usually match
the length of the vectors defined in the
respectively, with these exceptions:
To model an RCS pattern for an elevation cut (constant azimuth), you can
specify the RCS pattern as a Q-by-1 vector or a
1-by-Q-by-K matrix. Then, the elevation
vector specified in the
Elevation property must have length
To model an RCS pattern for an azimuth cut (constant elevation), you can
specify the RCS pattern as a 1-by-P vector or a
1-by-P-by-K matrix. Then, the azimuth
vector specified in the
Azimuth property must have length
To model an RCS pattern for one frequency, you can specify the RCS pattern as
a Q-by-P matrix. Then, the frequency vector
specified in the
Frequency property must have length
Azimuth— Azimuth angles
[-180 180](default) | length-P real-valued vector
Azimuth angles used to define the angular coordinates of each column of the matrix
or array, specified by the
Pattern property. Specify the azimuth
angles as a length-P vector. P must be greater
than two. Angle units are in degrees.
Elevation— Elevation angles
[-90 90](default) | length-Q real-valued vector
Elevation angles used to define the coordinates of each row of the matrix or array,
specified by the
Pattern property. Specify the elevation angles as
a length-Q vector. Q must be greater than two.
Angle units are in degrees.
Frequency— Pattern frequencies
[-90 90](default) | length-K real-valued vector
Frequencies used to define the applicable RCS for each page of the
Pattern property. Specify the frequencies as a
length-K vector. K must be greater than two.
Frequency units are in hertz.
|value||Radar cross-section at specified angle and frequency|
Specify the radar cross-section (RCS) of a triaxial ellipsoid and plot RCS values along an azimuth cut.
Specify the lengths of the axes of the ellipsoid. Units are in meters.
a = 0.15; b = 0.20; c = 0.95;
Create an RCS array. Specify the range of azimuth and elevation angles over which RCS is defined. Then, use an analytical model to compute the radar cross-section of the ellipsoid. Create an image of the RCS.
az = [-180:1:180]; el = [-90:1:90]; rcs = rcs_ellipsoid(a,b,c,az,el); rcsdb = 10*log10(rcs); imagesc(az,el,rcsdb) title('Radar Cross-Section') xlabel('Azimuth (deg)') ylabel('Elevation (deg)') colorbar
rcsSignature object and plot an elevation cut at azimuth.
rcssig = rcsSignature('Pattern',rcsdb,'Azimuth',az,'Elevation',el,'Frequency',[300e6 300e6]); rcsdb1 = value(rcssig,30,el,300e6); plot(el,rcsdb1) grid title('Elevation Profile of Radar Cross-Section') xlabel('Elevation (deg)') ylabel('RCS (dBsm)') function rcs = rcs_ellipsoid(a,b,c,az,el) sinaz = sind(az); cosaz = cosd(az); sintheta = sind(90 - el); costheta = cosd(90 - el); denom = (a^2*(sintheta'.^2)*cosaz.^2 + b^2*(sintheta'.^2)*sinaz.^2 + c^2*(costheta'.^2)*ones(size(cosaz))).^2; rcs = (pi*a^2*b^2*c^2)./denom; end
 Richards, Mark A. Fundamentals of Radar Signal Processing. New York, McGraw-Hill, 2005.