Surface clutter radar cross section (RCS)
returns the radar cross section (RCS) of a clutter patch that is of range
RCS = surfclutterrcs(
R meters away from the radar system.
el are the radar system azimuth
and elevation beamwidths, respectively, corresponding to the clutter patch.
graz is the grazing angle of the clutter patch relative to
tau is the pulse width of the transmitted signal.
The calculation automatically determines whether the surface clutter area is beam
limited or pulse limited, based on the values of the input arguments.
Compute Surface Clutter RCS
Calculate the RCS of a clutter patch and estimate the clutter-to-noise ratio (CNR) at the receiver. Assume that the patch has a normalized radar cross section (NRCS) of 1 m²/m² and is 1.0 km away from the radar system. The azimuth and elevation beamwidths are 1° and 3°, respectively. The grazing angle is 10°. The pulse width is 10μs. The radar operates at a wavelength of 1 cm with a peak power of 5 kW.
nrcs = 1; rng = 1.0e3; az = 1; el = 3; graz = 10; tau = 10e-6; lambda = 0.01; ppow = 5000; rcs = surfclutterrcs(nrcs,rng,az,el,graz,tau)
rcs = 5.2627e+03
cnr = radareqsnr(lambda,rng,ppow,tau,'rcs',rcs)
cnr = 75.2006
NRCS — Normalized radar cross section of clutter patch
Normalized radar cross section of clutter patch in units of square meters/square meters, specified as a scalar.
R — Range of clutter patch from radar system
Range of clutter patch from radar system in meters, specified as a scalar.
az — Azimuth beamwidth
Azimuth beamwidth of radar system corresponding to clutter patch in degrees, specified as a nonnegative scalar.
el — Elevation beamwidth
Elevation beamwidth of radar system corresponding to clutter patch in degrees, specified as a nonnegative scalar.
graz — Grazing angle
Grazing angle of clutter patch relative to radar system in degrees, specified as a nonnegative scalar.
tau — Pulse width of transmitted signal
Pulse width of transmitted signal in seconds, specified as a nonnegative scalar.
c — Propagation speed
physconst("LightSpeed") (default) | positive scalar
Propagation speed in meters per second, specified as a positive scalar.
343 meters per second approximates the speed of
sound at sea level and at a temperature of 20 °C under normal atmospheric
RCS — Radar cross section of clutter patch
Radar cross section of clutter patch, returned as a scalar.
You can calculate the clutter-to-noise ratio using the output of this function as the
RCSinput argument value in
 Richards, M. A. Fundamentals of Radar Signal Processing. New York: McGraw-Hill, 2005, pp. 57–63.
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Usage notes and limitations:
Does not support variable-size inputs.
Introduced in R2021a