Radar cross-section of volume clutter
Radar Cross-Section of Rain
Estimate the radar cross-section of rain for a side-looking airborne SAR operating in the L band at 1.5 GHz. The rain is specified by a range resolution of 15 m, an azimuth resolution of 18 m, and a rain elevation cell resolution of 20 m. The rain rates are 0.25 mm/hr, 1 mm/hr, 4 mm/hr, and 16 mm/hr.
f = 1.5e9; rngres = 15; azres = 18; elres = 20; res = [rngres azres elres]; rr = [0.25 1 4 16];
Compute the rain radar cross-section. Use
rainreflectivity to compute the volume reflectivity of the scattering particles.
volref = rainreflectivity(f,rr); rcs = clutterVolumeRCS(volref,res);
Plot the rain radar cross-section as a function of the rain rate. Express the cross-section in dB.
semilogx(rr,pow2db(rcs),'.-') xlabel('Rain Rate (mm/hr)') ylabel('Rain RCS (dBsm)')
volrefl — Volume reflectivity of scattering particles
real scalar | vector
Volume reflectivity of scattering particles in square meters per cubic meter, specified as a scalar or a vector.
vol — Clutter extent
positive real scalar | 1-by-3 row vector
Clutter extent, specified as a positive real scalar or a 1-by-3 row vector.
If specified as a positive real scalar,
volrepresents the volume of the clutter in cubic meters.
If specified as a 1-by-3 row vector:
The first element of
volis a positive real scalar that represents the clutter within the range resolution in meters of the radar.
The second element of
volis a positive real scalar that represents the clutter within the azimuth (or cross-range) resolution in meters of the radar.
The third element of
volis a positive real scalar that represents the clutter within the elevation resolution in meters of the radar.