# clutterVolumeRCS

Since R2021a

## Description

example

rcs = clutterVolumeRCS(volrefl,vol) returns the radar cross-section (RCS) of volume clutter defined by the resolution of the radar.

## Examples

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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)')

## Input Arguments

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Volume reflectivity of scattering particles in square meters per cubic meter, specified as a scalar or a vector.

Data Types: double

Clutter extent, specified as a positive real scalar or a 1-by-3 row vector.

• If specified as a positive real scalar, vol represents the volume of the clutter in cubic meters.

• If specified as a 1-by-3 row vector:

• The first element of vol is a positive real scalar that represents the clutter within the range resolution in meters of the radar.

• The second element of vol is a positive real scalar that represents the clutter within the azimuth (or cross-range) resolution in meters of the radar.

• The third element of vol is a positive real scalar that represents the clutter within the elevation resolution in meters of the radar.

Data Types: double

## Output Arguments

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Radar cross-section of volume clutter in square meters, returned as a scalar or a vector. rcs has the same dimensions as volrefl.

## Version History

Introduced in R2021a