# sarminaperture

Lower bound on antenna area for SAR

## Description

example

aac = sarminaperture(r,lambda,v,grazang) returns the lower bound on antenna area based on synthetic aperture radar (SAR) constraints.

example

aac = sarminaperture(r,lambda,v,grazang,dcang) specifies the Doppler cone angle that identifies the direction towards the scene relative to the direction of motion of the array.

## Examples

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Estimate the antenna area constraint of a side-looking airborne SAR operating in broadside at 16.7 GHz with a sensor velocity of 100 m/s for a target range of 10 km. Assume a nominal grazing angle of ${30}^{\circ }$.

fc = 16.7e9;
lambda = freq2wavelen(fc);
grazang =30;
v = 100;
R = 10e3;

Compute the antenna area constraint.

area = sarminaperture(R,lambda,v,grazang)
area = 4.1486e-04

## Input Arguments

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Range from target to antenna in meters, specified as a positive real scalar or a vector.

Data Types: double

Radar wavelength in meters, specified as a positive real scalar or a vector.

Data Types: double

Sensor velocity in meters per second, specified as a positive real scalar.

Data Types: double

Grazing angle in degrees, specified as a scalar in the range [0, 90].

Data Types: double

Doppler cone angle in degrees, specified as a scalar in the range [0, 180]. This argument identifies the direction toward the scene relative to the direction of motion of the array.

Data Types: double

## Output Arguments

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Upper bound on area coverage rate in square meters per second, returned as a matrix. The rows of aac correspond to the range values in r. The columns of aac correspond to the wavelength values in lambda.