# sarchirprate

Azimuth chirp rate of received signal for SAR

## Description

example

acr = sarchirprate(r,lambda,v) computes the nominal azimuth chirp rate at which the azimuth signal changes frequency as the sensor illuminates a scatterer.

example

acr = sarchirprate(r,lambda,v,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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Compute the azimuth chirp rate of received signal for a side-looking airborne synthetic aperture radar (SAR) operating in broadside at a wavelength of 0.03 m with a sensor velocity of 100 m/s for a target at 10 km. The sensor illuminates the scatterer at a Doppler cone angle of ${90}^{\circ }$.

lambda = 0.03;
R = 10e3;
v = 100;

Compute the azimuth chirp rate.

azchirp = sarchirprate(R,lambda,v)
azchirp = 66.6667

## 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

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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Nominal azimuth chirp rate in hertz per second, returned as a matrix. The rows of acr correspond to the range values in r. The columns of acr correspond to the wavelength values in lambda.