SAR azimuth processing gain
Compute the azimuth processing gain of a side-looking airborne SAR operating in broadside at a wavelength of 0.05 m with a sensor velocity of 100 m/s and a PRF of 2 kHz for a target at 5 km. The cross-range resolution of the image is 1.5 m. Assume an azimuth broadening factor of 1.2 and a nonideal azimuth filtering loss of 1.2 dB.
lambda = 0.05; PRF = 2e3; R = 5e3; res = 1.5; v = 100; La = 1.2; azb = 1.2;
Compute the azimuth processing gain.
azgain = sarazgain(R,lambda,v,res,PRF,'AzimuthBroadening',azb, ... 'AzimuthFilteringLoss', La)
azgain = 31.8103
r— Range from target to antenna
Range from target to antenna in meters, specified as a positive real scalar or a vector.
lambda— Radar wavelength
Radar wavelength in meters, specified as a positive real scalar or a vector.
v— Sensor velocity
Sensor velocity in meters per second, specified as a positive real scalar.
azres— Image azimuth or cross-range resolution
Image azimuth or cross-range resolution in meters, specified as a positive real scalar.
prf— Radar pulse repetition frequency
Radar pulse repetition frequency (PRF) in hertz, specified as a positive real scalar.
comma-separated pairs of
the argument name and
Value is the corresponding value.
Name must appear inside quotes. You can specify several name and value
pair arguments in any order as
AzimuthBroadening— Azimuth impulse broadening factor
1(default) | positive real scalar
Azimuth impulse broadening factor due to data weighting or windowing for sidelobe control, specified as a positive real scalar. This argument expresses the actual –3 dB mainlobe width with respect to the nominal width. Typical window functions like
hann exhibit values in the range from 1 to 1.5.
AzimuthFiltering Loss— Reduction in SNR gain
0(default) | nonnegative scalar
Reduction in signal-to-noise ratio (SNR) gain in decibels, specified as a nonnegative scalar. This argument corresponds to the loss with respect to the ideal gain. Typical window functions like
hann exhibit losses on the order of 1 dB. The argument defaults to
0, which assumes a rectangular window.
ConeAngle— Doppler cone angle
90(default) | scalar in the range [
Doppler cone angle in degrees, specified as a scalar in the range [
180]. This argument identifies the direction toward the scene
relative to the direction of motion of the array.