D = SphericalIrradianceCovariance(alpha, d, Atm, wvl)
Computes the irradiance covariance for a spherical wave given turbulence multiplier alpha, point spacings d, atmospheric modeling data in Atm, and wavelength in wvl. In this calculation, the light propagates from the target to the platform, which is consistent with calculations of SphericalRytov and SphericalR0. Uses the weak turbulence assumption.
Parameters 
Description 
alpha [scalar] 
Turbulence strength multiplier. 
d [vector] 
Separation of the points in the aperture plane (m). 
Atm [struct] 
Atmospheric modeling structure from AtmStruct. 
wvl [scalar] 
Optical wavelength (m). 
Return Values 
Description 
B [vector] 
Irradiance covariance value 
>> alpha = 1;
>> wvl = 0.5e6;
>> G = SimpleGeom(0, 2e4, 0);
>> Atm = AtmStruct(G, 100, 'Cn2', 'HV57');
>> d = linspace(0, 0.5, 30);
>> B = SphericalIrradianceCovariance(alpha, d, Atm, wvl);
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