MATLAB
`Strehl = AnisoplanaticStrehl(alpha,lambda,D,d,Atm)`

Calculates the Strehl ratio due to the effect of angular anisoplanatism given turbulence multiplier, Tx/Rx aperture diameter, anisoplanatic beam path displacement, and atmospheric modeling data. Beam displacement vector should be obtained via PathDisp to include appropriate anisoplanatic effects (angular, aperture, chromatic, etc.)

 Parameters Description alpha [scalar] Turbulence strength multiplier lambda [scalar] Wavelength of laser (m) D [scalar] Aperture diameter (m) d [matrix] Displacement of beam paths along propagation path (m). Resolved for the P axis and T axis, as calculated from PathDisp. Column 1 is displacement in P axis, col 2 is displacement in T axis, i.e., d=[d_P,d_T] Atm [struct/list] Atmospheric modeling parameters. Can be a discrete structure from AtmStruct or a comma separated list of (...x,Cn2,L) x [vector] Path-normalized screen locations along the propagation path. Cn2 [vector] Values of the refractive index structure coefficient along the path (\${m}^{-2/3}\$) L [scalar] Slant range (m)
 Return Values Description Strehl [scalar] Anisoplanatic Strehl

• Report VVA-LL-003, Revision A, titled Description and Assessment of the Airborne Laser Engagement (ABLE) Code. Section 3.5.7.1 Beacon offset Anisoplanatism, page 69.

>> G = GeomStruct;

>> Atm = AtmStruct;

>> d = PathDisp(G,Atm,'ANGULAR',1e-6,0);

>> Strehl = AnisoplanaticStrehl(1,1.315e-6,1.5,d,Atm)

• Anisoplanatic Strehl for turbulence multiplier of 1, 1 m Tx/Rx aperture, beam displacement d, and atmospheric model in Atm.

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