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

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
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
Return Values 
Description 
Strehl [scalar] 
Anisoplanatic Strehl 
References

  • 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.

Examples

>> 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.
 

See Also
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