HufnagelValley

MATLAB

Cn2 = HufnagelValley(h,[v],[A])
Cn2 = HufnagelValley(h,lambda,r0,theta0)

Description

Returns the value of the Hufnagel-Valley turbulence profile given altitude above sea level in meters. Defaults to HV (5/7) if v and A are not passed. Can also compute and use v and A if wavelength, r0, and theta0 are provided.

Parameters

Parameters	Description
h [vector]	Altitude above sea level (m)
v [scalar]	(Optional) High altitude wind speed (m/s). Defaults to 21 m/s.
A [scalar]	(Optional) Strength of turbulence near the ground (${m}^{-2/3}$). Defaults to 1.7e-14 ${m}^{-2/3}$. OR
lambda [scalar]	Laser wavelength (m). Defaults to 500 nm. Can pass empty ([]) to use default value and specify r0 and theta0.
r0 [scalar]	Fried parameter (m). Defaults to 0.05 m. Can pass empty ([]) to use default value and specify theta0.
theta0 [scalar]	Isoplanatic angle (rad). Defaults to 7e-6 rad. Can pass empty ([]) to use default value.

Return Values

Return Values	Description
Cn2 [vector]	Index of refraction structure coefficient (${m}^{-2/3}$)

References

R. R. Beland, "Propagation Through Atmospheric Optical Turbulence," in The Infrared and Electro-Optical Systems Handbook, vol. 2, Chap. 2, F. G. Smith, Ed. Bellingham, WA: SPIE, 1993.
Robert K. Tyson "Principles of Adaptive Optics", 2nd Ed., Academic Press, Boston, 1998