RefractAlt

MATLAB

[hRef,dh] = RefractAlt(x,hp,ht,rd,lambda,EarthRadius)

Description

Given original altitudes of a light (laser beam) propagating along a certain path between a platform (hp) and a target (ht), RefractAlt calculates the new altitudes (h) due to refraction of light along the path, and the differences between these altitudes and the original refraction-free altitudes. Issues a warning if any of the new heights intersects earth surface.

Parameters

Parameters	Description
x [vector]	Normalized path position from aircraft to target or number of segments along the path. Use 0.9999 to calculate altitude at the target.
Geom [struct/list]	Geometry parameters. Can be a structure from GeomStruct or a comma separated list of (...,hp,ht,rd,...)
hp [vector]	Altitude of transmit/receive platform (m)
ht [vector]	Altitude of target (m)
rd [vector]	Downrange of target along curved earth surface (m)
lambda [vector]	Wavelength of laser (m)
EarthRadius [scalar]	(Optional) Spherical Earth radius (m). Default is from PhysicalConst('remean').

Return Values

Return Values	Description
hRef [vector]	Altitudes due to refraction of light along the path (m)
dh [vector]	Difference between altitudes due to refraction and the original refraction-free altitudes (m)

References

Report VVA-LL-003, Revision A, titled Description and Assessment of the Airborne Laser Engagement (ABLE) Code. Section 3.5.8.2.1 calculation of Chromatic Offset, page 78.

Group

Atmospheric Characterization

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