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RefractAlt
[hRef,dh] = RefractAlt(x,hp,ht,rd,lambda,EarthRadius)
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.
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Parameters |
Description |
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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. |
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Geom [struct/list] |
Geometry parameters. Can be a structure from GeomStruct or a comma separated list of (...,hp,ht,rd,...) |
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hp [scalar] |
Altitude of transmit/receive platform (m) |
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ht [scalar] |
Altitude of target (m) |
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rd [scalar] |
Downrange of target along curved earth surface (m) |
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lambda [scalar] |
Wavelength of laser (m) |
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EarthRadius [scalar] |
(Optional) Spherical Earth radius (m). Default is from PhysicalConst('remean'). |
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Return Values |
Description |
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hRef [vector] |
Altitudes due to refraction of light along the path (m) |
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dh [vector] |
Difference between altitudes due to diffraction and the original diffraction-free altitudes (m) |
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.
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Copyright (c) 2009. All rights reserved.
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Description