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File:Radar-hauteur-en.svg

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Size of this PNG preview of this SVG file: 563 × 313 pixels. Other resolutions: 320 × 178 pixels | 640 × 356 pixels | 1,024 × 569 pixels | 1,280 × 712 pixels | 2,560 × 1,423 pixels.

Original file ‎(SVG file, nominally 563 × 313 pixels, file size: 42 KB)

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Summary

DescriptionRadar-hauteur-en.svg	Français : Hauteur du faisceau radar (AGL). Calcul de la hauteur des échos reçus par un radar météorologique ainsi que le principe d'opération. English: Height of a radar beam above Earth (AGL). Calculation of the height of radar echoes in the operating principles. Assuming the Earth is round, the radar beam in vacuum would raise according to the reverse curvature of the Earth. However, the atmosphere as an refractive index that diminish with height, due to the variation of its density. This bend the radar beam slightly toward the ground and with a standard atmosphere this is equivalent to considering that the curvature of the beam is 4/3 the actual curvature of the Earth. Depending on the elevation angle of the antenna and the other considerations, one can calculate the height above ground of the target with this formula (R. J. Doviak; D. S. Zrnic (1993). ATMS 410 – Radar Meteorology : Beam propagation (pdf).) : $H=\left({\sqrt {r^{2}+(k_{e}a_{e})^{2}+2rk_{e}a_{e}sin(\theta _{e})}}\right)-k_{e}a_{e}+h_{a}$ Where : r = distance radar-target k_e = 4/3 a_e = Earth radius θ_e = elevation angle above the radar horizon h_a = height of the feedhorn above ground.
Source	Own work
Author	VIGNERONetPierre cb
Other versions	File:Radar-hauteur-es.svg This file was derived from: Radar-height.PNG Radar-hauteur-fr.svg

Licensing

I, the copyright holder of this work, hereby publish it under the following license:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.CC BY-SA 3.0truetrue

File history

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	Date/Time	Dimensions	User	Comment
current	04:35, 21 December 2011	563 × 313 (42 KB)	Pierre cb	Added info
	16:45, 7 December 2011	563 × 313 (40 KB)	Pierre cb	Small correction
	15:11, 7 December 2011	563 × 313 (40 KB)	Pierre cb	Add colors and info from translated Radar_hateur-fr.svg
	15:30, 7 June 2008	563 × 313 (22 KB)	VIGNERON	{{Information \|Description={{fr\|1=Hauteur du faisceau radar (AGL). Calcul de la hauteur des échos reçus par un radar météorologique ainsi que le principe d'opération.}} \|Source=travail personnel (own work) \|Author=VIGNERON et [[User