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 <<O>>  Difference Topic FrankGhigo (r1.50 - 17 Jul 2008 - FrankGhigo)
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pointing model explanations

Frank,

The MR http://wiki.gb.nrao.edu/bin/view/Software/ModificationRequest1C407 contains links to documents which describe Model4 and Model5.

It also contains a link to the man page for the pointingTestUtility, which implements Model5's pointing model.

One item not well described was a change in the definition of the pointing terms. In Model4 they taken as being in reference to refracted topocentric az/el; in Model5 they are taken as being in reference to mount az/el. (Note the subscript difference in section 6 between the documents. Model4 has terms like: ... + b11 cos(Az_{ref})sin(El_{ref}) Where the term in Model5 is: ... + b11 cos(Az_{mnt})sin(El_{mnt})

This has the effect of reversing the direction of the closed form traditional model computation. In Model4 the "towards mount" computation was closed form, and the indicated to topocentric was iterative. In Model5 the topocentric to mount is iterative, and the indicated to topocentric is closed form.

Also Model4 used a number of stages/steps in performing the computations. Model5 attempts to bind all stages together.

FYI: I installed the program 'pointingTestUtility' in /home/gbt/bin.

-- jbrandt


 <<O>>  Difference Topic FrankGhigo (r1.49 - 11 Jul 2008 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.48 - 10 Jul 2008 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.47 - 03 Jul 2008 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.39 - 28 Feb 2008 - FrankGhigo)

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 <<O>>  Difference Topic FrankGhigo (r1.35 - 11 Feb 2008 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.34 - 15 Dec 2007 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.33 - 14 Dec 2007 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.31 - 13 Dec 2007 - FrankGhigo)
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Projects:


 <<O>>  Difference Topic FrankGhigo (r1.25 - 31 Oct 2007 - FrankGhigo)
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current MRs ::


 <<O>>  Difference Topic FrankGhigo (r1.24 - 12 Oct 2007 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.23 - 09 Oct 2007 - FrankGhigo)
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  • Plan for VLBI support software?


 <<O>>  Difference Topic FrankGhigo (r1.22 - 05 Oct 2007 - FrankGhigo)
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  • Other Options
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 <<O>>  Difference Topic FrankGhigo (r1.21 - 02 May 2007 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.15 - 08 May 2006 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.3 - 22 Mar 2005 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.2 - 22 Mar 2004 - FrankGhigo)
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 <<O>>  Difference Topic FrankGhigo (r1.1 - 03 Oct 2003 - FrankGhigo)
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%META:TOPICINFO{author="FrankGhigo" date="1065185622" format="1.0" version="1.1"}% %META:TOPICPARENT{name="TWikiUsers"}%

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Topic FrankGhigo . { View | Diffs | r1.50 | > | r1.49 | > | r1.48 | More }
Revision r1.1 - 03 Oct 2003 - 12:53 GMT - FrankGhigo
Revision r1.50 - 17 Jul 2008 - 00:37 GMT - FrankGhigo 		Content copyright © 1999-2007 by the contributing authors.
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