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• Name: FrankGhigo
• Login Name: fghigo
• Phone: 2208
• Department: GB
• Location: GreenBankWV
• Comment:

• Users Guide for Astrid Scripting

• PTCS
• PTCS Antenna Instrumentation
• Log Collator User Manual

• Pointing And Focus Modeling
• Todds Instructions for Pointing Model Generation
• Instructions for prepoint, makeascdb, csvmerge

• Writeup of PKS1413+135

• VLBI_point summaries
• Multi-window Doppler Tracking

• Clock offsets timer system

• new radar setup advice wiki

• Low Temperature Statistics

• Assigned Friends of GBT Projects

• GBT Images
• my regular web page

current MRs ::

• 2C707 : GFM, Prepoint, for CCB and DCR

• 4C408 : Modify Auto Peak Calibrator Selection
• My notes on Condon's calfind3 and conversion to python.

• 13C107 : Astrid: importing and moving groups of scheduling blocks

Projects:

• Phoenix Mars Lander Project

• Continuum Mapping with Obit

• Software Plan of Record C72007
• FocusPerformanceNotesMay07

• pointing development plans.

• OOF development plans

• Advice for Pulsar Observing with Astrid

• GBTIDL Documentation

• Users Guide for Astrid Source Catalogs

• Scenarios for testing Source Catalogs

• Specs for Astrid Source Catalogs

• MR for addition of source catalogsto astrid

• for LST and rise/set capabilities

pointing model explanations

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

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