nusolve-discuss Mailing List for nuSolve
Geodetic VLBI data analysis software.
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From: Bolotin, S. (GSFC-61A.0)[N. INC] <ser...@na...> - 2019-03-29 17:04:54
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Hi Maria, Different types of correlator use different approaches to chose the reference epoch. Also, the reference epoch not necessary be equal to the corresponding scan name. For example, the session R4883, 19FEB28XE: the scan "059-1833" has a reference epoch of "2019/02/28 18:34:07.0". And vgosDb here just a container that keeps data together. Of course, there can be bugs in the software; if you doubt, you can verify the reference epochs by inspecting files generated by fourfit (or other similar program). The reference epoch is stored in "type 200" structure (see https://www.haystack.mit.edu/tech/vlbi/hops/mk4_files.txt). The software HOPS provide an utility "CorAsc2" that makes ASCII output of fringe files. Also, nusolve package in "/test" directory has a utility "FRN_dump" that makes the same. So, you can compare outputs generated by two different correlators. Kindly yours, Sergei. Kindly yours, Sergei. ________________________________________ From: Maria Gomez <mar...@u-...> Sent: Friday, March 29, 2019 11:58 To: nus...@li... Subject: [Nusolve-discuss] time tag difference from two vgos db for the same session Dear Nusolve community: I am comparing two vgosDb files obtained after the fringe fitted data that comes from two different correlators. They have a different amount of observations, so I am trying to get the time tag and group delay for each time tag in order to compare the Group Delay (GD) from both correlators. But... when exporting the information of YMDHM from (TimeUTC.nc) located in folder Observables of the vgosDb, I get the following: CORR1 (Y M D H M GD) : 18 12 11 8 41 -0.0159783695 18 12 11 8 43 -0.00355206277 18 12 11 8 44 0.0117426847 18 12 11 8 44 -0.00543452856 18 12 11 8 44 -0.00268836341 : CORR2 (Y M D H M GD) : 18 12 11 8 41 -0.0159783437 18 12 11 8 43 -0.00355176229 18 12 11 8 43 0.011727293 18 12 11 8 43 -0.00543281997 18 12 11 8 43 -0.0026873684 : There is a difference in the time tag. I tried obtaining the vgosDb files in two different computers and it is exactly the same. As far as I know, the scans are named with : DoY-HHMM, so if I have some information at 8:44 from the DoY:345, then I should have had an scan named: 345-0844. But this scan was excluded from any post-processing. Do you have any idea on what can be causing this difference in time-tagging? Best regards Maria Eugenia Gomez -- Maria Eugenia Gomez Postdoctoral researcher Laboratoire d'astrophysique de Bordeaux Université de Bordeaux - CNRS [Logo du LAB]<https://urldefense.proofpoint.com/v2/url?u=http-3A__astrophy.u-2Dbordeaux.fr_&d=DwMFaQ&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiMk5Csz9Zk&r=aaMV06N4pRmMGrN3KljC9bFsjShxxnf-4WusV4lax3w&m=7dGeRdv6We9U2tdJ_2EcCcURilGXe0WoYehO-7iabZI&s=rZbTgRLxDetUrrPfGMIfJ2Mryc7grPi0aeTcVZVOCUE&e=> Université de Bordeaux - Bât. B18N Allée Geoffroy Saint-Hilaire CS 50023 33615 Pessac Cedex France +33 (0)5 40 00 21 88 |
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From: Maria G. <mar...@u-...> - 2019-03-29 15:58:13
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Dear Nusolve community: I am comparing two vgosDb files obtained after the fringe fitted data that comes from two different correlators. They have a different amount of observations, so I am trying to get the time tag and group delay for each time tag in order to compare the Group Delay (GD) from both correlators. But... when exporting the information of YMDHM from (TimeUTC.nc) located in folder Observables of the vgosDb, I get the following: CORR1 (Y M D H M GD) : 18 12 11 8 41 -0.0159783695 18 12 11 8 43 -0.00355206277 18 12 11 8 44 0.0117426847 18 12 11 8 44 -0.00543452856 18 12 11 8 44 -0.00268836341 : CORR2 (Y M D H M GD) : 18 12 11 8 41 -0.0159783437 18 12 11 8 43 -0.00355176229 18 12 11 8 43 0.011727293 18 12 11 8 43 -0.00543281997 18 12 11 8 43 -0.0026873684 : There is a difference in the time tag. I tried obtaining the vgosDb files in two different computers and it is exactly the same. As far as I know, the scans are named with : DoY-HHMM, so if I have some information at 8:44 from the DoY:345, then I should have had an scan named: 345-0844. But this scan was excluded from any post-processing. Do you have any idea on what can be causing this difference in time-tagging? Best regards Maria Eugenia Gomez -- Maria Eugenia Gomez Postdoctoral researcher Laboratoire d'astrophysique de Bordeaux Université de Bordeaux - CNRS [ http://astrophy.u-bordeaux.fr/ ] Université de Bordeaux - Bât. B18N Allée Geoffroy Saint-Hilaire CS 50023 33615 Pessac Cedex France +33 (0)5 40 00 21 88 |
