CARMA Baseline Solutions


Applying Baseline


Baseline Solutions

Config Solution Use from Use until Data taken on Status Notes
C + SH
antpos.140228 26 February 2014 ... February 28, 2014   CARMA23 (1cm)
First C and eighth SH arrays baseline solutions. Refant = C8. All moved antennas show displacements of few cm.
D + SH
antpos.140124 24 January 2014 26 February 2014 January 24, 2014   CARMA23 (1cm)
Third D and seventh SH arrays baseline solutions. Refant = C8. No significant changes from previous solutions, i.e. displacements < 0.01ns.
D + SH
antpos.131223 17 December 2013 23 January 2014 December 23, 2013   CARMA23 (3mm)
Second D and sixth SH arrays baseline solutions. Refant = C8. C20 and C23 had problems at the 3mm receivers and no new solutions could be derived. First solutions for C9, C11, C12. Displacements of the order of few cm.
D + SH
antpos.131222 17 December 2013 December 17, 2013 December 22, 2013   CARMA23 (1cm)
First D and fifth SH arrays baseline solutions. Refant = C8. C9, C11, C12 had problems at the 1cm receivers and no solutions could be derived. Displacements of the order of few cm.
B + SH
antpos.131125 25 November 2013 16 December 2013 November 23, 2013   CARMA23 (1cm)
First B and fourth SH arrays baseline solutions. Refant = C11. All CARMA15 antennas, except for C11, were moved and show very large displacements, of the order of ~10 cm.
C + SH
antpos.131110 10 November 2013 November 23, 2013 November 10, 2013   CARMA23 (1cm)
Second C and third SH arrays baseline solutions. Refant = C11. C2 was out of the array and no new solutions were derived for this antenna. All antennas do not show significant displacements from previous solutions, i.e. < 0.01 ns.
C + SH
antpos.131020 20 October 2013 9 November 2013 October 20, 2013   CARMA8 (1cm)
Second SH arrays baseline solutions. Refant = C16. First solutions for C21 in this configuration. All other 3.5m antennas do not show significant displacements from previous solutions.
C + SH
antpos.131011 7 October 2013 19 October 2013 October 11, 2013   CARMA23 (1cm)
First C and SH arrays baseline solutions. Refant = C11. No solutions for C21 which was not in the array during the baseline track. All moved antennas showed displacements of around 1 cm from previous solutions.
E + SL
antpos.130928 28 September 2013 7 October 2013 September 28, 2013   CARMA23 (3mm)
Third E and SL arrays baseline solutions. Refant = C11. No significant changes compared with previous solutions, i.e. < 0.01 ns. No new solutions for C21 and C23 which showed no data in the second half of the track and no coherence, respectively.
E + SL
antpos.130815 16 August 2013 September 27, 2013 August 15, 2013   CARMA23 (1cm)
Second E and SL arrays baseline solutions. Refant = C11. No significant changes compared with previous solutions, i.e. < 0.01 ns. No new solutions for C12 which was out of the array during the observations.
E + SL
antpos.130717 17 July 2013 15 August 2013 July 17, 2013   CARMA23 (3mm)
First E and SL arrays baseline solutions. Refant = C12.
D + SL
antpos.130531 30 May 2013 15 July 2013 May 31, 2013   CARMA23 (3mm)
First D and SL arrays baseline solutions. Refant was C11. Significant antenna displacements, between about 1 and 6cm, for C1,C2,C4,C5,C6,C7,C9,C10,C12,C13,C15,C17,C21,C22.
C + SH
antpos.130511 11 May 2013 29 May 2013 May 11, 2013   CARMA23 (3mm)
Second C and seventh SH arrays baseline solutions. Refant was C11. No significant displacements when compared with previous solutions.
C + SH
antpos.130404 4 April 2013 10 May 2013 April 4, 2013   CARMA23 (3mm)
First C and sixth SH arrays baseline solutions. Refant was C11. All the moved antennas, i.e. C1, C2, C4, C5, C6, C7, C9, C10, C12, C13, C15, show significant displacements (few mm to cm) when compared with previous solutions.
D + SH
antpos.130316 March 16, 2013   CARMA23 (3mm)
First D and fifth SH arrays baseline solutions. Refant was C11. All the moved antennas, i.e. C10, C14, C15, C18, C19, show significant displacements (> 1cm) when compared with previous solutions.
DE + SH
antpos.130307 March 7, 2013   CARMA23 (1cm)
Fourth DE and SH arrays baseline solutions. Refant was C11. New solutions do not show any significant displacement (< 1mm) when compared with previous solutions.
DE + SH
antpos.130217 February 17, 2013   CARMA23 track
Third DE and SH arrays baseline solutions. Refant was C11. First solutions for C18, C19, both antennas showing significant displacements, C19 as large as 1.2 meters.
DE + SH
antpos.130213 February 13, 2013   CARMA23 track
Second DE and SH arrays baseline solutions. Refant was C11. First solutions for C8, C9, C14, C15 which had problems in the previous track. No solutions could be derived for C18, C19.
DE + SH
antpos.130210 February 10, 2013   CARMA23 track
First DE and SH arrays baseline solutions. Refant was C11. Some antennas (C8, C9, C14, C15, C18, C19) showed problems during the track and no solutions could be derived. For all the other antennas, displacements are significant, i.e. larger than few mm.
B + SL
antpos.130131 January 31, 2013   CARMA23 track
Third and last B array baseline solutions, and new antenna positions for the 3.5m antennas. Refant was C11. First solutions for C12. These solutions were obtained after changing the pad offset constants. Because of this, all the 3.5m antennas show a nearly constant displacement of about 0.33 ns.
B + SL
antpos.130118 January 18, 2013   CARMA23 track
Second B array baseline solutions, and new antenna positions for the 3.5m antennas. Refant was C11. First solutions for C14 and C17 which were out of the array in the previous baseline track on Jan 12. C12 is still out of the array and no solutions have been derived for that antenna yet.
B + SL
antpos.130112 January 12, 2013   CARMA23 track
First B array baseline solutions, and new antenna positions for the 3.5m antennas. Refant was C11. Observations were taken in marginal weather conditions and solutions are not very accurate. Note that C12, C14, C17 were out of the array during the baseline track so for these antennas new solutions could not be derived.
C + SL
antpos.130104 January 4, 2013   CARMA23 track
Last C array baseline solutions, and new antenna positions for the 3.5m antennas. Refant was C11. Compared with previous solutions only C22 shows significant displacement (few mm).
C + SL
antpos.121204 November 30, 2012   no new data
Compared with the previous antpos file, i.e. antpos.121130, this contains improved solutions for C15.
C + SL
antpos.121130 November 30, 2012   CARMA23 track
Second C array baseline solutions, antenna positions for the 3.5m antennas are the same as the previous antpos.121129 file (CARMA23 track at 3mm). Refant was C11. This contains the first solutions for C15. However, weather during the track was relatively bad and this solution is likely not accurate. Look for the most recent antpos files when reducing data taken in this array configuration.
C + SL
antpos.121129 November 29, 2012   CARMA23 track
First C array baseline solutions and third baseline solutions for SL array (CARMA23 track at 3mm). Refant was C11. Significant changes (> few mm) to all the moved antennas, i.e. 1, 3, 4, 5, 6, 7, 9, 10, 12, 13. Note that C15 was offline during the track and so the antenna position for this antenna is not accurate. Look for the most recent antpos files when reducing data taken in this array configuration.
D + SL
antpos.121107 November 7, 2012   CARMA23 track
Second D array baseline solutions and second baseline solutions for SL array (CARMA23 track at 3mm). Positions relative to C11. Significant changes (few mm) to the previous solutions only for C22.
D + SL
antpos.121003 October 3, 2012   CARMA23 track
First D array baseline solutions and first baseline solutions for SL array (CARMA23 track at 3mm). Positions relative to C11. Significant changes (few cm) to the previous solutions for all the moved antennas.
E + SH
antpos.120929 September 29, 2012   CARMA23 track
Fourth and last E array baseline solutions and sixth and last baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C11. No significant change to the previous solutions (i.e. displacements < 0.01 ns).
E + SH
antpos.120824 August 24, 2012   CARMA23 track
Third E array baseline solutions and fifth baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C11. No significant change to the previous solutions (i.e. displacements < 0.01 ns).
E + SH
antpos.120704 July 4, 2012   CARMA23 track
Second E array baseline solutions and fourth baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C11; good solutions for all antennas, including C20 (which was out of the array in the previous baseline track). No significant change to the previous solutions (i.e. displacements < 0.01 ns).
E + SH
antpos.120629 June 29, 2012   CARMA23 track
First E array baseline solutions and third baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C8; good solutions for all antennas, except for C20 which was out of the array. All the moved antennas (1,2,3,4,5,6,10,11,14,15,20) showed displacements of a few cm from the last solutions for the positions of the same pads.
D + SH
antpos.120608 June 08, 2012   CARMA23 track
Fourth and last D array baseline solutions and second baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C11; good solutions for all antennas. No significant changes to the previous solutions (displacements < 0.01 ns).
D + SH
antpos.120505 May 05, 2012   CARMA23 track
Third D array baseline solutions and first baseline solutions for SH array (CARMA23 track at 3mm). Positions relative to C11; good solutions for all antennas. Significant changes to the previous SH solutions for C17, C18, C19, C21, C22. For C18, C19, C22 good solutions could be obtained by taking the phase difference between USB and LSB.
D + SL
antpos.120410 Apr 10, 2012 No new data.
Revert D config baseline solution to antpos.120404. Shift SL config (C16-C23) baseline solution by delX = +0.0214, delY = +0.0224, delZ = -0.0081 nsec from pre-April 4 positions.
D + SL
antpos.120405 Apr 05, 2012   CARMA23 track
Second D array baseline solutions (CARMA23 track at 3mm). Positions relative to C11; good solutions for all antennas. Significant changes (about 1cm) to the previous solutions for all the 3.5m antennas (C16-C23).
D
antpos.120404 April 04, 2012   move to D, CARMA15
First D array baseline solutions (CARMA15 track at 3mm); Positions relative to C8; Significant changes(3-6cms) to the raw solutions for C3, C10, C12 and C15; quality good enough to start with; another track under improved weather conditions to be taken.
C
antpos.120329 Mar 29, 2012   CARMA23 track
Final C array baseline solutions (CARMA23 track at 3mm); Positions relative to C11; no coherence was found on C19 and C20, not enough points for C16, C17, C21 and C23. Significant changes to the previous solutions only for C18 and C22.
C
antpos.120311 Mar 11, 2012   CARMA15 track
Fourth C array baseline solutions; Positions relative to C11; significant changes to the previous solutions only for C1, C4 and C6.
C
antpos.120210 Feb 10, 2012   CARMA15 track
Third C array baseline solutions; Positions relative to C11; solutions have improved the data, but no significant changes to the previous solutions (<0.01 ns).
C
antpos.120114 Jan 14, 2012   CARMA15 (3mm) and SZA (1cm) track
Second C array baseline solutions; this solution includes CARMA15 3mm solutions from Jan 14th and SZA 1cm solutionsfrom Jan 12th. Positions relative to C14 and C16 for sci1 and sci2 respectively.
C
antpos.120112 Jan 12, 2012   CARMA15 (3mm) and SZA (1cm) track
First C array baseline solutions; this solution includes CARMA15 3mm solutions and SZA 1cm solutions concatenated from two separate tracks. Positions relative to C14 and C16 for sci1 and sci2 respectively. Poor solutions for C8,11,12,15.
B
antpos.120102 Jan 02, 2012   CARMA15 (3mm) and SZA (1cm) track
Final B array baseline solutions.; this solution includes CARMA15 3mm solutions and SZA 1cm solutions concatenated from two separate tracks. Positions relative to C6 and C16 for sci1 and sci2 respectively. Significant change in solutions only for C17 and C19 from the previous ultra-short sci2 track.
B
antpos.111221 Dec 21, 2011   SZA (1cm) track
First baseline track for sci2. < 2 hours of data, therefore HA coverage is not great; should improve the present solution with a CARMA23 track; this solution includes first B array sci1 solutions for all moved antennas from Dec 15; positions fit relative to C23.
B
antpos.111215 Dec 15, 2011   Sci1
First Sci1 baseline solution after move to B config.
A
antpos.111213 Dec 13, 2011   CARMA23 track
Final CARMA23 track after the SZA pad offsets for C19 and C20 were updated by Nikolaus. Still no fringes on C20 baselines (even for the paired antenna baseline C5-C20). C16 and C23 out of the array and only partial data for C17. Good solutions for all other antennas to be used for PACS correction relative to C8. C19 (whose pad offsets were updated prior to the track),  and C22 (which had < 2 hrs of data in the previous track)  have significant offsets. x, y, z offsets for C19 (in ns): -0.16, 0.14, -0.02.  C22 offset is significant in x (0.01 ns).
A
antpos.111206 Dec 06, 2011   CARMA23 track
Excellent weather CARMA23 track after the new SZA pad offsets were put into the system (on Dec 02). No fringes on C16, C19, and C20 for all baselines. Good solutions for all other antennas to be used for PACS correction relative to C8. C1, C5, C11 and C15 have significant offsets from the previous value; curiously all 0.01 ns in the x-direction. The PACS SZA antennas C17, C18, C21, C2 and C23 had a roughly constant offset in x, y and z of -0.15,+0.14,-0.01 ns respectively. C22 had data for less than 2 hours, so solutions are based on few sources (but reasonable HA and Dec. coverage).
Steps:
1. Derive solutions for C1,C2,C5,C10 relative to C8 using bee 4-P fit
2. use this group to derive solutions individually for all other sci1 and sci2 antennas
3. sci2 antenna solutions derived using step2 followed several iterations of phase difference and 4-P.
4. using win(9) only in 4-P fit for sci2 antennas reduced the phase noise considerably.
     A
antpos.111123 Nov 23, 2011   sci2 track
Solutions derived for C17. C20 used as reference antenna. The pad offsets were very large. The difference relative to the raw positions off by 1.2m, 12 cm, 0.8m in x, y and z respectively.
I did the following to derive this.
  1. Choose a reasonably bright source with good HA coverage to fit the slopes across bands and solve for the xy position.
  2. Choose a cluster of reasonably bright sources close to 0 dec, fit the slopes across bands and do a 4-parameter fit
  3. Step 3 and Step 4. USB-LSB difference for all sources, followed by 4p. This involved several iterations, flagging, unwrapping etc in bee on all sources. Before and After these solutions were applied for C17 baselines.
    A
antpos.111117 Nov 17, 2011   sci1 track
First complete A array solutions based on three succesive tracks from the first day of the move (15 Nov). C8 used as reference antenna. Summary: used phase slopes across wide bands, phase differences between LSB and USB and finally 4-P bit in bee.
SH+D
antpos.111113 Nov 13, 2011   CARMA23 track
Final D array solutions. C8 used as reference antenna. Final solutions in D array for all antennas except C20. No data for C20. These solutions have improved the data, although changes to the pad offsets from previous solutions are not large.
SH+D
antpos.111007 Oct 07, 2011   CARMA23 track
Solutions derived relative to C8. Flagged first half of the data with poor atmosphere and data at elevations < 30 deg. No data for C1 and C16.   Offset from previous solution atmost 1mm. Curiously  0.5 - 1mm x and z offset seen for all SZA antennas.
SH+D
antpos.110903 Sep 03, 2011   CARMA23 track
Second baseline track. Solutions derived relative to C8. Offsets from previous solutions < 0.4 mm. Flagged data at elevations < 30 deg.
SH+D
antpos.110826 Aug 26, 2011   CARMA23 track
First baseline track after move to D. Solutions derived relative to C8. Flagged data at elevations < 30 deg. We have good solutions for all antennas. C6, C11 and C15 had large offsets (3 -- 6 cms).
SL+E
antpos.110818 Aug 18, 2011   CARMA23 track
The previous solutions were good to start with, so these solutions have marginally improved the data for all antennas. This is likely the last solutions for E array. Users encouraged to use this solutions for their dat set.
SL
antpos.110803 Aug 03, 2011   cm SZA track
Improved solutions for C17. C19 out of the array. Refined solutions for all other SZA antennas. The previous solutions (from July 21) were not updated in the system. Note that this is also the SH configuration although the antennas haven't been moved.
E+SL
antpos.110721 July 21, 2011   Second CARMA23 track
Improved solutions for C18. No fringes on C17 and C19 baselines and C23 out of the array. Refined solutions for all other SZA antennas. These solutions have significantly improved the data for C18 and should be used by SZA users.
E
antpos.110714 July 14, 2011   E array track with data on C10 after having zeroed the pad offsets
First solutions for C10. The raw offsets for C10 were off ~8cms (as reported by uvedit in miriad) relative to C8. The observers zeroed the pad offsets for C10 on 14 July 2011 before running the track from which the current solutions were derived. These solutions have significantly improved the data and should be used by users.
E+SL
antpos.110710 July 10, 2011 E  & SL
Refined solutions for CARMA and SZA antennas with C8 as the reference. These solutions should be used for all tracks taken since the move to E. No fringes seen on baselines with C17. Failed to derive good solutions for C10. Solutions for C17 and C23 to be improved.
E
antpos.110709 July 09, 2011 First E array
Solutions derived for all CARMA antennas except C10. C8 is the reference. Phase slopes were fitted followed by iterative 4-parameter fit to derive the final solutions. Good solutions.
D antpos.110706 July 06, 2011 Final D array (SZA not included)
Track was taken in CARMA 15 mode. C6 out of the array. It appears that the previous solutions (from 08 June) were not put into the system. Good solutions for all.
D+SL antpos.110608 June 08, 2011 CARMA23
Baseline solutions derived in CARMA23 mode. Solutions have improved data for all. But position offsets have changed by <0.01 ns.
D+SL antpos.110511 May 11, 2011 CARMA23 mode baseline solutions
Baseline solutions derived for all except C11 in CARMA23 mode. CARMA antennas have moved by ~0.7 ns relative to C8, and SZA antennas by ~0.12 ns. Solutions have improved data for all. If you find incoherence in your data set after applying these solutions, please remove the comments (first line) from the antpos file. This is because the line does not wrap properly.
C+SL antpos.110416 April 16, 2011 CARMA23 mode baseline solutions
Baseline solutions derived for all except C21 in CARMA23 mode after changing the North padOffset values by 200mm for all antennas, i.e. new_offset=old_offset+200mm. No data for C21 due to a Cal. Tertiary issue. C22 has moved by 0.34 ns relative to C8, and solutions for all others have improved.
C+SL
antpos.110414 April 14, 2011 First C array solutions
First solutions from the baseline track after the move to C was complete. Reference antenna is C8. All moved antennas show a ~0.7 ns offset relative to C8 (direction North).  C8 is on pad 32 which is our reference antenna (had zero pad offsets).  Later on, Steve Miller measured and reported that C8 is set down 0.76 ns North of its nominal position.
D+SL antpos.110408 April 08, 2011 Second SZA baseline solutions in SL array
SZA baseline solutions for all except C22 after the move was complete. C21 moved by ~3cms relative to reference antenna C20. Good solutions for all (except C22).  There appears to be a large pointing error on C22 (more than a beam).
D+SL antpos.110330 Mar 30, 2011 First SZA baseline solutions in SL array
SZA baseline solutions on the first day of the move. C18, C19 and C22 have been moved. Derived solutions are for these antennas relative to C16. C22 moved by ~ 5 cms.
DZ antpos.110315 Mar 15, 2011 First solutions for C11 and SZA Solutions for derived C11, and C16 -- C23.  Flagged data at elevation < 30 deg. Phase slope fitting followed by LSB-USB method and finally 4-parameter fit. C11, C18 and C19 moved by 22, 14 and 11 cms respectively (relative to C8). I assume this is because of receiver moves. We now have good solutions for all antennas in DZ.
DZ antpos.110309 Mar 09, 2011 First solutions for C1-C15 (excluding C11). No SZA first track after the move with only sci1 antennas. No fringes on C11 baselines, therefore no solutions for C11 yet. C8 used as reference antenna. Phase slope fitting followed by LSB-USB method and finally 4-parameter fit.
EZ (Carma 23 E) antpos.110307 Mar 07, 2011 Final solutions for CARMA 23 in E array First and only solution for C20. ~15 cms change for C20 relative to reference antenna C1. Only band 9 data has been used. Data affected by shadowing flagged. C23 baselines show large amplitude drops with HA, likley large pointing errors.
EZ (Carma 23 E) antpos.110211 Feb 11, 2011 First solutions for CARMA 23 in E array This is the first (ever) solutions for all antennas in the CARMA 2 array configuration. Good solutions derived for all, except C20. No fringes on C20 baselines. miriad antenna position update reports ~14 cms change for all SZA antennas relative to reference antenna C1. Final solutions derived by fitting phase slopes and 4 parameter fit in bee. Data with C20 baselines, and all bands except band 9 were flagged. Here are before and after plots for a subset of the baselines.
E antpos.110120 Jan 20, 2011 Solution for E array after move was complete Significant changes from the intial solution for C7, C8, C9, C10, C11, C13 and C15. C8 and C10 moved by ~18 cms and 12 cms relative to reference antenna C1. Final solutions derived by fitting phase slopes and 4 parameter fit in bee. Data with unusual gains (3c345 and 0730-116) had to be flagged.
E antpos.110115 Jan 18, 2011 Sci1 baseline solution for E array Solutions for C12 and C14. Move to E is not yet complete. A more updated solution for all antennas should follow once a full baseline track is taken. C12 and C14 moved by ~3.6 cms and 1.8 cms relative to reference antenna C1 (derived by fitting phase slope).
B antpos.sza.101224 Dec 24, 2010 First (only?) Sci2 baseline data for B array This solution from Mel. Summary: used average slope across 500 MHz bands. Antennas 16, 17, 19, 21 move by ~ 0.6 ns; others OK, relative to refant = 21
B antpos.101224 Dec 24, 2010 First (only?) Sci1 baseline data for B array This solution from Nikolaus (non-expert), not Thushara (expert). C9 used as reference antenna. Here are before and after plots for a subset of the baselines.
A antpos.pacs.101213 Dec 13, 2010 First PACS track in A array C2/C21 were the reference antenna. The sci1 solutions were based on pacs correction (except for 1 which did not have C17), and sci2 is just a normal track (pacs track from Dec 01). Reverse pacs did not work because of phase shifts caused in gpbuddy.  C17 of course remains unchanged because C17 is out of the array. It is unclear whether this solution was ever applied to the system because this was derived by me (Thushara, who was away for a month), but was to be tested by PIs before applying it the system at CARMA. PIs, please contact Thushara if they have questions about this solution.
A antpos.sza.101124 Nov 24, 2010 First PACS track in A array C16 used as reference antenna (tried using C20, but failed to give good solutions), C17 out of the array. The changes to the initial solution are in the range 0.4 -- 3.0 cms (as reported by uvedit in miriad). The new solutions have significantly improved the data (see before and after plots).
A antpos.101124 Nov 24, 2010 First A track C8 reference antenna; The new solutions have significantly improved the data (see before and after plots), but are still preliminary for few antennas (C7 for e.g.) and needs to be refined with a new track. An xy only fit for a single target (wierdly) failed, and these solutions were based on iterations of phase slope and phase difference between LSB and USB on all sources.
C antpos.sza.101112 Nov 12, 2010 Final track C20 used as reference antenna, C17 out of the array. No significant changes from previous solutions as seen here.
C antpos.101112 Nov 12, 2010 Final track C8 reference antenna; C9 and C11 changed by ~+0.4mm in "x" offsets relative to Oct 09 solutions as seen here.
C antpos.sza.101009 Oct 09, 2010 second track? C20 used as reference antenna, improved solutions for all.
C antpos.101009 Oct 09, 2010 Second track C8 used as reference antenna; ~ 5 hours of good weather data; improved the initial solutions with only C5 showing >0.6 mm offsets from previous position.
C antpos.100922 Sep 22, 2010 First C track C8 used as reference antenna; satisfactory initial solutions for all antennas based on phase difference followed by 4-parameter fit method; solutions can be improved later on based on a better weather track.
D antpos.100919 Sep 19, 2010 Final baseline track C8 used as reference antenna. The previous solutions were not updated into the system. Changes from Aug 1 solutions however are < 0.4mm.
D antpos.100906 Sep 6, 2010 Third baseline track C8 used as reference antenna. C10 data is noisy. Changes to antenna positions is < 0.4mm as seen here.
D antpos.100803 Aug 3, 2010 Second baseline track C8 used as reference antenna. Track taken after setting the (large) delay offsets. Baseline solutions have been significantly improved.
D antpos.100801 Aug 1, 2010 First track (for which solutions have been derived) C8 used as reference antenna. Initial solutions for all antennas. Solutions for C3, C5 and C10 are significantly off (> 7 cms) from the initial offsets.
SH antpos.Sci2.100728 July 28, 2010 Final SH-config Best(?) baseline solution after switch to DSS.
E antpos.100727 July 27, 2010 Final track C9 used as reference antenna. No significant changes from the previous solution.
E antpos.100708 July 8, 2010 Second track C9 used as reference antenna. These are the first solutions for C6 (and moved by ~ 2.3 cms). The solutions have been improved for all other antennas, particularly those that were significantly off from the initial pad offsets.
E antpos.100702 July 2, 2010 First E-array baseline track C9 used as reference antenna. No data for C6. Solutions for C1 and C5 have been derived from an earlier very short baseline track and needs improvement. Good solutions for the rest of the array. The initial pad offsets off by ~ 4--6 cms for three antennas.
hybrid antpos.100609 June 9, 2010 Third baseline track C1 used as reference antenna. C10 baseline problem has been tracked down to a pointing issue. These are the first good solutions for C10. The initial pad offsets for C10 were off by ~ 7 cms!!
hybrid antpos.100606 June 6, 2010 Second baseline track C1 used as reference antenna. Flagged out some bad C17 & C22 data (issues with tertiary). These are the first solutions for C7. Refined solutions for all others except C10, which still has significant errors.
hybrid antpos.100604 June 4, 2010 first fit for cm run fit C1,C6,C8,C10,C13,C16-23 vs C14; C14 and all other antennas copied from antpos.100501; C7 not locked; C10 highly questionable; phase jump on C18
D antpos.100530 May 30, 2010; Final D-array track. D-config C8 used as reference antenna. No significant changes from previous solution (< 0.4mm).
D antpos.100501 May 1, 2010; Second D-array baseline track. D-config C8 used as reference antenna. Users with 2010 D-array data starting from 1 May until the next baseline update SHOULD use this solution.
D antpos.100413 April 13, 2010; First D-array baseline track. D-config C8 used as reference antenna. After flagging the first half of the track with noisy data, the initial solutions were derived using phase-slope method and the 4-parameter fit in bee. Please note that the initial solutions were in error by ~ lambdas!!! Therefore, it is important that PIs who have data taken in D-array before 01 May 2010 use this solution.
C antpos.100402 April 02, 2010; Final C-array track. C-config C11 used as reference antenna. The corrections to all antenna positions except C4 and C6 are small as shown here . C4 and C6 solutions have improved the data.
C antpos.100314 Mar 14, 2010; Second C-array track. C-config C11 used as reference antenna. The first half of the data was taken under 200 -350 mu rms and the phase scatter is > 0.5 radian. The corrections to all antenna positions are small as shown here .
C antpos.100301 Mar 01, 2010; First C-array track. C-config C11 used as reference antenna. I used the slope method to get initial baseline solutions, which was then refined by applying to the raw data and re-deriving baseline solutions in bee (see before and after plots). The corrections to all antenna positions are significant (few cms!) as shown here .
A antpos.100214 Feb 14, 2010; Third (and probably final) A-array track. A-config C13 used as refant. Given that C4 was not in the array for the last baseline track, these are the first solutions for C4 (see before and after plots).
A antpos.10015 Jan 15, 2010; Second A-array track on the same night. A-config Very good weather conditions through out the track. C13 used as refant. C4 not in the array (see before and after plots). As shown in the plots, these baseline solutions have significantly improved the data.
A antpos.100114 Jan 14, 2010; First A-array track A-config Good weather conditions during the track. C13 used as refant. C4 not in the array (see before and after plots)
B antpos.100105 Jan 5, 2010 -- end of B-array B-config Good weather conditions during the track. C1 used as refant. C2, C3, C4, C5, C8 seem to have drifted by more than 0.4 mm compared to Dec 10, 2009 solutions (see comparison plot).
B antpos.091210 Dec 10,2009 B-config C1 used as refant. C8 has significantly drifted compared to Dec 4, 2009 solutions (see comparison plot).
B antpos.sza.100105 Jan 5, 2010 SZA solutions derived by Vernesa Good weather conditions during the track. C17 used as refant.
B antpos.091204 Dec 4, 2009 -- Jan 5, 2010 second B-config solution w/ all antennas Obtained good solutions for all antennas. Baseline solutions for Dec03 vs Dec04 is shown here. Phase vs time plots before and after the solutions have been applied.
B antpos.091203 Dec 3, 2009 -- start of B-configuration first B-config solution w/ all antennas Good enough to start science tracks, but I am still not satisfied with their accuracy (there is a lot of phase scatter in the fits; up to 0.9 radians, compared to 0.2-0.4 for good solutions; formal accuracy is better than 0.15mm).
SL antpos.sza.091129 Nov 29, 2009 -- end of SL-configuration final SL-config solution Seven hours of data. Run in PACS mode, so CARMA and SZA antennas were observing the same sources at the same times. SZA solutions were derived using MIRIAD's bee task. From Vernesa: "It's incredible how samll the phase scatter is in the fits (<0.1rad)."
C antpos.091129 Nov 29, 2009 -- end of C-configuration final C-config solution Seven hours of data. Run in PACS mode, so CARMA and SZA antennas were observing the same sources at the same times. There is > 0.4mm difference in the x position values for C8 and C9 as shown here.
C antpos.091025 Oct 25, 2009 -- start of configuration first proper C-config solution Solutions derived for all antennas.
C antpos.091010 Oct 10, 2009 -- start of configuration first C-config solution C3 behaved the worst (and we need to refine its solutions). C6, C11 were out, and C8 was used as refant. The solutions are good to start science tracks, but we need another track as soon as possible to refine the solutions.
D antpos.090903 Sep 03, 2009 -- end of configuration third D-config solution C8 used as refant. No major change compared to previous solutions; see here.
D antpos.090808 Aug 08, 2009 -- Sep 03, 2009 second D-config solution C12 used as refant; good solutions. Formal uncertainty is better than 0.15 mm; average scatter of the 4-parameter fits is about 0.2 rad. Phase vs. time plots before and after the solutions have been applied. Positions, compared to previous solutions, are here.
D antpos.090723 July 23, 2009 -- Aug 08, 2009 first D-config solution C12 used as refant; good solutions. Formal uncertainty is better than 0.22 mm; average scatter of the 4-parameter fits is about 0.2-0.3 rad. Phase vs. time plots before and after the solutions have been applied.
E antpos.090713 July 13, 2009 -- July 23, 2009 E-config solution C3 out of the array, C8 used as refant. C1, C2, and C4 have moved slightly more than 0.4mm compared to previous slolution in y, z, and x/z, respectively. C6 has significantly moved (~0.9mm in x; see comparisson plot) likely due to change of azimuth thrust rollers on this antenna. Phase vs. time plots before and after the solutions have been applied.
E antpos.090613 June 13, 2009 -- July 13, 2009 E-config solution Data reduced while in Japan! First E-config solution including C2.
C antpos.090414 Apr. 14, 2009 -- June 6, 2009 C-config solution refant=C8. Vernesa used an iterative process: "First the slope-500MHz method reaches a ~6cm accuracy. Then taking the upper/lower sidebands separately yields a ~0.5 cm accuracy. Finally applying these solutions to the initial data set resulted in the attached positions." Here are phase vs. time plots before and after the solutions have been applied. "The formal uncertainties on the (x,y,z) positions are better than 0.1mm. However, the phase scatter of the fit is larger than in optimal conditions [mean~0.4 radian (usually 0.2-0.3), reaching up to >0.6rad for C1, C2, C4], so another track would be useful."
D antpos.090331 Mar. 31, 2009 -- Apr. 9, 2009 D-config solution C8 used as refant. C1,2,4,5,6 moved in y more than 0.4mm (see comparison with previous solutions here) Phase vs. time after baseline correction is applied can be found in PhaseTime.BS.090331.pdf
D antpos.090225 Feb. 25, 2009 -- Mar. 31, 2009 D-config solution Good solution for C3. Phase vs. time after baseline correction is applied can be found in (PhaseTime.BS.090225.pdf)
D antpos.090221 Feb. 21, 2009 -- Feb. 25, 2009 First D-config solution C3 still on A-config pad. Solution derived by Dick Plambeck.
A antpos.090131 Jan. 31, 2009 -- ... Improved A-array solutions C2 used as refant. Accuracy within ~1mm, compared to antpos.090127 (compare.090131.pdf). Phase vs. time after baseline correction is shown in (PhaseTime.BS.090131.pdf).
A antpos.090127 Jan. 05, 2009 -- Jan. 31, 2009 First PROPER A-array solution Solutions consistent with those below for C1-9, 11, 12, 14, 15. Significant improvement for C10 & C13.
A antpos.090119 see above First A-array solution C2 used as reference antenna. Solutions good to ~1mm, or better. C10/10 tricky. Phase rms scatter can be seen here (refant excluded). Phase vs. time after baseline corrections have been applied can be found here (13MB). For reference, a phase. vs. time plot before baseline solution correction were applied can be found here (13MB).
B antpos.081221 Dec. 21 2008 -- Jan. 04 2009 Second B-array solution C13 used as reference antenna. C5 has moved >0.4mm. Changes compared to antpos.081121 can be seen here
B antpos.081122 Nov. 21 2008 -- Dec. 21, 2008 Initial B-array solution C13 (only antenna that has not been moved) used as reference antenna.
C antpos.081024 Oct. 24 2008 -- Nov. 21 2008 Second C-array solution C8 used as reference antenna. First solution for C4; some antennas have moved >0.4mm. Changes compared to antpos.081012 can be seen here
C antpos.081012 Oct. 11 2008 -- Oct. 24 2008 First C-array solution (based on 2 baseline tracks) C1, C4 out; C8 used as reference antenna. New solutions will be derived in ~2 weeks.
E antpos.081008 Oct. 08 2008 -- end of E-array Second E-array solution All antennas present; C10 used as reference antenna. These solutions confirm the previous E-array solutions; no major changes. The x,y,z position changes, compared to previous solutions (antpos.080912), can be seen here
E antpos.080912 Sep. 12 2008 -- Oct. 08 2008 Use for E-array tracks; > Sep/12/2008
D antpos.080827 Aug. 27 2008 -- Sep. 12 2008 No major (>0.4mm) changes compared to Jul. 23 solutions. Use for tracks run after Aug/26/2008 C3 was out of the array, C13 did not lock, refant=C11. Maximum position change (compared to antpos.080723) is 0.3 mm (C12), median position change of all antennas is ~0.03 mm with a 1 sigma spread of 0.1 mm.
D antpos.080723 Jul. 23 2008 -- Aug. 26 2008 No major changes compared to Jun. 06 solutions. Use for tracks run after July/22/2008
D antpos.080606 Jun. 06, 2008 -- Jul. 22 2008 Final for the move to D-array; use for tracks run after June/05/2008
C antpos.080518 May. 18 -- Jun. 05, 2008 Final
C antpos.080414 Apr. 14 -- May. 17, 2008 Final
D antpos.080313 Mar. 9 -- Apr. 13, 2008
C1 moved a bit.
D antpos.080228 Feb. 22, 2008- Mar. 8, 2008 Final Good solution after move
B antpos.080218 Feb. 1, 2008-Feb. 17, 2008 Final
B antpos.080115 Jan. 5, 2008-Feb. 1, 2008 Final Pads moved after snow (Jan.4-5).
B antpos.071121 Nov. 15, 2007- Jan. 5, 2008 Final
C antpos.071109 Oct. 26, 2007-Nov. 12, 2007 Final Good solution with error ~0.2mm.
C antpos.071014 Oct. 07, 2007-Oct. 25, 2007 Final Small changes from previous solution. C1&6 have largest errors.
C antpos.070916 Sep. 08, 2007-Oct. 07, 2007 Final Solution after move
E antpos.070908 Aug. 25, 2007-Sep. 11, 2007 Final C5,10,12,13,14,15 moved by 0.2-0.3mm from previous sol.
E antpos.070808 Aug. 9, 2007-Aug. 24, 2007 Final Good solution after move
D antpos.070625 Jun. 25, 2007-Aug. 9, 2007 Final
D antpos.070613 Jun. 13 (noon), 2007-Jun. 25, 2007 Final C8 moved slightly (~0.3mm)
D antpos.070509 Apr. 30 (noon), 2007-Jun. 13 (noon), 2007 Final
D antpos.070411 Apr. 9 (noon), 2007-Apr. 30 (noon), 2007 Final C4,11 moved
C->D antpos.070406 Apr. 6-9 (noon), 2007 Final C1,2,5,15 moved
C->D antpos.070405 Apr. 5-6 (noon), 2007 Final C7,8,13,14 moved
C antpos.070322 Mar. 5- Apr. 5, 2007 Final Good solution
C antpos.070220 Feb. 15, 2007 - Mar. 5, 2007 Final antpos.070115 is still ok, but C11 shifted slightly
C antpos.070115 Jan. 9, 2007 - Feb. 15, 2007 Final C2, 4, 5 moved

Since Jan 15 2010: Thushara Pillai "tpillai @ astro.caltech.edu"