CARMA Baseline Solutions

Applying Baseline

Baseline Solutions

configuration solution Start/End status Notes
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
ENG->C antpos.070108 Jan. 8-9, 2007 Final C14 moved
ENG->C antpos.070105 Jan. 5-8, 2007 Final C15 moved
ENG->C antpos.070104
axoff.comb.060914.minus
axoff.comb.070101 		Jan. 4-5, 2007 Final C8, 11 moved
Apply both axoff.comb.060914.minus and axoff.comb.070101
ENG->C antpos.070103
axoff.comb.060914.minus
axoff.comb.070101 		Jan. 3-4, 2007 Final C7 moved
Apply both axoff.comb.060914.minus and axoff.comb.070101
ENG antpos.061220
axoff.comb.060914.minus
axoff.comb.070101 		Dec. 20, 2006 - Jan. 3, 2007 Final C1 moved
Remove C5 for Dec. 12-25
Apply both axoff.comb.060914.minus and axoff.comb.070101
ENG antpos.061012
axoff.comb.060914.minus
axoff.comb.070101 		Nov. 11, 2006 - Dec. 20, 2006 Final Remove C5 for Dec. 12-25
Apply both axoff.comb.060914.minus and axoff.comb.070101
ENG antpos.061012
axoff.comb.070101 		- Nov. 10, 2006 Final
Since Jan 15 2010: Thushara Pillai "tpillai @ astro.caltech.edu"