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operations:pointing

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operations:pointing [2013/02/13 22:55]
Jim Lovell 		operations:pointing [2017/05/30 07:12] (current)
Jamie McCallum [Version 2016.135]
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 ==== Obtaining a pointing model with the PCFS ==== ==== Obtaining a pointing model with the PCFS ====
 +It's a good idea to allow about 24h of observing to obtain a new pointing solution. Then some additional time is required (a few hours) to confirm that the new solution is working.
  
 +  - Start up the field system software as usual and make sure the DBBC is set up in a standard R1/R4 configuration. ​
 +  - It's probably worth using eRemoteControl for this too and setting up the log monitor so you will be alerted if there'​s a problem.
 +  - The pointing routine will append (or make) a log file called ''/​usr2/​log/​sx.log''​ which is later used to make a pointing solution. If this file already exists, consider renaming it so there'​s a fresh one for the new solution.
 +  - Then, in the field system: <​code>​proc=point
 +initp
 +acquire</​code>​
 +  - The Field System will then automatically choose a pointing source and determine an offset. It will continue to do this indefinitely for a range of sources. Let it run for 24h.
  
 +=== During the pointing run ===
  
 +Lots of messages are produced from the fivpt (pointing) routine. It's worth watching the output (initially anyway) to check it's making sense:
 +  * [[operations:​documentation:​fivept_output|What does the fivpt output mean?]]
 +  * [[operations:​documentation:​pointing_monitoring|Monitoring and plotting pointing data]] during a pointing run
 +
 +=== Ending a pointing run ===
 +
 +When you think you have enough data, stop the pointing run in the field system by killing the pointing routines, zeroing the pointing offsets and send the antenna to stow:
 +<​code>​kill
 +azeloff=0d,​0d
 +source=stow
 +</​code>​
 +
 +=== Finding a pointing solution ===
 +
 +Open a terminal on the Field System (make sure X11 is being forwarded) then start up the pointing solution GUI:
 +<​code>​pdplt &</​code>​
 +Load the log file with ''​File -> New''​. To cycle through the plots use the ''​Graph''​ menu or ''​n''​ and ''​p''​. By default the fit residuals are shown but you can also plot the raw data under the ''​Data''​ menu. Obviously bad data can be flagged by clicking on points. To remove outliers automatically,​ try the ''​Edit -> x-sigma''​ option to remove points more than a specified number of sigma out. After flagging points, you can use the ''​Edit -> Reprocess''​ option to re-fit the data. If necessary, do some more flagging and reprocess. ​
 +
 +The ''​Edit -> Modify Parameters''​ option lets you control how and which parameters are used. The default (params 1 through 8 and number 23 set to 1, the rest 0) seems to work well. Note that parameters 15, 16, 17 and 18 (frequency 2 tilt) have been used at the GSFC 12m to improve the solution. However, it's worth producing a solution using the default parameters too because this can be copied to the controller (which doesn'​t support the other parameters).
 +
 +The ''​Statistics''​ menu shows you how good the fit is.
 +
 +When you are satisfied with the pointing solution:
 +<​code>​ File -> Save </​code>​
 +This will save two new files in ''/​usr2/​log''​. The ''​xtr''​ file contains the data which can be re-loaded and reduced if necessary. The ''​err''​ file contains the new model: look for ''​new_model''​ in the file.
 +
 +=== Updating the pointing model ===
 +To update the pointing model (which will go into ''/​usr2/​control/​mdlpo.ctl''​) use the ''​update''​ command. If the new model is called err2013.043,​ type
 +<​code>​update 2013.043</​code>​
 +Then check the new file to see if it's been updated.
 +
 +To copy the model into the controller, use HMI
 ==== Obtaining a pointing model with the Power Sensor ==== ==== Obtaining a pointing model with the Power Sensor ====
  
Line 19: Line 60:
  
 ===== Hobart 12m model ===== ===== Hobart 12m model =====
 +
 +==== Version 2016.135 ====
 +
 +Taken following the installation of the new cable wrap.
 +
 +Newly derived coefficients:​
 +<​code>​
 +  00008  2017  135  00  53  37 0
 +   ​90.0000 ​ 1 1 1 1 1  1 1 1 0 0  0 0 0 0 0  0 0 0 0 0  0 0 1 0 0  0 0 0 0 0
 +  -0.7106876969 ​  ​0.0000000000 ​  ​0.0228546374 ​  ​0.0497939363 ​  ​0.0030318052 ​
 +  -0.0002992165 ​  ​0.1175717711 ​  ​0.0146358637 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0019028779 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +</​code>​
 +
 +The HMI controller was updated 30/05/17
 +
 +
 +^ FS Coeff ^ HMI Coef ^ New FS model ^
 +| P1  | G2| -0.7107 |
 +| P3  | G3| 0.0229 |
 +| P4  | -G1| 0.0498 |
 +| P5  | G5| 0.0030 |
 +| P6  | -G4| -0.0003 |
 +| P7  | G7| 0.1176 |
 +| P8  | G8| 0.0146 |
 +| P23 | G9| 0.0019 |
 +
 +^ HMI Coef ^ Value ^
 +| G1 | -0.0498 |
 +| G2 | -0.7107 |
 +| G3 | 0.0229 |
 +| G4 | 0.0003 |
 +| G5 | 0.0030 |
 +| G6 | not used |
 +| G7 | 0.1176 |
 +| G8 | 0.0146 |
 +| G9 | 0.0019 |
 +==== Version 2016.235 ====
 +
 +Taken following re-installation of S/X feed and movement of subreflector to original position.
 +
 +Newly derived coefficients:​
 +<​code>​
 +  00007  2016  235  23  14  09 0
 +   ​90.0000 ​ 1 1 1 1 1  1 1 1 0 0  0 0 0 0 0  0 0 0 0 0  0 0 1 0 0  0 0 0 0 0
 +  -0.4333212972 ​  ​0.0000000000 ​  ​0.0158737078 ​  ​0.0405583084 ​  ​0.0002418841 ​
 +   ​0.0006486370 ​  ​0.1193821207 ​  ​0.0167687163 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0006459429 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +</​code>​
 +
 +^ FS Coeff ^ HMI Coef ^ New FS model ^
 +| P1  | G2| -0.4333 |
 +| P3  | G3| 0.0159 |
 +| P4  | -G1| 0.0406 |
 +| P5  | G5| 0.0002 |
 +| P6  | -G4| 0.0006 |
 +| P7  | G7| 0.1194 |
 +| P8  | G8| 0.0168 |
 +| P23 | G9| 0.0006 |
 +
 +^ HMI Coef ^ Value ^
 +| G1 | -0.0406 |
 +| G2 | -0.4333 |
 +| G3 | 0.0159 |
 +| G4 | -0.0006 |
 +| G5 | 0.0002 |
 +| G6 | not used |
 +| G7 | 0.1194 |
 +| G8 | 0.0168 |
 +| G9 | 0.0006 |
 +
 +Field system and HMI have been updated
 +
 +==== Temporary HMI model ====
 +This is a temporary model applied in HMI during broadband tests with the Callisto system. ​
 +
 +Original model:
 +<​code>​
 +P1 -0.0335
 +P2 -0.4380
 +P3 0.0066
 +P4 -0.0026
 +P5 -0.0023
 +P6 0
 +P7 0.1538
 +P8 0.0214
 +P9 0.0026
 +</​code>​
 +
 +Additional offsets are 
 +<​code>​
 +Az = +2.7 arcmin = 0.045 deg
 +El = -4.0 arcmin = -0.0667 deg
 +</​code>​
 +
 +The DC terms in the pointing model are P2 (Az) and P7 (El), so new model is:
 +<​code>​
 +P1 -0.0335
 +P2 -0.393
 +P3 0.0066
 +P4 -0.0026
 +P5 -0.0023
 +P6 0
 +P7 0.08713
 +P8 0.0214
 +P9 0.0026
 +</​code>​
 +
 +
 +
 +==== Version 2016.151 ====
 +2 June 2016
 +
 +Observations over 24he. Little change to rms before and after
 +
 +<​code>​
 +Data:
 +xEl mean -0.0013
 +xEl RMS 0.007
 +El mean -0.015
 +El RMS 0.008
 +
 +After solution:
 +xEl RMS 0.007
 +El RMS 0.009
 +</​code>​
 +
 +Solutions applied err2016.151
 +
 +{{:​operations:​opsmac1.png?​200|}}
 +
 +
 +
 +==== Version 4.2 ====
 +
 +Model updated from observations taken over a few days around 2014/205. Slight dependance on Elevation offset with Azimuth removed. Otherwise looks good.
 +
 +==== Version 4.1 ====
 +
 +Slight offset in elevation. Model updated from observations on 2013/323
 +
 +==== Version 4.0 ====
 +
 +Taken using PCFS on 2013 day 043/044. Coefficients used during pointing:
 +
 +<​code>​
 +*  0 0 0 0 0 0 0
 +*   ​90.0 ​  1 1 1 1 1  1 1 1 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0 1
 +*  -0.4263 0.0 0.0048 0.0363 -0.0004
 +*  -0.0026 0.1906 0.0250 0.0 0.0
 +*  0.0 0.0 0.0 0.0 0.0
 +*  0.0 0.0 0.0 0.0 0.0
 +*  0.0 0.0 0.0 0.0 0.0
 +*  0.0 0.0 -0.0014
 +</​code>​
 +
 +Newly derived coefficients:​
 +<​code>​
 +  00002  2013  044  23  30  55 0
 +   ​90.0000 ​ 1 1 1 1 1  1 1 1 0 0  0 0 0 0 0  0 0 0 0 0  0 0 1 0 0  0 0 0 0 0
 +  -0.4380196333 ​  ​0.0000000000 ​  ​0.0065650782 ​  ​0.0334785432 ​ -0.0023106572 ​
 +   ​0.0025938717 ​  ​0.1538095325 ​  ​0.0214055236 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0025560106 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +   ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​  ​0.0000000000 ​
 +</​code>​
 +
 +In HMI these are translated to:
 +
 +^ Coeff ^ Old model ^ New model ^
 +| P1 | -0.0363 | -0.0335 |
 +| P2 | -0.4263 | -0.4380 |
 +| P3 | 0.0048 ​ | 0.0066 |
 +| P4 | -0.0026 | -0.0026 |
 +| P5 | -0.0004 | -0.0023 |
 +| P6 | not used ||
 +| P7 | 0.1906 ​ | 0.1538 ​ |
 +| P8 | 0.0250 ​ | 0.0214 ​ |
 +| P9 | -0.0014 | 0.00255 |
 +
 +Field system and HMI have been updated
 ==== Version 3.4 ==== ==== Version 3.4 ====
 30 June 2011\\ 30 June 2011\\
Line 32: Line 261:
 P8 = 0.0000\\ P8 = 0.0000\\
 P9 = 0.0029\\ P9 = 0.0029\\
- 
 ==== Version 3.3 ==== ==== Version 3.3 ====
 17 Feb 2011\\ 17 Feb 2011\\
Line 165: Line 393:
  
 ===== Katherine 12m model ===== ===== Katherine 12m model =====
 +==== Version 2016.151 ====
 +
 +Observations over 24h following recent maser maintenance. Little change to rms before and after
 +
 +<​code>​
 +Data:
 +xEl mean 0.0027
 +xEl RMS 0.007
 +El mean -0.0118
 +El RMS 0.0118
 +
 +After solution:
 +xEl RMS 0.0126
 +El RMS 0.013
 +</​code>​
 +
 +Solutions applied err2016.151
 +
 +{{:​operations:​ke_pointing_2016_151.png?​200|}}
 +
  
 ==== Version 1.0 ==== ==== Version 1.0 ====
Line 212: Line 460:
  
 ===== Yarragadee 12m model ===== ===== Yarragadee 12m model =====
 +
 +==== Version 2016.151 ====
 +
 +Observations over 24h following recent maser maintenance. Little change to rms before and after
 +
 +<​code>​
 +Data:
 +xEl mean -0.0006
 +xEl RMS 0.011
 +El mean 0.015
 +El RMS 0.008
 +
 +After solution:
 +xEl RMS 0.012
 +El RMS 0.010
 +</​code>​
 +
 +Solutions applied err2016.151
 +
 +{{:​operations:​yg_pointing_2016_151.png?​200|}}
 +
 +This solution was put into HMI on 22 June 2016, ~23:45 UT (day 174). Parameters are:
 +
 +<​code>​
 +G1 -0.0105
 +G2 -0.0070
 +G3  0.0180
 +G4  0.0094
 +G5 -0.0024
 +G7  0.2059
 +G8  0.0158
 +G9  0.0007
 +</​code>​
 +
 +Note that these were initially put in to HMI on June 20 but the sign for G4 was wrong. Not sure if that had a significant impact or not.
 +
 +Also updated HMI (on day 175, 00 UT) with revised station coordinates. Only sig change was to elevation which was 50m too low.
 +
 +<​code>​
 +Lat, Long, Elevation:
 +Before: -29.0465, 115.3467, 200.0
 +After: -29.0469, 115.3465, 250.48
 +</​code>​
 +
 +
 +
 ==== Version 1.5 ==== ==== Version 1.5 ====
  
/home/www/auscope/opswiki/data/attic/operations/pointing.1360796102.txt.gz · Last modified: 2013/02/13 22:55 (external edit)

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