DV05 Pointing System Issues and Tracking


TIP Last Update: JeffMangum - 23 November 2009

Issues Tracked

Resolved issues indicated with strike through.

  • VERTEX-316: DV05 Acceptance Tests - Pointing
    • Ticket for tracking all-sky pointing, offset pointing, and fast switching verification tests.
  • AIV-1604: Antenna #5 AIV - DV05 - OPT Verification
    • 2009-11-23: Having trouble with offset pointing verification. Lots of poor results.
      • Note offsets (of single stars in the trio usually) and drifts which mainly occur in azimuth.
      • Tracked a single trio for five iterations of the offset pointing script to look for (Az,El) dependence to offsets and drifts. No apparent dependence on (Az,El) noted.
  • Periodic Jump in Elevation Position Every 60 Seconds
    • 2009-10-02
      • Noted during seeing measurements (otherwise would not have noted a position jump with a 60 second periodicity. See the attached plot: DV0520091002PositionSeeing-1.png.
      • Looking at actual command and response commands, appears that the ACU position is drifting for about 5 seconds or so relative to the command position. See the attached plot: DV0520091002PositionSeeingPos-1.png.
      • Seeing run associated with the "Offset2" measurement did not show this periodicity, though it did show a single position jump.
      • Concern here is that this is problem with the tracking ability of the ACU over longer timescales than we have measured before. Would be useful to make some several-minute tracking observations (equivalently long seeing measurements) to further diagnose this problem.
      • 2009-10-03
        • Seeing measurements made today do not show periodic position jumps noted on 2009-10-02.

Test Matrix Progress Tracking

All-Sky Pointing

(todo - todo done - done )

 +
State Item Comment  
Day 1
Completed 2009-10-02
  +  
Day 2
Completed 2009-10-03
  +  
Day 3
Completed 2009-10-04
  +  
Day 4
No measurements
  +  
Day 5
Completed 2009-10-06
  +  
Day 6
Completed 2009-10-07
  +  
Day 7
Completed 2009-10-08
  +  
Day 8
No measurements
  +  
Day 9
No measurements
  +  
Day 10
Completed 2009-10-11
  +  
Day 11
Completed 2009-10-12
  +  
Day 12
Completed 2009-10-13
  +  
Day 13
No measurements
  +  
Day 14
Completed 2009-10-15
  
  

Offset Pointing

(todo - todo done - done )

 +
State Item Comment  
(Az,El) = (0,30)
Observed (1,29) on 2009-10-06
Observed (352,28) on 2009-10-07
  +  
(Az,El) = (0,45)
Observed (11,42) on 2009-10-02
Observed (7,42) on 2009-10-03
  +  
(Az,El) = (0,60)
Observed (340,60) on 2009-10-18
  +  
(Az,El) = (0,75)
Observed (30,68) on 2009-10-18
  +  
(Az,El) = (60,30)
Observed (35,30) on 2009-10-02
  +  
(Az,El) = (60,45)
Observed (65,40) on 2009-10-18
  +  
(Az,El) = (60,60)
Observed (60,55) on 2009-10-19
  +  
(Az,El) = (60,75)
Observed (64,71) on 2009-10-19
  +  
(Az,El) = (120,30)
Observed (117,35) on 2009-10-18
  +  
(Az,El) = (120,45)
Observed (115,45) on 2009-10-19
  +  
(Az,El) = (120,60)
Observed (123,63) on 2009-10-07
  +  
(Az,El) = (120,75)
Observed (135,81) on 2009-10-19
  +  
(Az,El) = (180,30)
Observed (161,39) on 2009-10-18
  +  
(Az,El) = (180,45)
Observed (168,47) on 2009-10-07
Observed (156,39) on 2009-10-08
Observed (160,41) on 2009-10-15
  +  
(Az,El) = (180,60)
Observed (160,63) on 2009-10-18
  +  
(Az,El) = (180,75)
Observed (160,75) on 2009-10-19
  +  
(Az,El) = (240,30)
Observed (232,31) on 2009-10-06
Observed (228,25) on 2009-10-13
  +  
(Az,El) = (240,45)
Observed (224,38) on 2009-10-03
  +  
(Az,El) = (240,60)
Observed (248,62) on 2009-10-04
  +  
(Az,El) = (240,75)
Observed (240,74) on 2009-10-19
  +  
(Az,El) = (300,30)
Observed (296,29) on 2009-10-04
Observed (293,20) on 2009-10-08
  +  
(Az,El) = (300,45)
Observed (297,35) on 2009-10-17
  +  
(Az,El) = (300,60)
Observed (313,51) on 2009-10-18
  +  
(Az,El) = (300,75)
Observed (294,70) on 2009-10-19
  
  

-- JeffMangum - 2009-10-13

Pointing Model Coefficients

All units arcsec.

Date Pad IA IE CA NPAE AN AW HECE HESE
5 October 2009
SEF2
-465.08
-402
+12
-23.19
+7.84
+67.73
-17.49
-13.67
21 November 2009
TF?
-530.9987
-1544.349
-32.64
-23.1800
+36.6769
+28.2618
+32.3262
-24.2086

Date Pad HACA HASA HACA2 HASA2Sorted ascending HECA2 HESA2 HECA3 HESA3 HACA3 HASA3
5 October 2009
SEF2
+1.25
-1.04
+0.93
-1.20
+0.27
-1.37
-0.44
+0.13
-0.50
-0.30
21 November 2009
TF?
-0.4609
-2.1651
+4.5430
-0.0862
+2.0064
-1.0807
-0.4623
+0.2668
-0.3803
-0.6425

-- JeffMangum - 2009-10-05
Topic revision: r10 - 2009-11-23, JeffMangum
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