public:dataproduct:discussion_of_observations

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public:dataproduct:discussion_of_observations [2007-06-12 12:57] – created Arno Schoenmakerspublic:dataproduct:discussion_of_observations [2017-03-08 15:27] (current) – external edit 127.0.0.1
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 This area is for more detailed comments about problems and tests done with specific observations.  Start a new subsection for your favorite observation! This area is for more detailed comments about problems and tests done with specific observations.  Start a new subsection for your favorite observation!
  
-=====  2333  =====+===== L2007_03693 ===== 
 +Studied reflected signal of Italian TV station in SB3 (channel 179).  Found roughly 20 individual events of different durations (0.1-4 s) and shapes (FRED profile to broad lump).  See more in presentation by Casey at August 
 +[[http://usg.lofar.org/doku.php?id=documents:minutes:2007:2007-08-29_cs-1_meeting | CS1 meeting]]. 
 + 
 + 
 +===== L2007_03453 ===== 
 + 
 +reflections of distant TV stations seen with LBA at 200MHz on subbands 247,282,283,319 
 + 
 +=====  L2007_02339  ===== 
 +Sarod used this data set to make the deep, all-sky map named ??.  The MeqTrees .tdl.conf file is below: 
 + 
 + 
 +=====  L2007_02333  =====
   * Position error in images from first subband is gone.  I assume reference frequency error was fixed.  (casey)   * Position error in images from first subband is gone.  I assume reference frequency error was fixed.  (casey)
  
-=====  2216  =====+=====  L2007_02216  =====
   * Phase wrap problem disappeared.  Why?   * Phase wrap problem disappeared.  Why?
   * Dipole number 15x now works.   * Dipole number 15x now works.
   * First subband of each MS has shift in positions. Sarod says this is caused by an error in the reference frequency for the first subband of each MS. (casey)   * First subband of each MS has shift in positions. Sarod says this is caused by an error in the reference frequency for the first subband of each MS. (casey)
  
-=====  2113  =====+=====  L2007_02113  =====
   * Phase wrap problem with CS016.  All baselines between CS016 dipoles and non-CS016 dipoles have a rapid change in phase with frequency.  About twelve turns of phase are observed across the 256*0.6 kHz subbands.     * Phase wrap problem with CS016.  All baselines between CS016 dipoles and non-CS016 dipoles have a rapid change in phase with frequency.  About twelve turns of phase are observed across the 256*0.6 kHz subbands.  
   * Closure phase experiment for phase wrap problem:  add phases along three baselines (e.g., 1-13 + 13-14 + 14-1).  This sum is constant, which suggests that the phase wrap is related to a delay problem between CS016 and the other stations.  It probably does not occur in the correlator.  (Can someone confirm this?)   * Closure phase experiment for phase wrap problem:  add phases along three baselines (e.g., 1-13 + 13-14 + 14-1).  This sum is constant, which suggests that the phase wrap is related to a delay problem between CS016 and the other stations.  It probably does not occur in the correlator.  (Can someone confirm this?)
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   * First subband of each MS has shift in positions.  Sarod says this is caused by an error in the reference frequency for the first subband of each MS. (casey)   * First subband of each MS has shift in positions.  Sarod says this is caused by an error in the reference frequency for the first subband of each MS. (casey)
  
-=====  2092  =====+=====  L2007_02092  =====
   * Phase wrap problem first of CS016 first seen?   * Phase wrap problem first of CS016 first seen?
  
  • Last modified: 2007-06-12 12:57
  • by Arno Schoenmakers