Changes between Version 12 and Version 13 of Notes/ExampleReduction


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Timestamp:
03/26/09 12:18:44 (15 years ago)
Author:
JamieStevens
Comment:

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  • Notes/ExampleReduction

    v12 v13  
    9191and recalibrate as before. The `real,imag` plot now looks like this:
    9292
     93[[Image(cx167_example_plot6.png)]]
     94
     95Not perfect, but it is good enough for now.
     96
     97The next step is where CABB reduction really differs from that of the old correlator. We need to determine
     98whether we want to attack the dataset as a whole, working with all 2 GHz of bandwidth simultaneously, or
     99do we want to "divide and conquer" by splitting the band into chunks similar to those output by the old
     100correlator and that we know will work fine with MIRIAD?
     101
     102In this example we will look at how to proceed in both directions, but we will go through the "divide and
     103conquer" (DAC) procedure first.
     104
     105To begin the DAC procedure, we use the new CABB `uvsplit` to split the visibility file, not only based on
     106source, but into fixed bandwidth chunks. Since we know that 128 MHz bandwidth works in MIRIAD, we choose this
     107for `uvsplit`:
     108
     109`uvsplit vis=cx167.uv select=-auto,-ant(6) maxwidth=0.128`
     110
     111This produces visibility sets for 1934-638, 0515-674 and rnovalmc, at centre frequencies (in MHz) of
     1124540, 4668, 4796, 4924, 5052, 5180, 5308, 5436, 5564, 5692, 5820, 5948, 6076, 6204, 6332 and 6460; a total
     113of 16 bands (16 x 128 MHz = 2048 MHz, the actual bandwidth of CABB).
     114