Changes between Version 5 and Version 6 of Changes/uvsplit


Ignore:
Timestamp:
11/19/07 15:50:14 (17 years ago)
Author:
StacyMader
Comment:

Updated CABB specs and possible overlap with bbcal

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  • Changes/uvsplit

    v5 v6  
    77Add a parameter to uvplit to split up wide bands into a number of sub-bands. This could either be a nsub type keyword specifying the number of bands to split into, or a maxbandwidth keyword to limit the maximum bandwidth of the output files. Some thought needs to go into the naming scheme of the output files, since sub-bands and zoom bands could have identical center frequencies.
    88
    9 The current naming scheme is to use the source name and center frequency (rounded to the nearest integer). For example, hh137.4800 (HH object 137 and 4800 MHz center frequency). For MOPS, each board has an overall bandwidth of 8.3 GHz, divided into four overlapping sub-bands each of 2.2 GHz. MOPS (and CABB?) has two modes:
     9The current naming scheme is to use the source name and center frequency (rounded to the nearest integer). For example, hh137.4800 (HH object 137 and 4800 MHz center frequency). CABB has the following possible modes (each band can have 4096 channels on both pols):
    1010
    11 '''Wideband''' - providing 1024 channels over each 2.2 GHz sub-band, on two polarizations.
     11'''Wideband''' - One can select a single 2 GHz sub-band, on two pols.
    1212
    13 '''Zoom-bands''' - Up two four 138 MHz wide zoom bands within each 2.2 GHz sub-band, on two pols. It can provide 4096 channels on each zoom-band, with up to 16 zoom bands located throughout the full 8.3 GHz frequency range.
     13'''Simple Zoom''' - One can select a 250MHz-wide band within the 2 GHz sub-band.
    1414
    15 If we split using the nsub keyword, a possible naming scheme for uvsplit output files would be to simply put a w (for wideband) or z (for zoom) in the name. For example:
     15'''Multiple Zoom''' (> 2 possible) - One can select up to 8 250MHz-wide bands within each 2 GHz sub-band.
    1616
    17 * For splitting wideband data into n chunks, the output filenames become '''source.cfreq.w.BW.n''' (cfreq is central freq of sub-band n with width BW [M|G]Hz)
     17'''Compound zoom''' - a 2 GHz bandwidth can be split into 15 chunks, each of 16 MHz in width.
    1818
    19 * For zoom bands, the output filenames become '''source.cfreq.z.BW.n'''
     19The above was extracted from the following document:
    2020
     21http://www.atnf.csiro.au/technology/electronics/docs/cabb/p1629.pdf
     22
     23There is perhaps a functional overlap with the bbcal, which at the moment is proposed to split an 8GHz observation into 2GHz sub-bands.
    2124
    2225