| Version 8 (modified by , 17 years ago) (diff) |
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Changes/uvsplit
uvsplit Item Complexity Research Milestone Time split up frequency band moderate none 8 5d
Add 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.
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). CABB has the following possible modes (each band can have 4096 channels on both pols):
Wideband - One can select a single 2 GHz sub-band, on two pols.
Simple Zoom - One can select a 250MHz-wide band within the 2 GHz sub-band.
Multiple Zoom (> 2 possible) - One can select up to 8 250MHz-wide bands within each 2 GHz sub-band.
Compound zoom - a 2 GHz bandwidth can be split into 15 chunks, each of 16 MHz in width.
The above was extracted from the following document:
http://www.atnf.csiro.au/technology/electronics/docs/cabb/p1629.pdf
There is perhaps a functional overlap with the bbcal, which at the moment is proposed to split an 8GHz observation into 2GHz sub-bands.
It is also interesting that the Pulsar data from the digital filterbanks (CABB-style boards) can be split using the ATNF Pulsar software (TEMPO2?) It may be possible to re-use that code here. MarkCalabretta? has also modified LIVEDATA to cope with MOPS data which includes both broad and zoombands.
