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The Offline PFB uses the same polyphase filter that was used in the legacy system by default (see McSweeney et al. 2020), but alternative filters will be made available in the future. The filters are always applied on the second boundaries, and the tap size is determined from the length of the filter and the number of desired output channels. No attempt is made apply any time or phase adjustments to the voltages either before or after the PFB is applied.
The default mode of the PFB, and the FINEPFB filter, are described in the beginning of McSweeney et al. (2020).
Command line options
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usage: fine_pfb_offline [OPTIONS] REQUIRED OPTIONS -m, --metafits=FILE FILE is the metafits file for the target observation OPTIONAL OPTIONS -b, --begin=GPSTIME Begin time of observation, in GPS seconds If GPSTIME starts with a '+' or a '-', then the time is taken relative to the start or end of the observation respectively. [default: "+0"] -d, --data-location=PATH PATH is the directory containing the recombined data [default: current directory] -f, --coarse-chan=CHAN Coarse channel number If CHAN starts with a '+' or a '-', then the channel is taken relative to the first or last channel in the observation respectively. Otherwise, it is treated as a receiver channel number (0-255) [default: "+0"] -S, --synth_filter=FILTER Apply the named filter during high-time resolution synthesis. File [RUNTIME_DIR]/FILTER.dat must exist [default: FINEPFB] -T, --nseconds=VAL Process VAL seconds of data [default: as many as possible] OTHER OPTIONS -h, --help Print this help and exit -V, --version Print version number and exit |
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