#115 Dedispersed data in fil/ar file

[Mugundhan]

Hi,

I'm just starting to use dspsr, and have not been able to get a clear understanding of this. I thought when I did a command like this:

dspsr -A -a PSRFITS -U 1024 -E /mnt/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240312T171500_SE607/B0531+21.par -b 2048 -O /mnt/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240312T171500_SE607/ar/B0531+21_LBCont_test /mnt/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240312T171500_SE607/raw/B0531+21_60381_62099_16070.raw

would dedisperse by taking the ephemeris information from the par file, fold and bin the phases to 2048 bins, but when i inspect this data by plotting (in python by reading the fits file; i read the data from the SUBINT column) I don't see the pulse dedispersed (the data set has a giant pulse).

Similarly when I try this digifil command:

digifil -o /mnt/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240312T171500_SE607/ar/B0531+21_fil_file.fil -b -32 -d 4 -t 16 -F 122:D -D 56.77 /mnt/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240312T171500_SE607/raw/B0531+21_60381_62099_16070.raw

The pulse is not dedispersed in the fil file also. Is there something I'm doing wrong here?

Sincerely,

Mugundhan

[Willem van Straten]

Hi Mugundhan,

By default, neither dspsr nor digifil remove inter-channel dispersive delays. To enable this correction, run dspsr -K or digifil -K

Cheers,
Willem