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Re: [dspsr-users] problems with dspsr on 1-pol DFB search mode data
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From: Marta B. <bu...@oa...> - 2017-05-09 08:48:23
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Hi Scott, it works just fine with presto (if you add -noscales -nooffsets) as well as with the previous dspsr (for sure the version from 2014 compiled with psrchive devel version). M. On Mon, 8 May 2017, Scott Ransom wrote: > Hey Marta, > > I know that the 1-bit format changed sometime over the last couple years. > The bit ordering in each byte was reversed (i.e. going from LSB to MSB first, > or vise versa). I doubt that that would make this issue, but it is hard to > tell. > > Have you tried folding the data with PRESTO? > > Scott > > On 05/05/2017 03:45 AM, Marta Burgay wrote: >> Dear all, >> >> it looks like the most recent version of dspsr fails to fold search mode >> data recorded with the DFB (at both Parkes and the Sardinia Radio >> Telescope) with 1 polarization. >> >> In attachment you can see an example of what happens folding the same >> data file with the same set of ephemeris with an old version of dspsr >> (installed through PSRsoft, I believe, in 2015) and with the newest >> version. >> >> I did a few tests with SRT data (1-pol 1-bit, 1-pol 2-bits) and PKS data >> (1-pol 1-bit, 4-pol 8-bits) taken in search mode wih the DFB. The latest >> dspsr works fine only on the latter (even though the results are still a >> little better with the old dspsr [pdmp SNR 16 vs 15; first channel >> saturated with the new dspsr]). >> >> I tried both with polyco and predictor and using an ephemeris file or >> giving P and DM directly. Nothing changes. >> >> I'm not sure whether the problem is directly related to dspsr or if it >> depends on psrchive. For SRT data, in fact, I used to install the >> development version of psrchive, before installing dspsr. This solved an >> issue (a warning about an itoa_code not found) that now, with the >> currently available versions of psrchive and dspsr, is back. >> >> Is anyone else having the same problem? Any idea of what can be going on? >> >> Thanks! >> >> Marta >> >> --------------------- (> * --------------------- >> Marta Burgay c/o >> INAF - Osservatorio Astronomico di Cagliari >> via della Scienza 5 >> 09047 Selargius (CA) >> Italy >> tel +39 070 71180 249 >> fax +39 070 71180 222 >> --------------------------------------------------- >> >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> >> >> >> _______________________________________________ >> dspsr-users mailing list >> dsp...@li... >> https://lists.sourceforge.net/lists/listinfo/dspsr-users >> > > -- > Scott M. Ransom Address: NRAO > Phone: (434) 296-0320 520 Edgemont Rd. > email: sr...@nr... Charlottesville, VA 22903 USA > GPG Fingerprint: A40A 94F2 3F48 4136 3AC4 9598 92D5 25CB 22A6 7B65 > --------------------- (> * --------------------- Marta Burgay c/o INAF - Osservatorio Astronomico di Cagliari via della Scienza 5 09047 Selargius (CA) Italy tel +39 070 71180 249 fax +39 070 71180 222 --------------------------------------------------- |
