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difx:pulsar [2018/08/13 16:26]
cormac
difx:pulsar [2018/08/14 15:15]
cormac
Line 17: Line 17:
  
   * Polycos can be produced by tempo or tempo2. ​ However, tempo2 has some known failure modes when writing polycos; certain of the tempo2-only parameters in the ephemeris seem not to get propagated to the polyco. ​ Accordingly,​ it is recommended to use tempo to produce polycos if at all possible. ​ Note, however, that you can't just take a tempo2 eph file and use it with tempo! Ask for some help from a local pulsar expert.   * Polycos can be produced by tempo or tempo2. ​ However, tempo2 has some known failure modes when writing polycos; certain of the tempo2-only parameters in the ephemeris seem not to get propagated to the polyco. ​ Accordingly,​ it is recommended to use tempo to produce polycos if at all possible. ​ Note, however, that you can't just take a tempo2 eph file and use it with tempo! Ask for some help from a local pulsar expert.
-  * Polyco files produced using tempo2 (to generate a tempo(1) format polyco) often have '​coe'​ instead of the required '​0'​ for the observatory number and this causes older DiFX versions to fail. The polyco file must be edited e.g. with ''​sed -i "​s/​coe/ ​ 0/g" polyco.dat''​.+  * Polyco files produced using tempo2 (to generate a tempo(1) format polyco) often have '​coe'​ instead of the required '​0'​ for the observatory number and this causes older DiFX versions to fail. The polyco file must be edited e.g. with ''​sed -i "​s/​coe/​ 0 /g" polyco.dat''​.
   * Know which type of ephemeris file you have. Certain catalogs like PSRCAT provide either tempo2 or tempo ephemerides,​ depending on the pulsar. Tempo2 ephemeris files usually have prefix .eph and have TCB units. Old tempo files are .par and have TDB units.   * Know which type of ephemeris file you have. Certain catalogs like PSRCAT provide either tempo2 or tempo ephemerides,​ depending on the pulsar. Tempo2 ephemeris files usually have prefix .eph and have TCB units. Old tempo files are .par and have TDB units.
   * Old tempo .par can be converted into tempo2 .eph (''​tempo2 -gr transform tempo1.par new_tempo2.eph''​ assuming you installed tempo2 plugins), although, for DiFX you might really not want to do that.    * Old tempo .par can be converted into tempo2 .eph (''​tempo2 -gr transform tempo1.par new_tempo2.eph''​ assuming you installed tempo2 plugins), although, for DiFX you might really not want to do that. 
difx/pulsar.txt · Last modified: 2018/08/16 14:53 by cormac