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Дата индексирования: Tue Dec 25 00:08:02 2007
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Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п
Where is my Filterbank Data

Where is my Filterbank Data

Unfortunately at this stage fining out what tape your filterbank data is on is a non-trivial exercise. If you are reprocessing old data then there are two ways to check which tape it is on
  • The first involves looking through the log books whcich live in Dick's office. Not only is this method laborious it is often not very accurate especially now that the observing is mostly controlled from the Sun Workstation.
  • The second method will be more accurate but not necessarily any less laborious. The first place to check for old data is in the obsarch.log and obspsr.log files in /psr3/data/log. These contain an extensive list of all timing observations up to May 1995 (It is hoped to keep these files as up to date as possible). The obsarch.log file lists all observations by archive name, that is UT order, while obspsr.log lists by pulsar order. The basic format of these files is:

    psrname; UT; tape number; recorded file number; estimated file number

    Note that there may be information after these initial four entries and these will correspond to things like observing frequency and sampling rates. There are a couple of other points to note, only the number of the tape is recorded and there have been three different letters used. The Q tapes are the most recent and any observation after January 14 1995 will probably be on a Q tape. The P tapes preceeded the Q tapes and also contain mainly timing data however their numbering convention is not quite so simple. They go from 0-65 then from 866-999. The S tapes correspond to the 70cm survey tapes and these contain some timing data also and they number from 0 to approximately 650. So you see that there is cause for confusion between the early P tapes and S tapes.
  • So the suggested course of action is to firstly go to obspsr.log and find the tape number then if it lies in the zone of confusion go to obsarch.log and look for the archive you want, if there are a whole lot of archives on the same tape then chances are it is a P tape, if not then it is probably a S tape.
  • Another difficulty is that sometimes the file number is recorded incorrectly so the estimated true file number tries to correct for that. However this may still be incorrect so it is best to extract a number of files either side of the actual file you want as a precautionary measure.
  • If your observation has not yet been added to the .log files then it will be contained in a file on the vax, Bunyip, at Parkes. In order to access it you will need to ask someone who knows the username and password for this account. Once you are logged in type usur followed by dir summ* which will list a number of summary files. The most recent of these will be called summary.wk and it will contain a list of all the observations made using the filterbank since a file called Summary.MonthYear was made. To look at any of these files type type/page filename. The current format is

    Pulsar name; Date; Tape Number; File number; ...

    there is a lot of other information stored there, but these are the important entries in this case.

    Good Luck!

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