[Crater-team] Proper Processing of CRaTER Data (1-second shift?)

[Anthony Case]

I did not.  I saw Mark's comments, but would still like to verify how the
pipeline code is taking care of the offset.  Maybe I just need to take a
peek at the processing code.

Tony


---------------------------------------------------------------------

Anthony Case

Astrophysicist

High Energy Astrophysics Division (HEAD/SSXG)

Center for Astrophysics | Harvard & Smithsonian

Cell: (617) 304 0768

60 Garden Street | MS 58 | Cambridge, MA 02138


On Mon, Jun 29, 2020 at 11:48 AM de Wet, Wouter <Wouter.deWet at unh.edu>
wrote:

> Tony,
>
>
>
> Did you ever find the information you needed to resolve this?
>
>
>
> Wouter
>
>
>
>
>
> *From: *Crater-team <crater-team-bounces at lists.sr.unh.edu> on behalf of
> Mark D Looper <mark.d.looper at aero.org>
> *Date: *Wednesday, June 24, 2020 at 2:00 PM
> *To: *Anthony Case <tonycase at cfa.harvard.edu>, "
> crater-team at lists.sr.unh.edu" <crater-team at lists.sr.unh.edu>
> *Subject: *Re: [Crater-team] Proper Processing of CRaTER Data (1-second
> shift?)
>
>
>
> Hello—
>
>
>
>                 Hrm – I have never done any analyses that require lining
> up the HK or lro_spice files with one-second accuracy; I just need to know
> altitude and attitude, which change little in 1 second, as opposed to
> Jody’s mapping work that needs a precise ground track, say.  However, with
> regard to the PRI and SEC files, I list the number of PRI events per second
> of day based on the timestamps in the L2_PRI files and compare that with
> the number of good events at each second in the L1_SEC files based on those
> timestamps.  For the vast majority of the 86400 seconds each day, these two
> counts agree; a couple of times a day they differ by one, except on days
> when the calibration pulser is active, when there are usually a couple of
> hundred that disagree.  (I’d have to go back and look at the bigger SEP
> events, if you have days about which you’re particularly concerned).  These
> are just for the set of all valid events, as counted by the instrument and
> with the count reconstructed by me from the PHA events; I also strip counts
> per second for individual detectors and for coincidence rates, if you want
> me to go back and compare those with the sensor-reported rates.  Can’t help
> with HK or lro_spice, though, I’m afraid.
>
>
>
> Thanks—
>
> --Mark
>
>
>
> p.s. Is the telecon on today?  Do we default to “yes” or “no” if no
> announcement is sent out?
>
>
>
> Mark D. Looper
> Space Sciences Department
> The Aerospace Corporation
> M/S M2-260
> P.O. Box 92957
> Los Angeles, CA 90009-2957
> Mobile: 310-529-3406
> Voicemail: 310-336-6302
>
> Publications: https://www.loopers.org/curvitae.html
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>
>
>
> *From: *Crater-team <crater-team-bounces at lists.sr.unh.edu> on behalf of
> Anthony Case <tonycase at cfa.harvard.edu>
> *Date: *Wednesday, June 24, 2020 at 4:44 AM
> *To: *"crater-team at lists.sr.unh.edu" <crater-team at lists.sr.unh.edu>
> *Subject: *[Crater-team] Proper Processing of CRaTER Data (1-second
> shift?)
>
>
>
> Hi all,
>
>
>
> I'm hoping somebody can remind me of the proper time-synching of PRI, SEC,
> HK, and lro_spice files.
>
>
>
> As I recall, the primary science packets are tagged with the time of the
> second in which they are *sent*, meaning that the data were actually
> recorded during the prior second.  So to properly compare with secondary
> science to get the configuration of the instrument, you need to compare the
> primary science data from second "n" to the secondary science from second
> "n-1".
>
>
>
> Is this time shift accounted for in the L2 files? Or do I need to do that
> myself?
>
>
>
> Does the same shift need to happen with the lro_spice files and
> housekeeping files?
>
>
>
> Tony
>
>
>
>
> *---------------------------------------------------------------------*
>
> *Anthony Case*
>
> *Astrophysicist*
>
> High Energy Astrophysics Division (HEAD/SSXG)
>
> *Center for Astrophysics | Harvard & Smithsonian*
>
> Cell: (617) 304 0768
>
> 60 Garden Street | MS 58 | Cambridge, MA 02138
>
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