\header

ENTRY_TIME        =  1999 DEC 14 23:40:18
SYSTEM_NAME       = SST
AUTHOR            = CHARLES ACTON
INSTITUTION       = JPL
START_TIME        =  1999 MAR 10 00:00:00
STOP_TIME         = NULL
TARGET            = MARS
ORBIT             = 13


\text

Note:  This message had originally been placed in the Data Administration
and Archive ENB, on 1999 MAR 13.  It is now being inserted in the Science
Support Team ENB and will be removed from the DAA portion.

  -Chuck Acton   14-DEC-1999


             ********  Regarding CK time tag "errors." *********

Status: U
X-Sender: jglance@pop.jpl.nasa.gov
Mime-Version: 1.0
Date: Fri, 12 Mar 1999 12:08:20 -0700
To: "Eckart, Dave F" <dave.f.eckart@lmco.com>
From: "Walter J Glance" <Walter.J.Glance@jpl.nasa.gov>
Subject: Re: MGS Digital Filter
Cc: William.B.Banerdt@jpl.nasa.gov, john.l.callas@jpl.nasa.gov,
         Timothy.J.Parker@jpl.nasa.gov, trish@rodan.jpl.nasa.gov,
         rspringe@mail1.jpl.nasa.gov, danielw@jplsp2.jpl.nasa.gov,
         fpalluco@mail1.jpl.nasa.gov, warren@msss.com, malin@msss.com,
         mehall@asu.edu, elman@elysium.gsfc.nasa.gov,
         jsmith@eib1.gsfc.nasa.gov, mha@lepmom.gsfc.nasa.gov,
         ricks@sunspot.ssl.berkeley.edu, dwc@sunspot.ssl.berkeley.edu,
         jester@osb1.wff.nasa.gov, jensen@msss.com, kcbender@asu.edu,
         rsimpson@magellan.Stanford.EDU, monte.kaelberer@gsfc.nasa.gov,
         Jeff Schott <schott@tharsis.gsfc.nasa.gov>, homan@asu.edu,
         cacton@mail1.jpl.nasa.gov, bsemenov@spice.jpl.nasa.gov,
         tthorpe@mail1.jpl.nasa.gov, bwaggone@mail1.jpl.nasa.gov,
         cwhetsel@mail1.jpl.nasa.gov

Dave,

Thankyou very much for the update. Your info will correct a statement I
recently made to Bruce Banerdt of MOLA team - as of yesterday he was given
the impression that toggling still occurs.  The info will be forwarded to
all MGS science teams.

Thanks,
-- Jesse


----------------
>Jesse,
>
>Fixed High Gain Mapping (began 99-068T00:00) has used, and will continue to
>use, the 4th order IIR digital filter with the 2.3 sec (approx.) data
>latency. The toggling of the filter gains ended with the Moc Cal period. We
>are currently assessing the filters interaction with the nominal aacs modes
>(ISH, ANS) and unless the filter is found to have unfavorable interactions
>with these modes with the current spacecraft inertia we will continue to use
>the same 4th order filter until the completion of the mission. This means
>that any post processing of the rate and quaternion data after the time
>listed above should account for the 2.3 second delay in the time tag and in
>the header information of the C-Kernel. If you have any questions please
>contact me, or Stu Spath.
>
>Thanks,
>Dave Eckart
>MGS AACS
>Dave.F.Eckart@lmco.com
>(303)977-6457


(Walter J. Glance, Jr.)






Apparently from: cacton@mail1.jpl.nasa.gov