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From flemoine@geodesy2.gsfc.nasa.gov Mon May 21 13:59 PDT 2001
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From: Frank Lemoine <flemoine@geodesy2.gsfc.nasa.gov>
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Subject: AMD epochs during contingency mode (forwarded)
To: rsimpson@magellan.stanford.edu
Date: Mon, 21 May 2001 20:59:53 GMT
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Status: RO

 forward from Stuart Demcak.
>
> Here are some AMD epochs that I derived during contingency mode, after a lot
> of work fitting the Doppler data.  I think that most of the times are fairly
> good (whatever that means).  A couple were during a large data gap, so they
> had to be guessed at and may be quite a bit off.  The estimated times of two
> or so other AMDs are probably not as good as I would hope.
>
> These times were derived by guessing at the correct time, fitting several
> different data arcs (with different Doppler spin adjust cards), then repeating
> this process with a new time estimate until a good fit of the Doppler had been
> achieved.
>
> Here are ODP inputs for these AMD models (and HGA orientation change) with
> a few notes that were included in my runs.
>
>   MB1T( 1)   = '03-MAY-2001 15:15:00.000  UTC'  $HGA orient (15:13:50-15:17:05)
>   MB1T( 2)   = '04-MAY-2001 03:08:30.000  UTC'  $AMD (03:08-03:30)
>   MB1T( 3)   = '04-MAY-2001 08:43:20.000  UTC'  $AMD
>
>   MB1T( 1)   = '04-MAY-2001 14:31:25.000  UTC'  $AMD
>   MB1T( 2)   = '04-MAY-2001 19:59:00.000  UTC'  $AMD (14:40-20:13:30)
>   MB1T( 3)   = '05-MAY-2001 01:36:00.000  UTC'  $AMD (01:23-02:07)
>   MB1T( 4)   = '05-MAY-2001 07:22:00.000  UTC'  $AMD (07:15:50-08:01:45)
>
>   MB1T( 1)   = '05-MAY-2001 19:00:00.000  UTC'  $AMD
>   MB1T( 2)   = '06-MAY-2001 00:55:00.000  UTC'  $AMD
>   MB1T( 3)   = '06-MAY-2001 11:38:50.000  UTC'  $AMD
>
>   MB1T( 1)   = '06-MAY-2001 17:48:20.000  UTC'  $AMD
>   MB1T( 2)   = '06-MAY-2001 23:05:00.000  UTC'  $AMD (22:31-23:15:30)
>   MB1T( 3)   = '07-MAY-2001 06:04:30.000  UTC'  $AMD
>   MB1T( 4)   = '07-MAY-2001 12:13:00.000  UTC'  $AMD
>
> The accuracy of these times cannot be guaranteed.  However, the Doppler fits
> fairly nicely using the times (along with spin adjust cards).  At least this
> information might serve as a better starting point for others than no
> information at all.
>
> -------------------------------------------------------------------------------
> Stuart Demcak               |  Mars Global Surveyor (MGS),  Navigation Team
> Stuart.Demcak@jpl.nasa.gov  |  Jet Propulsion Laboratory
> -------------------------------------------------------------------------------
>
>