-----Original
Message-----
From: Bobby Williams [mailto:Bobby.Williams@kinetx.com]
Sent: Tuesday, March 28,
2006 7:26 PM
To: Neil Ottenstein;
michael.A.Mesarch.1@gsfc.nasa.gov
Subject: RE: STEREO MDNR
Action item #8
Hello
Neil,
I have read over the
attached procedure and agree that it provides the mechanism for comparing
trajectories for small time increments around a propulsive maneuver. As
long as the content of the trajectory files being compared is correct, then this
will answer my action item.
Thank
you,
Bobby
Williams
From: Neil
Ottenstein [mailto:Neil.Ottenstein@ai-solutions.com]
Sent: Tuesday, March 28, 2006 11:21
AM
To: 'Strikwerda,
Thomas'
Subject: FW: STEREO
MDNR Action item #8
From: Neil
Ottenstein [mailto:Neil.Ottenstein@ai-solutions.com]
Sent: Tuesday, March 14, 2006 11:50
AM
To:
'michael.A.Mesarch.1@gsfc.nasa.gov'
Cc: 'bobby.williams@kinetx.com'
Subject: FW: STEREO MDNR Action item
#8
From: Neil
Ottenstein [mailto:Neil.Ottenstein@ai-solutions.com]
Sent: Wednesday, February 01, 2006 11:52
AM
To: 'michael.A.Mesarch.1@gsfc.nasa.gov'
Subject: STEREO MDNR Action item
#8
§ Area of Concern:
Use DSN tracking as independent check on
ÄV
§ Originator/Organization:
Bobby Williams / KinetX,
Inc.
§ Action:
Maneuver reconstruction does not appear
to use the independent
measurement from DSN
tracking. The on-board telemetry-based calibration of
a
maneuver is subject to
biases, and does not indicate effective ÄV (e.g.,
accelerometer
closed-loop maneuver telemetry will indicate a perfect
maneuver
cutoff even though there
may be an under/over burn). I recommend using the
DSN tracking to provide
a valuable, independent measure of the effective ÄV
from each maneuver. This
information can be used to calibrate the maneuver
system (including
thruster characteristics and impingement effects) after a
few
maneuvers. Although the
line-of-sight information from DSN is helpful, I
recommend estimating the
maneuver ÄV directly in the orbit determination
process based on an arc
of DSN tracking that spans a few days either side of
the
maneuver. If the STK
program is unable to perform such a maneuver
estimate,
consider using JPL or
KinetX capabilities to provide this direct
estimate.
Maneuver reconstruction
from DSN data has been used for maneuver
calibration
on NEAR, CONTOUR,
MESSENGER, and eventually New Horizons. (Slide:
MD Finite Burns
-19)
Attached is a draft of a procedure
for accomplishing this.
Neil