[Isocops] ATS for Orbit# 205 (4 - 13 May 2013) - v002 approve
fair-play at comcast.net
fair-play at comcast.net
Mon Apr 22 16:05:53 EDT 2013
All,
I've looked at the orbit 205 ATS,
IBEX_2013_125_o0205a_v002.scr,
and I approve.
There are two constraint violations in
IBEX_2013_125_o0205a_v002.ccvr
but they are related to the apogee sun pointing maneuver in orbit 204 (reason for this violation explained by Tim) and by the eclipse.
The PL commands in the v002 ATS match those in the v002 STF,
IBEX_2013_124_o0205a_v002.stf.
Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF file,
IBEX_2013_125_o0205a_v002.oef,
and as verified with ibex_orbit.
There is a star tracker outage in arc B. It starts about 16 hours before 15 Re descending and ends about 1.5 hours after the perigee maneuver window opens (thus delaying the maneuver).
There are no moon in Lo FOV sessions.
The ground station command sequences are correct and bit rates match those in the contacts file,
IBEX_Orbit205Contacts.txt
for all contacts (4).
The LE flag is set during the eclipse and the balancing command timing and states match those in the CAR,
CAR-615-EclipseCommands.doc.
The commands are offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 204 left us pointing in safe directions for orbit 205 arc A ascending and descending sequences:
ibex_rotate -o -u 0.746913,0.61398,0.255243 -w ibex-sun -t 2013/05:04:22:53:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.746913,+0.613980,+0.255243
which is R.A. +39.421 Decl. +14.788
missing R.A. +41.982 Decl. +16.171 (ibex-sun)
error is R.A. +2.561 Decl. +1.383
for a total 2.829 deg
ibex_rotate -o -u 0.746913,0.61398,0.255243 -w ibex-sun -t 2013/05:08:10:35:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.746913,+0.613980,+0.255243
which is R.A. +39.421 Decl. +14.788
missing R.A. +45.470 Decl. +17.140 (ibex-sun)
error is R.A. +6.049 Decl. +2.352
for a total 6.272 deg
The inertial precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences:
ibex_rotate -o -u 0.69416,0.664328,0.277147 -w ibex-sun -t 2013/05:08:12:18:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694160,+0.664328,+0.277147
which is R.A. +43.742 Decl. +16.090
missing R.A. +45.540 Decl. +17.159 (ibex-sun)
error is R.A. +1.798 Decl. +1.069
for a total 2.027 deg
ibex_rotate -o -u 0.69416,0.664328,0.277147 -w ibex-sun -t 2013/05:08:13:53:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694160,+0.664328,+0.277147
which is R.A. +43.742 Decl. +16.090
missing R.A. +45.604 Decl. +17.177 (ibex-sun)
error is R.A. +1.862 Decl. +1.087
for a total 2.089 deg
ibex_rotate -o -u 0.69416,0.664328,0.277147 -w ibex-sun -t 2013/05:12:22:11:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694160,+0.664328,+0.277147
which is R.A. +43.742 Decl. +16.090
missing R.A. +49.730 Decl. +18.303 (ibex-sun)
error is R.A. +5.988 Decl. +2.213
for a total 6.133 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 206 apogee:
ibex_rotate -o -u 0.63749,0.710819,0.297225 -w ibex-sun -t 2013/05:13:02:38:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.637490,+0.710819,+0.297225
which is R.A. +48.113 Decl. +17.291
missing R.A. +49.900 Decl. +18.350 (ibex-sun)
error is R.A. +1.787 Decl. +1.059
for a total 2.004 deg
ibex_rotate -o -u 0.63749,0.710819,0.297225 -w ibex-sun -t 2013-05-17T23:53:33.989Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.637490,+0.710819,+0.297225
which is R.A. +48.113 Decl. +17.291
missing R.A. +54.870 Decl. +19.488 (ibex-sun)
error is R.A. +6.757 Decl. +2.197
for a total 6.777 deg
No Lo O-mode.
There is no overlap with orbit 204 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi .
Command Approval Checklist is attached.
Ken
----- Original Message -----
From: "Tim Perry" <Perry.Tim at orbital.com>
To: "Bret Hautamaki" <hautamaki.bret at orbital.com>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <ibexops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <lockwood.robert at orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
Sent: Saturday, April 20, 2013 12:22:59 PM
Subject: [Isocops] ATS for Orbit# 205 (4 - 13 May 2013)
All,
I did receive 2 errors. The Second one was an easy one and this is
covered by the eclipse commands that we added for the medium eclipse. The
first one took a little bit time to understand. In Orbit 204 there was a
sun maneuver at Apogee. The maneuver window was from 2013-04-29T21:34:03 -
2013-04-29T22:04:05 and the sun maneuver was from 2013-04-29T21:34:03 -
2013-04-29T21:49:03. So, in the OEF file for Orbit 204 these times were
correct. Now, when the new forecast STF file was used to generate the OEF
file for Orbit 205. The maneuver window had shifted by 1 minute and 31
seconds. In the Orbit 205 OEF file I found that the sun maneuver begin was
pulled from the history. But the sun maneuver end was not and I think that
this was because of where the new maneuver window begin was placed in the
OEF file. The end time is the last time in the orbit 205 OEF file. MPS
tried to find the SunMvrEnd and it couldn't. The sun maneuver was
successful. So, I am comfortable with releasing this command load for
everyone to approve.
Please respond to this email thread with your comments/approvals. All
comments/approvals are required before 22 Apr 13 @2100 UTC
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-001: Sun precession maneuver at 2013/04/29 21:34:03 UTC -
2013/05/18
09:52:58 UTC (one endpoint unknown) overlaps eclipse at
2013/05/04
19:45:49 UTC - 2013/05/04 20:52:24 UTC
IBX-CLC-015: Battery charge falls below minimum from 2013/05/04 20:39:49
UTC -
2013/05/04 21:20:04 UTC. Lowest charge level is 7260.242983
watt-minutes during this interval.
==============
OTHER MESSAGES
==============
NO MESSAGES.
STF files:
# Filename: IBEX_2013_forecast_04mar13-18jun13_v001.stf
#Orbit: 204
# Sun pointing maneuver
2013-04-29T21:34:03.000Z|ManeuverWindowStart
2013-04-29T22:04:05.000Z|ManeuverWindowEnd
# Filename: IBEX_2013_forecast_01apr13-24jul13_v001.stf
#Orbit: 204
# Sun pointing maneuver
2013-04-29T21:35:34.000Z|ManeuverWindowStart
2013-04-29T22:05:36.000Z|ManeuverWindowEnd
OEF Files:
# Filename: IBEX_2013_115_o0204a_v001.oef
2013-04-29T21:34:03.000Z,ManeuverWindowStart
2013-04-29T21:34:03.000Z,SunMvrBegin,
2013-04-29T21:49:03.000Z,SunMvrEnd
2013-04-29T22:04:05.000Z,ManeuverWindowEnd,orbit:204
# Filename: IBEX_2013_125_o0205a_v001.oef
2013-04-29T21:34:03.000Z,SunMvrBegin,
2013-04-29T21:35:34.000Z,ManeuverWindowStart,orbit:204
2013-04-29T22:05:36.000Z,ManeuverWindowEnd,orbit:204
(See attached file: IBEX_2013_125_o0205a_v001.ccvr)(See attached file:
IBEX_2013_125_o0205a_v001.oef)(See attached file:
IBEX_Orbit205Contacts.txt)(See attached file:
IBEX_2013_125_o0205a_v001.txt)
Timothy E. Perry
IBEX Mission Ops Lead
perry.tim at orbital.com
Office: (703) 406-5976
Cell:(301) 606-1430
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