[Isocops] IBEX Orbit #491 ATS Approval ( 15 - 25 June2020 )
Weaver, Carol
Carol.Weaver at unh.edu
Thu May 21 15:34:15 EDT 2020
Hi all,
I have looked at the orbit 491 ATS files: IBEX_2020_167_o0491a_BUS_v001.scr, IBEX_2020_167_o0491a_INST_v001.scr, and IBEX_2020_167_o0491a_v001.scr and I approve.
The constraint violations in IBEX_2020_158_o0491a_BUS_v001.ccvr and IBEX_2020_158_o0491a_INST_v001.ccvr relate to the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2), and battery voltages dropping below charge level which is expected during an eclipse.
The PL commands in IBEX_2020_167_o0491a_INST_v001.scr match those in the v002 STF (IBEX_2020_167_o0491a_v002.stf).
Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time, and 15 Re descending as determined by the OEF IBEX_2020_167_o0491a_BUS_v001.oef and verified with ibex_orbit.
There is one star tracker outage. The outage starts about 4.5 hours after 15 Re descending and runs for about 9 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file IBEX_Orbit491_Contacts.txt for all contacts (3).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 490 left us pointing in safe directions for the orbit 491 arc A ascending and descending sequences:
ibex_rotate -o -u 0.13298,0.912894,0.385922 -w ibex-sun -t 2020/06:15:22:54:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.132980,+0.912896,+0.385923
which is R.A. +81.712 Decl. +22.701
missing R.A. +84.519 Decl. +23.320 (ibex-sun)
error is R.A. +2.806 Decl. +0.619
for a total 2.656 deg
ibex_rotate -o -u 0.13298,0.912894,0.385922 -w ibex-sun -t 2020/06:19:15:23:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.132980,+0.912896,+0.385923
which is R.A. +81.712 Decl. +22.701
missing R.A. +88.392 Decl. +23.431 (ibex-sun)
error is R.A. +6.680 Decl. +0.729
for a total 6.188 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 0.058278,0.919904,0.387789 -w ibex-sun -t 2020/06:19:17:06:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.058278,+0.919904,+0.387789
which is R.A. +86.375 Decl. +22.817
missing R.A. +88.468 Decl. +23.432 (ibex-sun)
error is R.A. +2.093 Decl. +0.615
for a total 2.021 deg
ibex_rotate -o -u 0.058278,0.919904,0.387789 -w ibex-sun -t 2020/06:19:18:41:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.058278,+0.919904,+0.387789
which is R.A. +86.375 Decl. +22.817
missing R.A. +88.538 Decl. +23.434 (ibex-sun)
error is R.A. +2.163 Decl. +0.617
for a total 2.083 deg
ibex_rotate -o -u 0.058278,0.919904,0.387789 -w ibex-sun -t 2020/06:24:06:07:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.058278,+0.919904,+0.387789
which is R.A. +86.375 Decl. +22.817
missing R.A. +93.212 Decl. +23.422 (ibex-sun)
error is R.A. +6.837 Decl. +0.605
for a total 6.316 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 492 apogee:
ibex_rotate -o -u -0.019289,0.920861,0.389413 -w ibex-sun -t 2020/06:24:09:02:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.019289,+0.920861,+0.389413
which is R.A. +91.200 Decl. +22.918
missing R.A. +93.331 Decl. +23.414 (ibex-sun)
error is R.A. +2.131 Decl. +0.496
for a total 2.021 deg
ibex_rotate -o -u -0.019289,0.920861,0.389413 -w ibex-sun -t 2020-06-29T04:59:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.019289,+0.920861,+0.389413
which is R.A. +91.200 Decl. +22.918
missing R.A. +98.326 Decl. +23.227 (ibex-sun)
error is R.A. +7.126 Decl. +0.309
for a total 6.562 deg
No Lo O-mode.
There is no overlap with orbit 490 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi<https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fibex.unh.edu%2Fcgi-bin%2Fats.cgi&data=02%7C01%7Ccarol.weaver%40unh.edu%7Ceb53072b41ce42dd965908d7f85415e7%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C637250913249213389&sdata=BBXI7AUSMt5351TmJ15P9Jja1LRAEZKT%2FNscmU47tKs%3D&reserved=0>.
Command approval checklist is attached.
Thanks,
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>
Date: Wednesday, 20 May 2020 at 14:53
To: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin at ngc.com>, "Heirtzler, David" <David.Heirtzler at unh.edu>, IBEX FDG <IBEX at applieddefense.info>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, "Ken Fairchild (kwfairchild at gmail.com)" <kwfairchild at gmail.com>, Nigel Angold <nigel.angold at nasa.gov>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <paul.janzen at umontana.edu>, "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>, "Tyler, Ryan S [US] (IS)" <Ryan.Tyler at ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley at ngc.com>, "Wynn, Reese [US] (IS)" <Reese.Wynn at ngc.com>
Subject: IBEX Orbit #491 ATS Approval ( 15 - 25 June2020 )
Caution - External Email
All,
Attached are the planning files for Orbit #491
Please respond to this thread with comments and approvals.
Approvals are required by COB on 23 May 2020
Please note the following:
1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
1. The 3 ATS files have been changed to word docx files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.
1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
1. Battery Balancing this orbit
# Orbit 491 Battery Balancing
# 2020-06-24T16:44:42.846Z,Perigee,orbit:491
@ECT_SetLongEclipseFlag TRUE $TIME=2020/06:24:16:30:00
@ECT_SetLongEclipseFlag FALSE $TIME=2020/06:24:18:00:00
1. Eclipse- No eclipse commands are necessary
2020-06-19T07:42:20.486Z,PenumbraEntry,orbit:491
2020-06-19T07:42:20.486Z,EclipseEntry,moderate:true,long:false,orbit:491
2020-06-19T10:15:08.307Z,PenumbraExit,orbit:491
2020-06-19T10:15:08.307Z,EclipseExit,moderate:true,long:false,orbit:491
1. Command Load Constraint Violation Report (CCVR)
IBEX_2020_167_o0491a_v001.ccvr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-015: Battery charge falls below minimum from 2020/06/19 08:32:20 UTC -
2020/06/19 15:46:11 UTC. Lowest charge level is 0.000000
watt-minutes during this interval.
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/06/15 20:34:59 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/06/19 18:11:25 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com
Office (703) 406-5976
Cell (301) 606-1430
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