[Isocops] IBEX Orbit #522 ATS Approval (25 Mar – 3 Apr 21)
Weaver, Carol
Carol.Weaver at unh.edu
Sun Mar 14 17:25:11 EDT 2021
Hi all,
I have looked at the orbit 521 ATS files,
IBEX_2021_083_o0522a_INST_V001.scr, IBEX_2021_083_o0522a_BUS_V001.scr
and I approve.
The constraint violations in
IBEX_2021_083_o0522a_BUS_v001.ccvr and IBEX_2021_083_o0522a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the transmissions on 2021-04-02/2021-04-03 being less than the required time apart. The violations are acceptable.
The PL commands in IBEX_2021_083_o0522a_INST_V001.scr
match those in the v002 STF, IBEX_2021_083_o0522a_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 from the OEF,
IBEX_2021_083_o0522a_BUS_v001.oef
and as verified with ibex_orbit.
There is one star tracker outage shortly after perigee and lasting for ~34 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit522_Contacts.txt,
for all contacts (4) and reset master timer in Orbit 520.
We are doing battery cell balancing this orbit and it is appropriately placed.
The inertial precession maneuver at perigee of orbit 521 left us pointing in safe directions for the orbit 522 arc A ascending and descending sequences:
ibex_rotate -o -u 0.999417,0.033783,0.004869 -w ibex-sun -t 2021/03:25:08:29:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999417,+0.033783,+0.004869
which is R.A. +1.936 Decl. +0.279
missing R.A. +4.233 Decl. +1.810 (ibex-sun)
error is R.A. +2.297 Decl. +1.531
for a total 2.760 deg
ibex_rotate -o -u 0.999417,0.033783,0.004869 -w ibex-sun -t 2021/03:28:23:33:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999417,+0.033783,+0.004869
which is R.A. +1.936 Decl. +0.279
missing R.A. +7.638 Decl. +3.304 (ibex-sun)
error is R.A. +5.702 Decl. +3.025
for a total 6.452 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 0.993767,0.105852,0.034969 -w ibex-sun -t 2021/03:29:01:16:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993767,+0.105852,+0.034969
which is R.A. +6.080 Decl. +2.004
missing R.A. +7.703 Decl. +3.333 (ibex-sun)
error is R.A. +1.623 Decl. +1.329
for a total 2.097 deg
ibex_rotate -o -u 0.993767,0.105852,0.034969 -w ibex-sun -t 2021/03:29:02:51:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993767,+0.105852,+0.034969
which is R.A. +6.080 Decl. +2.004
missing R.A. +7.764 Decl. +3.360 (ibex-sun)
error is R.A. +1.684 Decl. +1.356
for a total 2.160 deg
ibex_rotate -o -u 0.993767,0.105852,0.034969 -w ibex-sun -t 2021/04:02:13:30:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993767,+0.105852,+0.034969
which is R.A. +6.080 Decl. +2.004
missing R.A. +11.694 Decl. +5.037 (ibex-sun)
error is R.A. +5.614 Decl. +3.033
for a total 6.371 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 523 apogee:
ibex_rotate -o -u 0.981968,0.176826,0.066866 -w ibex-sun -t 2021/04:02:22:08:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.981968,+0.176826,+0.066866
which is R.A. +10.208 Decl. +3.834
missing R.A. +12.016 Decl. +5.156 (ibex-sun)
error is R.A. +1.808 Decl. +1.322
for a total 2.235 deg
ibex_rotate -o -u 0.981968,0.176826,0.066866 -w ibex-sun -t 2021-04-07T13:44:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.981968,+0.176826,+0.066866
which is R.A. +10.208 Decl. +3.834
missing R.A. +16.383 Decl. +6.983 (ibex-sun)
error is R.A. +6.175 Decl. +3.149
for a total 6.906 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 521 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Date: Thursday, 2021-March-11 at 12:58
To: Weaver, Carol <Carol.Weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Heirtzler, David <David.Heirtzler at unh.edu>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, IBEXOPS at gmail.com <IBEXOPS at gmail.com>, isocops at lists.sr.unh.edu <isocops at lists.sr.unh.edu>, fair-play at comcast.net <fair-play at comcast.net>, kwfairchild at gmail.com <kwfairchild at gmail.com>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>
Subject: IBEX Orbit #522 ATS Approval (25 Mar – 3 Apr 21)
Caution - External Email
All,
Attached are the planning files for Orbit #522
Please respond to this thread with comments and approvals.
Approvals are required by COB on 14 March 2021
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 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
Begin 2021/04:03:00:30:00 – End 2021/04:03:02:00:00
1. # Orbit# 520 Reset Master Timer - 2021/03:16:04:15:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_083_o0522a_v001.ccvr
# Input files: 1
# IBEX_2021_083_o0522a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
The 2 IBX-CLC-006 violations are acceptable
IBX-CLC-006: Planned transmission at 2021/04/02 23:03:00 UTC - 2021/04/03
00:07:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-006: Planned transmission at 2021/04/03 02:28:00 UTC - 2021/04/03
03:32:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/25 05:28:56 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/29 02:21:40 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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