[Isocops] IBEX Orbit #529 ATS Approval (28 May - 06 June, 2021)
Weaver, Carol
Carol.Weaver at unh.edu
Mon May 17 14:39:33 EDT 2021
Hi all,
I have looked at the orbit 0529 ATS files, IBEX_2021_148_o0529a_BUS_v001.scr, IBEX_2021_148_o0529a_INST_v001.scr and I approve.
The constraint violations in IBEX_2021_148_o0529a_BUS_v001.ccvr and IBEX_2021_148_o0529a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_148_o0529a_INST_v001.scr match those in the STF, IBEX_2021_148_o0529a_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_148_o0529a_BUS_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. Outage lasts for ~10 hours and ends ~45 minutes before perigee maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit529_Contacts.txt for all contacts (4).
No Battery Balancing this orbit
The Inertial maneuver at perigee of orbit 0528 left us pointing in safe directions for the orbit 0529 arc A ascending and descending sequences:
ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021/05:28:17:40:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.426961,+0.833207,+0.351384
which is R.A. +62.868 Decl. +20.572
missing R.A. +65.480 Decl. +21.505 (ibex-sun)
error is R.A. +2.612 Decl. +0.933
for a total 2.610 deg
ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021/06:01:11:21:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.426961,+0.833207,+0.351384
which is R.A. +62.868 Decl. +20.572
missing R.A. +69.341 Decl. +22.082 (ibex-sun)
error is R.A. +6.473 Decl. +1.510
for a total 6.215 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 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:01:13:05:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.357707,+0.860733,+0.362194
which is R.A. +67.433 Decl. +21.235
missing R.A. +69.416 Decl. +22.093 (ibex-sun)
error is R.A. +1.983 Decl. +0.858
for a total 2.033 deg
ibex_rotate -o -u 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:01:14:40:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.357707,+0.860733,+0.362194
which is R.A. +67.433 Decl. +21.235
missing R.A. +69.485 Decl. +22.103 (ibex-sun)
error is R.A. +2.052 Decl. +0.868
for a total 2.095 deg
ibex_rotate -o -u 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:06:03:32:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.357707,+0.860733,+0.362194
which is R.A. +67.433 Decl. +21.235
missing R.A. +74.144 Decl. +22.650 (ibex-sun)
error is R.A. +6.711 Decl. +1.415
for a total 6.383 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0530 apogee:
ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021/06:06:15:22:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.283804,+0.883311,+0.373117
which is R.A. +72.188 Decl. +21.908
missing R.A. +74.619 Decl. +22.675 (ibex-sun)
error is R.A. +2.431 Decl. +0.767
for a total 2.377 deg
ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021-06-11T04:59:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.283804,+0.883311,+0.373117
which is R.A. +72.188 Decl. +21.908
missing R.A. +79.370 Decl. +23.089 (ibex-sun)
error is R.A. +7.182 Decl. +1.181
for a total 6.739 deg
There is no overlap with orbit 0528 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Date: Friday, 2021-May-14 at 17:40
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>, Fairchild, Kenneth <Ken.Fairchild at unh.edu>, 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 #529 ATS Approval (28 May - 06 June, 2021)
Caution - External Email
All,
Attached are the planning files for Orbit #529. Please respond to this thread with comments and approvals.
Approvals are required by COB on 17 May 2021.
Please note the following:
1. I have 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
None
1. Orbit# 527 Reset Master Timer - 2021/05:19:15:45:00
1. APL Contact 2021-06-06/12:00:00 - 2021-06-06/13:00:00
Just a reminder for the APL contact. We start off at 2k D\L, after 5 minutes we switch to 320k D\L, Then 5 minutes later we start the SSR Dump with Dump New command
1. Command Load Constraint Violation Report (CCVR)
Filename: IBEX_2021_148_o0529a_v001.ccvr
# File type: Command Load Constraint Violation Report (CCVR)
#
# Create time: 2021/134.182455
# Plan period start: 2021/148.030000
# Plan period stop: 2021/157.215500
# Default time format: UTC
#
# Input files: 1
# IBEX_2021_148_o0529a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/05/28 14:41:44 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/06/01 14:10:10 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Sheral Wesley | Principal Engineer, Satellite Systems
Northrop Grumman Corporation | Space Systems
O: 703-406-5641 | C: 202-236-0802 | sheral.wesley at ngc.com<mailto:sheral.wesley at ngc.com>
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