I have looked at the orbit 504 ATS files:
IBEX_2020_287_o0504a_INST_v001.scr,
IBEX_2020_287_o0504a_BUS_v001.scr and I approve.
The only constraint violations in IBEX_2020_287_o0504a_INST_v001.ccvr and IBEX_2020_287_o0504a_BUS_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2); the violations are expected.
The PL commands in IBEX_2020_287_o0504a_INST_v001.scr match those in IBEX_2020_287_o0504a_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_2020_287_o0504a_BUS_v001.oef and as verified
with the crossing times report and ibex_orbit.
There are no star tracker outages this orbit.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit504_Contacts.txt for the (3) contacts.
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The intertial precession maneuver at perigee of orbit 503 left us pointing in a safe direction for the orbit 504 arc A ascending and descending sequences:
ibex_rotate -o -u -0.951569,-0.278384,-0.130457 -w ibex-sun -t 2020/10:13:19:47:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.951569,-0.278384,-0.130457
which is R.A. +196.307 Decl. -7.496
missing R.A. +199.098 Decl. -8.090 (ibex-sun)
error is R.A. +2.791 Decl. +0.594
for a total 2.828 deg
ibex_rotate -o -u -0.951569,-0.278384,-0.130457 -w ibex-sun -t 2020/10:17:14:43:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.951569,-0.278384,-0.130457
which is R.A. +196.307 Decl. -7.496
missing R.A. +202.515 Decl. -9.421 (ibex-sun)
error is R.A. +6.208 Decl. +1.925
for a total 6.435 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 -0.924245,-0.346186,-0.161018 -w ibex-sun -t 2020/10:17:15:52:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924245,-0.346186,-0.161018
which is R.A. +200.534 Decl. -9.266
missing R.A. +202.560 Decl. -9.438 (ibex-sun)
error is R.A. +2.026 Decl. +0.172
for a total 2.007 deg
ibex_rotate -o -u -0.924245,-0.346186,-0.161018 -w ibex-sun -t 2020/10:17:17:28:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924245,-0.346186,-0.161018
which is R.A. +200.534 Decl. -9.266
missing R.A. +202.622 Decl. -9.461 (ibex-sun)
error is R.A. +2.088 Decl. +0.195
for a total 2.069 deg
ibex_rotate -o -u -0.924245,-0.346186,-0.161018 -w ibex-sun -t 2020/10:22:04:58:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924245,-0.346186,-0.161018
which is R.A. +200.534 Decl. -9.266
missing R.A. +206.950 Decl. -11.100 (ibex-sun)
error is R.A. +6.416 Decl. +1.834
for a total 6.575 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 505 apogee
ibex_rotate -o -u -0.891973,-0.41113,-0.188033 -w ibex-sun -t 2020/10:22:08:53:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.891973,-0.411130,-0.188033
which is R.A. +204.746 Decl. -10.838
missing R.A. +207.110 Decl. -11.168 (ibex-sun)
error is R.A. +2.364 Decl. +0.330
for a total 2.344 deg
ibex_rotate -o -u -0.891973,-0.41113,-0.188033 -w ibex-sun -t 2020-10-27T02:20:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.891973,-0.411130,-0.188033
which is R.A. +204.746 Decl. -10.838
missing R.A. +211.518 Decl. -12.758 (ibex-sun)
error is R.A. +6.772 Decl. +1.920
for a total 6.901 deg
There commands to set science state and lo science mode overlap with Orbit 503 commands, but that is acceptable. This was found by checking at http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: Nigel Angold <angoldconsulting@earthlink.net>
Date: Monday, 28 September 2020 at 19:32
To: "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com>
Cc: "Weaver, Carol" <Carol.Weaver@unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin@ngc.com>, "Heirtzler, David" <David.Heirtzler@unh.edu>, IBEX FDG <IBEX@applieddefense.info>, IBEX Operations <IBEXOPS@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, Ken Fairchild
<fair-play@comcast.net>, "Ken Fairchild (kwfairchild@gmail.com)" <kwfairchild@gmail.com>, Paul Janzen <paul.janzen@umontana.edu>, "Tyler, Ryan S [US] (IS)" <Ryan.Tyler@ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley@ngc.com>, "Wynn, Reese [US] (IS)"
<Reese.Wynn@ngc.com>
Subject: Re: IBEX Orbit #504 ATS Approval ( 13 Oct 20 - 22 Oct 20)
Caution - External Email
I approve IBEX_2020_287_o0504a_BUS_v001.scr for uplink during the September 30 apogee contact.
I approve IBEX_2020_287_o0504a_INST_v001.scr for uplink when there’s space to store the 46 commands onboard.
Two orbit 504 INST commands (Science State and Lo Science Mode Normal ) overlap with orbit 503 BUS (Tx commands) commands. But that’s ok.
We’ll need to deviate from this uplink cadence in orbit 503 to load the orbit 504 Hi Gain Test ATS.
Thanks,
Nigel
All,
Attached are the planning files for Orbit #504
Please respond to this thread with comments and approvals.
Approvals are required by COB on 29 September 2020
Please note the following:
- 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.
- 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.
- 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.
- Battery Balancing this orbit
Orbit 504 Battery Balancing
# 2020-10-22T13:52:50.533Z,Perigee,orbit:504
Begin 2020/10:22:13:00:00 End 2020/10:22:14:30:00
5. # Orbit# 502 Reset Master Timer 2020/10:04:08:45:00
6. Command Load Constraint Violation Report (CCVR)
IBEX_2020_287_o0504a_v001.ccvr
# Input files: 1
# IBEX_2020_287_o0504a_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 2020/10/13 14:44:35 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/10/17 16:58:14 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
Office (703) 406-5976
Cell (301) 606-1430
<image001.png>
<IBEX_2020_287_o0504a_BUS_v001.docx><IBEX_2020_287_o0504a_v001.docx><IBEX-Command-Approval-Checklist-Rev16_F_504_TEP.docx><IBEX_2020_287_o0504a_INST_v001.docx><IBEX_Orbit504_Contacts.txt><IBEX_2020_287_o0504a_BUS_v001.oef><IBEX_2020_287_o0504a_INST_v001.ccvr><IBEX_2020_287_o0504a_INST_v001.oef><IBEX_2020_287_o0504a_v001.ccvr><IBEX_2020_287_o0504a_BUS_v001.ccvr><IBEX_2020_287_o0504a_BUS_v001.docx>