[Isocops] IBEX Orbit #510 ATS Approval (7 – 16 Dec 20) - v001 approval
Ken Fairchild
fair-play at comcast.net
Thu Nov 26 07:46:42 EST 2020
All,
I have looked at the orbit 510 ATS files,
IBEX_2020_341_o0510a_BUS_v001.scr
and
IBEX_2020_341_o0510a_INST_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_341_o0510a_BUS_v002.ccvr
and
IBEX_2020_341_o0510a_INST_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2), the proximity of contacts and the eclipse; all the violations are expected.
The PL commands in
IBEX_2020_341_o0510a_INST_v001.scr
match those in the v002 STF,
IBEX_2020_341_o0510a_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 form the OEF,
IBEX_2020_341_o0510a_BUS_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1.5 days after 15 Re ascending and ends 14+ hours after apogee. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit510_Contacts.txt,
for all contacts (4).
We are not doing battery cell balancing this orbit - there is an eclipse before perigee.
The inertial precession maneuver at perigee of orbit 509 left us pointing in safe directions for the orbit 510 arc A ascending and descending sequences:
ibex_rotate -o -u -0.243102,-0.885897,-0.395081 -w ibex-sun -t 2020/12:07:03:59:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.243102,-0.885897,-0.395081
which is R.A. +254.655 Decl. -23.271
missing R.A. +253.988 Decl. -22.642 (ibex-sun)
error is R.A. +0.667 Decl. +0.629
for a total 0.879 deg
ibex_rotate -o -u -0.243102,-0.885897,-0.395081 -w ibex-sun -t 2020/12:11:23:49:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.243102,-0.885897,-0.395081
which is R.A. +254.655 Decl. -23.271
missing R.A. +259.214 Decl. -23.043 (ibex-sun)
error is R.A. +4.559 Decl. +0.228
for a total 4.198 deg
The inertial 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 -0.16717,-0.900914,-0.400509 -w ibex-sun -t 2020/12:12:01:32:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.167170,-0.900914,-0.400509
which is R.A. +259.488 Decl. -23.610
missing R.A. +259.292 Decl. -23.047 (ibex-sun)
error is R.A. +0.196 Decl. +0.563
for a total 0.591 deg
ibex_rotate -o -u -0.16717,-0.900914,-0.400509 -w ibex-sun -t 2020/12:12:03:07:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.167170,-0.900914,-0.400509
which is R.A. +259.488 Decl. -23.610
missing R.A. +259.364 Decl. -23.051 (ibex-sun)
error is R.A. +0.124 Decl. +0.559
for a total 0.571 deg
ibex_rotate -o -u -0.16717,-0.900914,-0.400509 -w ibex-sun -t 2020/12:15:04:00:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.167170,-0.900914,-0.400509
which is R.A. +259.488 Decl. -23.610
missing R.A. +262.734 Decl. -23.250 (ibex-sun)
error is R.A. +3.246 Decl. +0.360
for a total 3.000 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 511 apogee:
ibex_rotate -o -u -0.087598,-0.909906,-0.405461 -w ibex-sun -t 2020/12:15:06:50:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.087598,-0.909906,-0.405461
which is R.A. +264.501 Decl. -23.920
missing R.A. +262.872 Decl. -23.261 (ibex-sun)
error is R.A. +1.629 Decl. +0.659
for a total 1.632 deg
ibex_rotate -o -u -0.087598,-0.909906,-0.405461 -w ibex-sun -t 2020-12-20T01:41:56.607Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.087598,-0.909906,-0.405461
which is R.A. +264.501 Decl. -23.920
missing R.A. +268.187 Decl. -23.415 (ibex-sun)
error is R.A. +3.686 Decl. +0.505
for a total 3.414 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 509 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 11/19/2020 4:55 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #510
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 26 November 2020
>
>
>
> Please note the following:
>
> 1. Please note that I am moving out the date for sign off to the perigee passes. I plan to uplink the Orbit 509 LGC ATS during the apogee pass on Nov 22.
>
>
>
> 2. The Apogee pass had to be changed. With the new ephemeris the original view period disappeared
>
> IBEX,USHI01,DELETE,12/12/20,347,02:30:00,12/12/20,347,03:05:00,LAHO 2K IBEX-2 Orbit# 510 Apogee Tracking Contact 42re Desc
>
> IBEX,USHI01,ADD,12/13/20,348,00:30:00,12/13/20,348,01:05:00,LAHO 2K IBEX-2 Orbit# 510 Apogee Tracking Contact 42re Desc
>
>
>
> 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.
>
>
>
> 6. Eclipse – Eclipse Duration 2020-12-15T12:37:55.730Z,PenumbraEntry,orbit:510 - 2020-12-15T14:00:41.598Z,PenumbraExit,orbit:510
>
> Long eclipse flag 2020/12:15:10:45:00 True - 2020/12:15:14:10:00 False
>
>
>
> 7. Orbit# 510 Reset Master Timer - 2020/11:28:00:15:00
>
>
>
> 8. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_341_o0510a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2020_341_o0510a_v001.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2020/12/15 10:28:00 UTC - 2020/12/15
>
> 12:02:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> The reason for this violation is that we add 2 minutes before and after the scheduled time. So, the additional 4 minutes creates the violation.
>
> IBEX,USAK01,ADD,12/15/20,350,10:30:00,12/15/20,350,12:00:00,LAHO 64K IBEX-2 Orbit# 510 Pre-Eclipse Monitor Contact 14 Desc
>
>
>
> IBX-CLC-015: Battery charge falls below minimum from 2020/12/06 18:30:00 UTC -
>
> 2020/12/15 23:32:00 UTC. Lowest charge level is 0.000000
>
> watt-minutes during this interval.
>
> I am assuming that this violation is because of the eclipse. I am not sure why the duration is the length of the orbit.
>
>
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/12/07 01:46:26 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/12/12 02:37:37 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
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
>
>
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