[Isocops] IBEX Orbit #497 ATS Approval ( 9 - 19 Aug 2020 ) - v002 approval
KEN FAIRCHILD
fair-play at comcast.net
Thu Jul 30 16:54:15 EDT 2020
All,
I have looked at the orbit 497 ATS files,
IBEX_2020_222_o0497a_BUS_v002.scr
and
IBEX_2020_222_o0497a_INST_v002.scr,
and I approve.
The only constraint violations in
IBEX_2020_222_o0497a_BUS_v001.ccvr
and
IBEX_2020_222_o0497a_INST_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of contacts; the violations are expected.
The PL commands in
IBEX_2020_222_o0497a_INST_v002.scr
match those in the v002 STF,
IBEX_2020_222_o0497a_v002.stf
except the ATS contains an
SSR_DUMP_ NEW
command. This is expected as APL is being used for the dump pass.
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_222_o0497_BUS_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit497_Contacts.txt,
for all contacts (4).
We are dong 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 496 left us pointing in safe directions for the orbit 497 arc A ascending and descending sequences:
ibex_rotate -o -u -0.705841,0.653433,0.273523 -w ibex-sun -t 2020/08:09:23:02:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.705841,+0.653433,+0.273523
which is R.A. +137.208 Decl. +15.874
missing R.A. +139.954 Decl. +15.566 (ibex-sun)
error is R.A. +2.746 Decl. +0.308
for a total 2.661 deg
ibex_rotate -o -u -0.705841,0.653433,0.273523 -w ibex-sun -t 2020/08:13:20:33:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.705841,+0.653433,+0.273523
which is R.A. +137.208 Decl. +15.874
missing R.A. +143.563 Decl. +14.445 (ibex-sun)
error is R.A. +6.355 Decl. +1.429
for a total 6.298 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 -0.75853,0.601785,0.249974 -w ibex-sun -t 2020/08:13:22:17:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.758530,+0.601785,+0.249974
which is R.A. +141.573 Decl. +14.476
missing R.A. +143.632 Decl. +14.423 (ibex-sun)
error is R.A. +2.059 Decl. +0.053
for a total 1.994 deg
ibex_rotate -o -u -0.75853,0.601785,0.249974 -w ibex-sun -t 2020/08:13:23:52:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.758530,+0.601785,+0.249974
which is R.A. +141.573 Decl. +14.476
missing R.A. +143.695 Decl. +14.404 (ibex-sun)
error is R.A. +2.122 Decl. +0.072
for a total 2.056 deg
ibex_rotate -o -u -0.75853,0.601785,0.249974 -w ibex-sun -t 2020/08:18:17:08:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.758530,+0.601785,+0.249974
which is R.A. +141.573 Decl. +14.476
missing R.A. +148.215 Decl. +12.873 (ibex-sun)
error is R.A. +6.642 Decl. +1.603
for a total 6.650 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 498 apogee:
ibex_rotate -o -u -0.808309,0.543673,0.225954 -w ibex-sun -t 2020/08:18:21:48:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.808309,+0.543673,+0.225954
which is R.A. +146.075 Decl. +13.059
missing R.A. +148.388 Decl. +12.804 (ibex-sun)
error is R.A. +2.313 Decl. +0.255
for a total 2.268 deg
ibex_rotate -o -u -0.808309,0.543673,0.225954 -w ibex-sun -t 2020-08-23T15:26:50.592Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.808309,+0.543673,+0.225954
which is R.A. +146.075 Decl. +13.059
missing R.A. +152.659 Decl. +11.275 (ibex-sun)
error is R.A. +6.584 Decl. +1.784
for a total 6.678 deg
Lo Background mode for the entire orbit.
There is no overlap with orbit 496 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 07/27/2020 4:14 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #497
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by 1800 on 30 July 2020
>
> Password is the usual one.
>
>
> 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
>
> # Orbit 497 Battery Balancing
>
> # 2020-08-19T01:15:22.583Z,Perigee,orbit:497
>
> Set Long Eclipse Flag to TRUE $TIME=2020/08:19:00:30:00
>
> Set Long Eclipse Flag to FALSE $TIME=2020/08:19:02:00:00
>
>
> 5. # Orbit# 495 Reset Master Timer - 2020/07:31:11:45:00
>
>
> 1. APL Contact
>
> 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
>
> IBEX,APL-18,ADD,2020-08-18,231,14:00:00,2020-08-18,231,15:00:00,, LAHO 2K-360k Orbit# 497 SSR_Dump Contact Perigee
>
>
> 7. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_222_o0497a_v001.ccvr
>
> The 2 IBX-CLC-006 violations are acceptable. The reason for the 2violations is because the 2 contacts are within 5 hours of each other. There is 1 hour separation between the 2 contacts and that is plenty of time for the transmitter to cool down.
>
>
> # Input files: 1
>
> # IBEX_2020_222_o0497a_v001.scr
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2020/08/18 13:58:00 UTC - 2020/08/18
>
> 15:02:00 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 2020/08/18 16:58:00 UTC - 2020/08/18
>
> 18:02:00 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 2020/08/09 19:06:08 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/08/13 23:22:10 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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