[Isocops] IBEX Orbit #500 ATS Approval ( 6 - 16 September 2020) - v001/v002 approval
KEN FAIRCHILD
fair-play at comcast.net
Sat Aug 22 23:53:50 EDT 2020
All,
I have looked at the orbit 500 ATS files,
IBEX_2020_250_o0500a_BUS_v001.scr
and
IBEX_2020_250_o0500a_INST_v002.scr,
and I approve.
The only constraint violations in
IBEX_2020_250_o0500a_BUS_v001.ccvr
and
IBEX_2020_250_o0500a_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_250_o0500a_INST_v002.scr
match those in the v002 STF,
IBEX_2020_250_o0500a_v002.stf.
Ascending and descending command sequences are consistent with each other, 16 Re ascending, the apogee maneuver time and 16 Re descending as determined from the OEF,
IBEX_2020_250_o0500a_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_Orbit500_Contacts.txt,
for all contacts (4) (perigee contacts are 64K -> 160K).
We are doing 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 499 left us pointing in safe directions for the orbit 500 arc A ascending and descending sequences:
ibex_rotate -o -u -0.949439,0.291487,0.116619 -w ibex-sun -t 2020/09:06:21:45:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949439,+0.291487,+0.116619
which is R.A. +162.933 Decl. +6.697
missing R.A. +165.695 Decl. +6.092 (ibex-sun)
error is R.A. +2.762 Decl. +0.605
for a total 2.811 deg
ibex_rotate -o -u -0.949439,0.291487,0.116619 -w ibex-sun -t 2020/09:10:17:12:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949439,+0.291487,+0.116619
which is R.A. +162.933 Decl. +6.697
missing R.A. +169.024 Decl. +4.724 (ibex-sun)
error is R.A. +6.091 Decl. +1.973
for a total 6.373 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 -0.971191,0.222433,0.085504 -w ibex-sun -t 2020/09:10:18:55:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.971191,+0.222433,+0.085504
which is R.A. +167.100 Decl. +4.905
missing R.A. +169.089 Decl. +4.698 (ibex-sun)
error is R.A. +1.989 Decl. +0.207
for a total 1.993 deg
ibex_rotate -o -u -0.971191,0.222433,0.085504 -w ibex-sun -t 2020/09:10:20:30:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.971191,+0.222433,+0.085504
which is R.A. +167.100 Decl. +4.905
missing R.A. +169.149 Decl. +4.674 (ibex-sun)
error is R.A. +2.049 Decl. +0.231
for a total 2.055 deg
ibex_rotate -o -u -0.971191,0.222433,0.085504 -w ibex-sun -t 2020/09:15:11:53:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.971191,+0.222433,+0.085504
which is R.A. +167.100 Decl. +4.905
missing R.A. +173.442 Decl. +2.849 (ibex-sun)
error is R.A. +6.342 Decl. +2.056
for a total 6.653 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 501 apogee:
ibex_rotate -o -u -0.987191,0.149704,0.055159 -w ibex-sun -t 2020/09:15:15:59:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987191,+0.149704,+0.055159
which is R.A. +171.377 Decl. +3.162
missing R.A. +173.594 Decl. +2.776 (ibex-sun)
error is R.A. +2.217 Decl. +0.386
for a total 2.248 deg
ibex_rotate -o -u -0.987191,0.149704,0.055159 -w ibex-sun -t 2020-09-20T11:49:39.521Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987191,+0.149704,+0.055159
which is R.A. +171.377 Decl. +3.162
missing R.A. +177.796 Decl. +0.969 (ibex-sun)
error is R.A. +6.419 Decl. +2.193
for a total 6.779 deg
Lo Background mode for the entire orbit.
There is no overlap with orbit 499 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 08/21/2020 1:08 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #500
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 22 August 2020
>
>
> 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 500 Battery Balancing
>
> # 2020-09-15T21:49:27.616Z,Perigee,orbit:500
>
> Begin -2020/09:15:21:00 End - 2020/09:15:22:30:00
>
>
> 5. # Orbit# 498 Reset Master Timer - 2020/08:28:14:45:00
>
>
> 6. Perigee Contacts data rate has changed from 160k to 64k in MPS. Considering we have been able to change the data rate from 64k to 160k in the past couple orbits. I decided to plan with the initial data rate of 64k and we will change it to 160k at AOS. Below are the 2 contacts in question.
>
> IBEX,USHI01,ADD,09/15/20,259,10:00:00,09/15/20,259,11:00:00,LAHO 160K IBEX-2 Orbit# 500 Begin Hi Background Test Contact 16Desc
>
> IBEX,USHI01,ADD,09/15/20,259,12:00:00,09/15/20,259,13:00:00,LAHO 160K IBEX-2 Orbit# 500 SSR_Dump/Tracking Contact 16Desc
>
>
> 7. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_250_o0500a_v001.ccvr
>
> The 2 IBX-CLC-006 violations are acceptable.
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2020/09/15 09:58:00 UTC - 2020/09/15
>
> 11:02:00 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 2020/09/15 11:58:00 UTC - 2020/09/15
>
> 13:02:00 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 2020/09/06 18:21:32 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/09/10 20:00:59 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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