[Isocops] IBEX Orbit #514 ATS Approval (11 -20 Jan 21) - v001 approval

fair-play at comcast.net fair-play at comcast.net
Fri Jan 1 12:57:31 EST 2021 

All,

I have looked at the orbit 514 ATS files,

IBEX_2021_011_o0514a_BUS_v001.scr

and

IBEX_2021_011_o0514a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2021_011_o0514a_BUS_v001.ccvr

and

IBEX_2021_011_o0514a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2021_011_o0514a_INST_v001.scr

match those in the v002 STF,

IBEX_2021_011_o0514a_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_011_o0514a_BUS_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts ~5 hours before apogee and runs for 2+ days.  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_Orbit514_Contacts.txt,

for all contacts (4).

We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.

The inertial precession maneuver at perigee of orbit 513 left us pointing in safe directions for the orbit 514 arc A ascending and descending sequences:

ibex_rotate -o -u 0.379947,-0.844631,-0.377146 -w ibex-sun -t 2021/01:11:21:49:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.379947,-0.844631,-0.377146
which is R.A. +294.220 Decl. -22.157
missing R.A. +293.387 Decl. -21.719 (ibex-sun)
error is R.A. +0.833 Decl. +0.438
for a total 0.888 deg

ibex_rotate -o -u 0.379947,-0.844631,-0.377146 -w ibex-sun -t 2021/01:15:02:22:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.379947,-0.844631,-0.377146
which is R.A. +294.220 Decl. -22.157
missing R.A. +296.858 Decl. -21.143 (ibex-sun)
error is R.A. +2.638 Decl. +1.014
for a total 2.653 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 0.451394,-0.815041,-0.363251 -w ibex-sun -t 2021/01:15:04:05:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.451394,-0.815041,-0.363251
which is R.A. +298.979 Decl. -21.300
missing R.A. +296.933 Decl. -21.129 (ibex-sun)
error is R.A. +2.046 Decl. +0.171
for a total 1.915 deg

ibex_rotate -o -u 0.451394,-0.815041,-0.363251 -w ibex-sun -t 2021/01:15:05:41:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.451394,-0.815041,-0.363251
which is R.A. +298.979 Decl. -21.300
missing R.A. +297.003 Decl. -21.116 (ibex-sun)
error is R.A. +1.976 Decl. +0.184
for a total 1.851 deg

ibex_rotate -o -u 0.451394,-0.815041,-0.363251 -w ibex-sun -t 2021/01:19:23:12:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.451394,-0.815041,-0.363251
which is R.A. +298.979 Decl. -21.300
missing R.A. +301.957 Decl. -20.177 (ibex-sun)
error is R.A. +2.978 Decl. +1.123
for a total 3.003 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 515 apogee:

ibex_rotate -o -u 0.52143,-0.778814,-0.348654 -w ibex-sun -t 2021/01:20:02:18:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.521430,-0.778814,-0.348654
which is R.A. +303.803 Decl. -20.405
missing R.A. +302.100 Decl. -20.154 (ibex-sun)
error is R.A. +1.703 Decl. +0.251
for a total 1.617 deg

ibex_rotate -o -u 0.52143,-0.778814,-0.348654 -w ibex-sun -t 2021-01-24T22:31:23.376Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.521430,-0.778814,-0.348654
which is R.A. +303.803 Decl. -20.405
missing R.A. +307.282 Decl. -19.016 (ibex-sun)
error is R.A. +3.479 Decl. +1.389
for a total 3.557 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 513 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Ken

>     On 12/24/2020 9:35 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>      
>      
> 
>     All,
> 
>        Attached are the planning files for Orbit #514
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 1 January 2021
> 
>      
> 
>     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. No Battery Balancing this orbit
> 
>      
> 
>     5.       # Orbit# 512 Reset Master Timer  - 2021/01:02:21:45:00
> 
>      
> 
>     6.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2021_011_o0514a_v001.ccvr
> 
>          
> 
>         ==========================
> 
>         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 2021/01/11 19:42:01 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2021/01/15 05:11:01 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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