[Isocops] IBEX Orbit #530 ATS Approval (06 June, 2021 - 15 June, 2021) - v002 approval
fair-play at comcast.net
fair-play at comcast.net
Thu May 27 20:50:01 EDT 2021
All,
I have looked at the orbit 530 ATS files,
IBEX_2021_157_o0530a_BUS_v002.scr
and
IBEX_2021_157_o0530a_INST_v002.scr,
and I approve.
The only constraint violations in
IBEX_2021_157_o0530a_BUS_v002.ccvr
and
IBEX_2021_157_o0530a_INST_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the eclipse; the violations are expected.
The PL commands in
IBEX_2021_157_o0530a_INST_v002.scr
match those in the v003 STF,
IBEX_2021_157_o0530a_v003.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_157_o0530a_BUS_v002.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 2 hours after 15 Re descending and runs for about 10 hours. No despinning should 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_Orbit530_Contacts.txt,
for all contacts (3).
There is an eclipse late in arc A so we aren't doing battery cell balancing. The timing of the long eclipse flag commands matches Ryan's recommendations; they were relative to the eclipse start and end.
The inertial precession maneuver at perigee of orbit 529 left us pointing in safe directions for the orbit 530 arc A ascending and descending sequences:
ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021/06:06:21:55:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.283804,+0.883311,+0.373117
which is R.A. +72.188 Decl. +21.908
missing R.A. +74.886 Decl. +22.691 (ibex-sun)
error is R.A. +2.698 Decl. +0.783
for a total 2.616 deg
ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021/06:10:17:23:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.283804,+0.883311,+0.373117
which is R.A. +72.188 Decl. +21.908
missing R.A. +78.859 Decl. +23.046 (ibex-sun)
error is R.A. +6.671 Decl. +1.138
for a total 6.268 deg
The inertial precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for the arc B ascending and descending sequences:
ibex_rotate -o -u 0.209806,0.901019,0.379666 -w ibex-sun -t 2021/06:10:19:06:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209806,+0.901019,+0.379666
which is R.A. +76.892 Decl. +22.313
missing R.A. +78.935 Decl. +23.053 (ibex-sun)
error is R.A. +2.043 Decl. +0.740
for a total 2.025 deg
ibex_rotate -o -u 0.209806,0.901019,0.379666 -w ibex-sun -t 2021/06:10:20:42:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209806,+0.901019,+0.379666
which is R.A. +76.892 Decl. +22.313
missing R.A. +79.005 Decl. +23.059 (ibex-sun)
error is R.A. +2.113 Decl. +0.746
for a total 2.087 deg
ibex_rotate -o -u 0.209806,0.901019,0.379666 -w ibex-sun -t 2021/06:15:11:29:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209806,+0.901019,+0.379666
which is R.A. +76.892 Decl. +22.313
missing R.A. +83.816 Decl. +23.328 (ibex-sun)
error is R.A. +6.924 Decl. +1.015
for a total 6.461 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 531 apogee:
ibex_rotate -o -u 0.131669,0.913039,0.386035 -w ibex-sun -t 2021/06:16:00:21:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.131669,+0.913039,+0.386035
which is R.A. +81.794 Decl. +22.708
missing R.A. +84.335 Decl. +23.324 (ibex-sun)
error is R.A. +2.541 Decl. +0.616
for a total 2.418 deg
ibex_rotate -o -u 0.131669,0.913039,0.386035 -w ibex-sun -t 2021-06-20T10:39:13.433Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.131669,+0.913039,+0.386035
which is R.A. +81.794 Decl. +22.708
missing R.A.+88.950 Decl. +23.446 (ibex-sun)
error is R.A. +7.156 Decl. +0.738
for a total 6.624 deg
Lo Normal mode for the the entire orbit.
There is no overlap with orbit 529 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 05/25/2021 7:15 PM Wesley, Sheral R [US] (SP) <sheral.wesley at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #530. Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 27 May 2021.
>
>
>
> Please note the following:
>
> 1. I have 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
>
> None
>
>
>
> 1. Orbit# 528 Reset Master Timer - 2021/05:28:19:45:00
>
>
>
> 6. Orbit# 530 Moderate Eclipse
>
> # 2021-06-10T10:36:22.921Z,PenumbraEntry,orbit:530
>
> # 2021-06-10T10:36:22.921Z,EclipseEntry,moderate:true,long:false,orbit:530
>
> # 2021-06-10T14:05:57.215Z,PenumbraExit,orbit:530
>
> # 2021-06-10T14:05:57.215Z,EclipseExit,moderate:true,long:false,orbit:530
>
> SetLongEclipseFlag TRUE $TIME=2021/06:10:09:30:00
>
> SetLongEclipseFlag FALSE $TIME=2021/06:10:14:30:00
>
>
>
>
>
> 1. Command Load Constraint Violation Report (CCVR)
>
> Filename: IBEX_2021_157_o0530a_v002.ccvr
>
> # File type: Command Load Constraint Violation Report (CCVR)
>
> #
>
> # Create time: 2021/145.213405
>
> # Plan period start: 2021/157.130500
>
> # Plan period stop: 2021/167.040000
>
> # Default time format: UTC
>
> #
>
> # Input files: 1
>
> # IBEX_2021_157_o0530a_BUS_v002.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-015: Battery charge falls below minimum from 2021/06/10 12:17:22 UTC -
>
> 2021/06/16 00:21:05 UTC. Lowest charge level is 0.000000
>
> watt-minutes during this interval.
>
>
>
> *NOTE the Following*
>
> # Orbit# 530 Moderate Eclipse
>
> # 2021-06-10T10:36:22.921Z,PenumbraEntry,orbit:530
>
> # 2021-06-10T10:36:22.921Z,EclipseEntry,moderate:true,long:false,orbit:530
>
> # 2021-06-10T14:05:57.215Z,PenumbraExit,orbit:530
>
> # 2021-06-10T14:05:57.215Z,EclipseExit,moderate:true,long:false,orbit:530
>
> # SetLongEclipseFlag TRUE $TIME=2021/06:10:09:30:00
>
> # SetLongEclipseFlag FALSE $TIME=2021/06:10:14:30:00
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
>
>
> Sheral Wesley | Sr Principal Engineer, Satellite Systems
>
> Northrop Grumman Corporation | Space Systems
>
> O: 703-406-5641 | C: 202-236-0802 | sheral.wesley at ngc.com mailto:sheral.wesley at ngc.com
>
> [cid:image001.gif at 01D6F978.AF320150]
>
>
>
>
>
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