[Isocops] IBEX Orbit# 415 ATS Approval (27 Jul 18 - 5 Aug 18) - v001 approval

Ken Fairchild fair-play at comcast.net
Tue Jul 17 22:48:05 EDT 2018


All,


I have looked at the orbit 415 ATS,


IBEX_2018_208_o0415a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_208_o0415a_v001_.ccvr


are from the removal of the


ACT_SetSpinPulseProtectEnable Enable


commands (2); the violations are expected.


The PL commands in the v001 ATS match those in the v002 STF,


IBEX_2018_208_o0415a_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_2018_208_o0415a_v001.oef,


and as verified with ibex_orbit.


There are 2 star tracker outages.  The first outage starts in orbit 414 and ends about 9 1/2 hours after 15 Re ascending.  The second starts 1+ hours before perigee and runs for 7+ hours.  Some despinning may be required due to the first outage.


There is one moon in Lo FOV session.  It starts in arc A and ends in arc B.  The ATS start time is 5 hours after that in the OEF and the ATS end time is about 5 hours before that in the OEF.  These differences are not unusual.


The ground station command sequences are correct and the timing and bit rates match those in the contacts file,


IBEX_Orbit415_Contacts.txt,


for all contacts (3).


We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.


The sun precession maneuver at perigee of orbit 414 left us pointing in safe directions for the orbit 415 arc A ascending and descending sequences:


ibex_rotate -o -r +125.784 -d +19.397 -w ibex-sun -t 2018/07:27:14:23:49

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.551542,+0.765182,+0.332112

which is R.A. +125.784 Decl. +19.397

missing R.A. +126.560 Decl. +19.175 (ibex-sun)

error is R.A. +0.776 Decl. +0.222

for a total 0.765 deg


ibex_rotate -o -r +125.784 -d +19.397 -w ibex-sun -t 2018/07:31:04:54:33

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.551542,+0.765182,+0.332112

which is R.A. +125.784 Decl. +19.397

missing R.A. +130.070 Decl. +18.337 (ibex-sun)

error is R.A. +4.286 Decl. +1.060

for a total 4.192 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 -0.585219,0.747996,0.313081 -w ibex-sun -t 2018/07:31:06:37:41

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.585219,+0.747996,+0.313081

which is R.A. +128.039 Decl. +18.245

missing R.A. +130.141 Decl. +18.320 (ibex-sun)

error is R.A. +2.102 Decl. +0.075

for a total 1.997 deg


ibex_rotate -o -u -0.585219,0.747996,0.313081 -w ibex-sun -t 2018/07:31:08:12:47

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.585219,+0.747996,+0.313081

which is R.A. +128.039 Decl. +18.245

missing R.A. +130.207 Decl. +18.304 (ibex-sun)

error is R.A. +2.168 Decl. +0.059

for a total 2.059 deg


ibex_rotate -o -u -0.585219,0.747996,0.313081 -w ibex-sun -t 2018/08:04:19:02:01

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.585219,+0.747996,+0.313081

which is R.A. +128.039 Decl. +18.245

missing R.A. +134.595 Decl. +17.180 (ibex-sun)

error is R.A. +6.556 Decl. +1.065

for a total 6.335 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 416 apogee:


ibex_rotate -o -u -0.646303,0.703736,0.295041 -w ibex-sun -t 2018/08:04:21:36:14

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.646303,+0.703736,+0.295041

which is R.A. +132.564 Decl. +17.160

missing R.A. +134.695 Decl. +17.149 (ibex-sun)

error is R.A. +2.131 Decl. +0.011

for a total 2.036 deg


ibex_rotate -o -u -0.646303,0.703736,0.295041 -w ibex-sun -t 2018-08-09T22:18:05.664Z

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.646303,+0.703736,+0.295041

which is R.A. +132.564 Decl. +17.160

missing R.A. +139.417 Decl. +15.742 (ibex-sun)

error is R.A. +6.853 Decl. +1.418

for a total 6.723 deg


No Lo O-mode.


There is no overlap with orbit 414 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken                                                                                                                                    



> On July 15, 2018 at 3:36 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here are the planning files and ATS for Orbit# 415.
> 
>     Please respond to this email thread with comments and approvals.
> 
>     Approvals are required before 17 Jul 18 @1600 UTC
> 
>      
> 
>     Note the following
> 
>     1.       Orbit# 415 OEF
> 
>     The OEF was generated using the  Orbit# 413 OEF because of the PERIGEE sun maneuver in Orbit# 414
> 
>      
> 
>     2.       Battery Balancing
> 
>     Orbit# 415 PERIGEE Battery Balancing
> 
>     # 2018-08-05T06:25:52.723Z,Perigee,orbit:415
> 
>     SetLongEclipseFlag TRUE $TIME=2018/08:05:06:00:00
> 
>     SetLongEclipseFlag FALSE $TIME=2018/08:05:07:30:00
> 
>      
> 
>      
> 
>     3.       Command Load Constraint Violation Report
> 
>     IBEX_2018_208_o0415a_v001.scr
> 
>      
> 
>     ==========================
> 
>     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 2018/07/27 12:41:32 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/07/31 07:42:47 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>     Sheral  R. Wesley
> 
>     Sr Systems Engineer
> 
>     IBEX , OCO2 Mission OPS
> 
>     CRS/CYGNUS Mission Planning
> 
>     Northrop Grumman Innovation Systems
> 
>     Bldg. 2   Room 1337
> 
>     Office (703) 406-5641
> 
>     Cell (202) 236-0802
> 
>      
> 
>      
> 
>      
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
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>     *********************
> 
 
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