All,


I have looked at the orbit 438 ATS,


IBEX_2019_051_o0438a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_051_o0438a_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_2019_051_o0438a_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_2019_051_o0438a_v001.oef,


and as verified with ibex_orbit.


There is one star tracker outage.  The outage starts almost 3 days before orbit 437 15 Re descending and runs for over 7 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_Orbit438_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 437 left us pointing in safe directions for the orbit 438 arc A ascending and descending sequences:


ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019/02:20:14:19:21

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.871117,-0.450676,-0.195056

which is R.A. +332.645 Decl. -11.248

missing R.A. +333.432 Decl. -10.997 (ibex-sun)

error is R.A. +0.787 Decl. +0.251

for a total 0.813 deg


ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019/02:24:12:48:13

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.871117,-0.450676,-0.195056

which is R.A. +332.645 Decl. -11.248

missing R.A. +337.250 Decl. -9.518 (ibex-sun)

error is R.A. +4.605 Decl. +1.730

for a total 4.849 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 0.918417,-0.359184,-0.165822 -w ibex-sun -t 2019/02:24:14:30:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.918417,-0.359184,-0.165822

which is R.A. +338.640 Decl. -9.545

missing R.A. +337.316 Decl. -9.491 (ibex-sun)

error is R.A. +1.324 Decl. +0.054

for a total 1.307 deg


ibex_rotate -o -u 0.918417,-0.359184,-0.165822 -w ibex-sun -t 2019/02:24:16:06:27

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.918417,-0.359184,-0.165822

which is R.A. +338.640 Decl. -9.545

missing R.A. +337.378 Decl. -9.465 (ibex-sun)

error is R.A. +1.262 Decl. +0.080

for a total 1.247 deg


ibex_rotate -o -u 0.918417,-0.359184,-0.165822 -w ibex-sun -t 2019/02:28:20:03:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.918417,-0.359184,-0.165822

which is R.A. +338.640 Decl. -9.545

missing R.A. +341.196 Decl. -7.931 (ibex-sun)

error is R.A. +2.556 Decl. +1.614

for a total 2.998 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 439 apogee:


ibex_rotate -o -u 0.946998,-0.290539,-0.137047 -w ibex-sun -t 2019/02:28:23:02:35

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.946998,-0.290539,-0.137047

which is R.A. +342.944 Decl. -7.877

missing R.A. +341.315 Decl. -7.889 (ibex-sun)

error is R.A. +1.629 Decl. +0.012

for a total 1.614 deg


ibex_rotate -o -u 0.946998,-0.290539,-0.137047 -w ibex-sun -t 2019-03-05T20:24:28.429Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.946998,-0.290539,-0.137047

which is R.A. +342.944 Decl. -7.877

missing R.A. +346.004 Decl. -5.984 (ibex-sun)

error is R.A. +3.060 Decl. +1.893

for a total 3.579 deg


No Lo O-mode.


There is no overlap with orbit 437 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken



On February 6, 2019 at 1:46 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #438.

Please respond to this thread with comments and approvals.

Approvals are required by COB on 9 Feb 2019.

 

Please note the following:

  1. Over Lap in commands from the previous ATS.

The second perigee pass for Orbit 437 transmitter on commands start prior to the execution of the Orbit# 438 Ascending BUS Commands. Then the transmitter off command executes between the Orbit# 438 Ascending BUS Commands and the Orbit 438 Ascending Payload Commands. This should not be an issue since the timed commands are sorted by time when they are uplinked to the spacecraft.

 

# Orbit # 437 SSR_Dump/Tracking Contact

  @ECT_SetRelay stx,on $TIME=2019/02:20:11:58:00

  @FMI_SetDownlink160K $TIME=2019/02:20:11:58:02

  @FMI_SetBilevelOutputControlReg STXMODE_Strobe,ON $TIME=2019/02:20:11:58:04

  @FMI_SetBilevelOutputControlReg COHERENT,ON $TIME=2019/02:20:11:58:06

 

# Orbit# 438 Ascending BUS Commands

  @FCT_SetScState science $TIME=2019/02:20:12:12:29

  @CEU_LO_SCIENCE_MODE NORMAL $TIME=2019/02:20:12:12:31

 

# Orbit # 437 SSR_Dump/Tracking Contact

          @ECT_SetRelay stx,off $TIME=2019/02:20:13:02:00

 

# Orbit# 438  Ascending Payload Commands 

  @CEU_MACRO_EXEC ASCENDING_PL1 $TIME=2019/02:20:14:19:21

 

  1. Orbit 438 Battery Balancing  

# 2019-03-01T06:41:01.615Z,Perigee,orbit:438   

  @ECT_SetLongEclipseFlag TRUE $TIME=2019/03:01:06:00:00

  @ECT_SetLongEclipseFlag FALSE $TIME=2019/03:01:07:30:00

 

  1. IBEX_2019_051_o0438a_v001_.ccvr

# Input files:         1

#   IBEX_2019_051_o0438a_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 2019/02/20 12:12:29 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2019/02/24 15:36:27 UTC

 

==============

OTHER MESSAGES

==============

NO MESSAGES.

 

 

 

Timothy E. Perry

Mission Operations

CRS, IBEX, OCO-2 & TESS

RAPTOR Test Team

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

 

 


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