[Isocops] IBEX Goat Herder for 15 & 16 August 2022

[Perry, Timothy E [US] (SP)]

All,

     We completed the series of 3 USAK01 contacts for testing changes to improve our tracking data. During the USAK01 contact 15Aug22 @18:00 I set the spacecraft clock and the star tracker spin rate jumped to 30.2 rpm. This value stayed there for the duration of the pass. On the following USAK01 pass @20:30 we changed the Kalman filter input to ground command and set the values to zero and disabled the star tracker input. Using just the static Z rate the spin rate started to come down but it never settled out. On the final pass of the night USAK01 08/16/22 at 02:30 we enabled the star tracker spin rate and disabled the static z rate and the value stabilized at the 4.177 spin rate and residuals were low. We changed the Kalman filter input back to STA_PCT_VAL and the ACE looked nominal. We watched it for the duration of the pass and it stayed solid.



Tasks Accomplished:

SSR Dump -> Dump New

Set Spacecraft Clock

Reset FDC Totals

Reset 18 Day timer

CAR # 1258 Orbit 579 ATS uplink

   IBEX_2022_237_o0579a_v001 98 commands

CAR 1257 Redump Orbit 576 SSR Data – Dumped 17136 blocks of 26390 blocks

    Will dump the rest on the next orbit

Star tracker issue troubleshooting



Results from the Inertial Maneuver:
Q1 -0.48704600 ActNor.EstInrToBdy[0]
Q2 0.36519700 ActNor.EstInrToBdy[1]
Q3 0.79329000 ActNor.EstInrToBdy[2]
Q4 0.01037000 ActNor.EstInrToBdy[3]

GPS sec 1344617486 ActNor.EstTime
UTC time 08/15/2022 16:51:12 output

MPS Diff 0.800 deg

MPS Cmd Vector X -0.769676000
MPS Cmd Vector Y 0.589292000
MPS Cmd Vector Z 0.245629000

CSS Angle TLM 0.454134
CSS Sun-Pointing Angle 0.908268
  11 Aug 22 @02:00:00

CSS Angle TLM 0.775817
CSS Sun-Pointing Angle 1.551634
  15 Aug 22 @16:30:00

Pre-Burn
Thruster 1 3888 11 Aug 22 @02:00:00
Thruster 2 3792
Thruster 3 4416
Thruster 4 4512
Post-Burn
Thruster 1 4176 15 Aug 22 @16:30:00
Thruster 2 4080
Thruster 3 4720
Thruster 4 4816
Number of Pulses
Thruster 1 288
Thruster 2 288
Thruster 3 304
Thruster 4 304
Thruster Pairs
Thruster 1 & 2 576
Thruster 3 & 4 608



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