[Isocops] IBEX Spacecraft Clock Issue FRB Notes

Fri Aug 27 13:01:16 EDT 2021

I've done my usual IBEX-Hi processing and I found no issues -- if you hadn't told me the s/c clock had reset, I wouldn't have noticed.

The CEU clock is still plugging away on its own slightly drifty MET, and it's tagged all the payload packet times correctly.  I do check for invalid times and time jumps in the CEU clock in my processing.  It would be very unusual for the CEU to report a time circa 1970 inasmuch as its Epoch is GPS time and AFAIK it represents time as a uint32_t and so cannot report times prior to 1980.  1970 is Unix Epoch.  Anyhow, it doesn't look like the s/c clock told the CEU to reset its time.

I'll send out my usual status report later today.  I note star tracker lost tracking circa morning of Aug 20.

Paul Janzen.
________________________________
From: Isocops <isocops-bounces at lists.sr.unh.edu> on behalf of NIgel Angold <nangold at princeton.edu>
Sent: August 27, 2021 9:21 AM
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Cc: Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>; Ken Fairchild (kwfairchild at gmail.com) <kwfairchild at gmail.com>; Eric Christian <eric.r.christian at nasa.gov>; Bobbett, James E [US] (SP) <James.Bobbett at ngc.com>; ISOC at New Hampshire <isocops at lists.sr.unh.edu>; Leonard, Benjamin Y [US] (SP) <Benjamin.Leonard at ngc.com>; Ken Fairchild UNH (Ken.Fairchild at unh.edu) <Ken.Fairchild at unh.edu>; Fleming, Ed [US] (SP) <Ed.Fleming at ngc.com>; Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>; Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>; Ibex Mission Operations <ibexops at gmail.com>; Dave McComas <dmccomas at princeton.edu>; Cavallo, John A [US] (SP) <John.Cavallo at ngc.com>; Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>; Bret Hautamaki <bhautama at gmail.com>; IBEX FDG Group (ADS-IBEX at l3harris.com) <ADS-IBEX at l3harris.com>
Subject: [Isocops] IBEX Spacecraft Clock Issue FRB Notes

Attendees:
Reese Wynn, Carol Weaver, Tim Perry, Sheral Wesley, Eric Chubin, Nigel Angold, Harald Kucharek, Ryan Tyler, Jim Conway, Eric Christian, Ken Fairchild, Ben Leonard

SOC processing looks ok !!! Where does the time data come from? Ken will dig deeper into processing code - looks like there's a different time stamp around the time of the problem, but somehow the code copes with it.
Ryan: 1970 value looks like the ground doesn't know how to interpret the data it's receiving.
Tim: valid time stamps until August 24 at ~07:50 UTC.

There's no urgency to load the orbit 540 ATS: there are 2 more scheduled uplink opportunities before the commands onboard run out on 5 September.
The Master Reset Timer was reset last night.
We'll upload a test no-op time-tagged command.
We'll try to set the spacecraft clock.

Running order for activities during next contact

  *   Verify maneuver
  *   Send time-tagged no-op command?
  *   Monitor 2 commands executing onboard
     *   @FCT_SetScState science $TIME=2021/08:27:16:16:33
     *   @CEU_LO_SCIENCE_MODE NORMAL $TIME=2021/08:27:16:16:35
  *   Set the spacecraft clock

Party line will be up about 30 minutes before BOT. 888-330-1716 # 4895952

We'll use MAESTRO2.

Post-pass Zoom at 1:30 pm EDT. Details below.

Future planning - TBD

  *   Do we need additional contacts (next scheduled is the apogee contact on September 1 at 03:00 UTC i.e. early Wednesday morning)
  *   Any diagnostic activities identified
  *   Possible next steps?

--------

Nigel Angold is inviting you to a scheduled Zoom meeting.

Topic: IBEX Spacecraft Clock Post-Contact Tag-up
Time: Aug 27, 2021 01:30 PM Eastern Time (US and Canada)

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