ACE Weekly 03/09/2007 - 03/15/2007

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No attitude maneuvers were completed this week.  The next attitude maneuver
is scheduled for Friday, 03/16/2007.  Station-keeping maneuver #43 is
scheduled for Thursday, 03/29/2007.

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OCRs:

None

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Activities:

No impacts to operations due to the new Daylight Saving Time have been
found.  All operational workstations and PCs had been set to GMT in 2004.

RIONET
* Testing and configuration of String 3 continues.
* Additional firewall rules have been found that will need to be updated.
* String 2 conversion is targeted for April 18, 2007.

ROBOTT
* Testing of the recent patch (v1.0.3) is nearing completion.  This patch
will allow ROBOTT to work with the RIONet (CDSID#22954 and #23091).

Space Link Extension (SLE) - ACE SLE version 2.1 was delivered to the
Library on April 28, 2006.  Installation in the ACE MOC will not occur until
after the MOC is converted to the RIONET.

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Anomalies:

DOY 070  03/11/2007  S-ACE-0157  G07-0018  ROBOTT/C&C Froze
ROBOTT froze after procedure S_OPS_PLBK_COMPLETE completed (EOT-5minutes).
RTMON restart not performed since 5 minutes before End of Track.
CDSID#00021192
IMPACT:  This is a recurring issue that the ROBOTT developers are aware of.
Procedure G_ACEDOWN not performed.

DOY 074  03/15/2007  S-ACE-0158  G07-0019  DSS-66 Bad Ground Receipt Time
For DOY 073 and DOY 074, DSS-66 Ground Receipt Time (GRT) was incorrect, the
value jumped around by +/- 2 seconds.  DSN's CDR file was sorted by GRT, so
the data was out of order.  This prevented the ACE Science Center (ASC) from
correctly processing the data (i.e. vc2->vc4 conversion).  DOY 074 also had
the additional problem that the GRT day was wrong (17971 instead of 17970)
after switching to hi-rate.  DR's N104208 and N104209.
IMPACT:  ASC was unable to create Level 0 products for DOY 072 and 073.  VC2
data could be resorted by slice and virtual channel counter, but there is
difficulty in the fact that the virtual channel counter rolls over after 255
and that redumps of the same slice would have to be excluded from the
resort.  Since the data sent to the MOC was not reordered by GRT, the FOT
converted the TPOCC history files to the CDR format (96 bytes,block,2 byte
pad,block,2 byte pad,block,2 byte pad......).  The converted files were sent
to ASC and they were able to successfully process that data.

ACE's next DSS-66 pass is Saturday 03/17/2007 (DOY 076)