UVIS TEAM MEETING
OPERATIONS UPDATE
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
1
Instrument Status
• On/Off Cycle: 28.
– +1 since last meeting.
– S/C safing on 11/1/2010 in S64
• Hours On: ~90,500 hours.
– Longest continuous operations: 9/11/2007 – 11/1/2010.
• HDAC Filament Modulation:
–
–
–
–
–
Filament 1: 122.28 hours (H cell), 100.28 (D cell).
Filament 2: 12.22 hours.
Last: In S63 during T72 (H cell only).
Lost: In S64 during T73 (did not execute).
Next: In S67 during T75 (H cell and D cell).
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
2
Significant Data Issues
S61
None
S62
UVIS_136SW_IPHSURVEY004
UVIS_137OT_OUTERSAT003
Data loss: Station problem
Data loss
S63
UVIS_138TI_LMBINT001_CIRS
UVIS_138SW_IPHSURVEY016
Wrong target: target was Saturn
Total Loss
S64
UVIS_139IC_ALPVIR001
UVIS_139SW_IPHSURVEY006
UVIS_139SA_AURSLEW001
All data from 306-21 to 328-10*
Data loss: Rain
Data loss: Station problem
Data Loss: Lighting strike
Total loss: S/C safing
S65
UVIS_141SW_IPHSURVEY013
UVIS_141SW_IPHSURVEY010
UVIS_141SW_IPHSURVEY011
UVIS_142SW_IPHSURVEY002
UVIS_142SA_MOS142APO002
Data loss: Rain
Total loss: Station problem
Total loss: Station problem
Data loss: Rain
Data loss: Rain & station pb
* Includes: UVIS_140SA_MOS140APO001 & 002, UVIS_141IC_ALPVIR001
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
3
First Time Events
• New SSR allocation for IEB (starting S65).
• Use of “cyclic” to send commands to UVIS
during system scan:
– Starting S65 (should have been S64 but…).
– Save command memory space on-board the S/C:
• UVIS_142SA_MOS142APO001_PRIME with cyclic: 5
commands.
• UVIS_142SA_MOS142APO001_PRIME without
cyclic:545 commands.
• UVIS_142SA_MOS142APO001: timing looks Ok.
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
4
Note on System Scan
• Need to increase the SSR allocation by 0.6%
from what is given by the spreadsheet:
– The spreadsheet assumes un-interrupted data
acquisition.
– In the system scan there is one integration per
mosaic stop… The last packet of each
integration is not fully filled… The spreadsheet
does not take that into account.
– In UVIS_142SA_MOS142APO001 expected 545
integrations. Got 542+.
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
5
Note on System Scan
Un-interrupted data acquisition
Packet 1
Packet 2
Packet n
Integration 1
Packet n+1
Packet n+2
Integration 2
Interrupted data acquisition
Packet 1
Packet 2
Integration 1
01/04/11
Packet n
Packet n+1
Unused
UVIS TEAM MEETING OPERATIONS UPDATE
Packet n+2
Integration 2
6
Rbot: Workload Impact
• The impact of Rbot on the ops team
workload is highly variable:
– S64: 1 out of 6 designs
– S65: 3 out of 10 designs
– S66: 1 out of 10 designs
– S67: 0 out of 15 designs
– S68: Don’t know yet.
• The up-front job done by SP and the
lowering of the keep-out values (to +/300 rpm starting S67) help a lot.
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
7
Major Local Issues
• Uplink side: None
• Downlink side:
– Beginning of S65: problem ingesting data with
the correct CIMS labels due to a clock kernel
switch in FSIV.
• Consequence of the S64 safing
– In S65: problem processing large files
generated by long (32 hours) system scans.
• We have a workaround
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
8
XM Data Utilization Summary
S42 – S61
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
9
XM Data Utilization Summary
S62
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
10
XM Data Utilization
Summary
S63
01/04/11
UVIS TEAM MEETING OPERATIONS UPDATE
11
Notes and Reminders
• Use UVIS_SOLAR_OFF to Sun in CIMS for all solar
occultation instead of ISS_NAC to Sun (-20.0, 0.0, -0.11
deg) offset.
• HDAC modulation is a non-standard power mode.
• Before requesting sponge bits let us know what you want as
we may have a good understanding of instrument SSR
loading.
• The list of ring occultations that contain an atmospheric
occultation is on the team web site at
http://lasp.colorado.edu/cassini/team-site/archive/docs/pdf/Atmospheric_Occ.pdf
• The list of all the tour calibrations is on the team web site at
http://lasp.colorado.edu/cassini/team-site/archive/docs/pdf/UVIS_Tour_Calibration.pdf
• The UVIS PEFs are on the team web site at
http://lasp.colorado.edu/cassini/team-site/operations_planning/planning_info/
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UVIS TEAM MEETING OPERATIONS UPDATE
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