CIVA Status Venezia, Palazzo Cavalli Franchetti March 31, 2009 Philae Science Team Meeting.
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Transcript of CIVA Status Venezia, Palazzo Cavalli Franchetti March 31, 2009 Philae Science Team Meeting.
CIVA Status
Venezia, Palazzo Cavalli Franchetti
March 31, 2009
Philae Science Team Meeting
2 LOWG#11, CNES Toulouse 29-31th of October 2007
Civa overall status
Overall good health For what could be tested (all but the IR detectors), all systems
work nominally: the 7 CIVA-P cameras, CIVA-M/V in three colours, CIVA-M/I Infrared spectral-imager.
3 LOWG#11, CNES Toulouse 29-31th of October 2007
CIVA-P CAM 1 01:53:21 LOBT
4 LOWG#11, CNES Toulouse 29-31th of October 2007
Cratères
with a pretty good image quality: resolution, focus
5 LOWG#11, CNES Toulouse 29-31th of October 2007
calibration oven
6 LOWG#11, CNES Toulouse 29-31th of October 2007
empty oven (# 7)
7 LOWG#11, CNES Toulouse 29-31th of October 2007
empty oven (# 7)
10 µm spot
empty oven (# 7)
8 LOWG#11, CNES Toulouse 29-31th of October 2007
Civa status
Overall good health For what could be tested (all but the IR detectors), all systems
work nominally: the 7 CIVA-P cameras, CIVA-M/V in three colors. Demonstrated by MSB CIVA-P images and by imaging ovens ESB1 + MSB provided an accurate photometric calibration SONC processing of data is perfect
But 2 concerns remained before PC8 Data transfer quality and rate from and to CDMS (before CDMS SW
upload)
Need to have access to lower integration times for CIVA/P in case of bright areas on the comet (and for ESB3) to avoid saturation.
9 LOWG#11, CNES Toulouse 29-31th of October 2007
CIVA-P CAM 1 01:53:21 LOBT
10 LOWG#12, DLR Cologne 18-20th of November 2008
CIVA Status: PC8 results
Extensive verification of the data transmission integrity between CIVA and CDMS in both ways, after upload of a new CDMS software. Quality of the link has been greatly improved after
the CDMS upload.Tested with CIVA but valid for the whole payload.
Measurements of the data transmission speed is mainly unchanged with respect to previous version (up to 11 kbits/sec in direct, and 8 kbits/sec to EEPROM)
11 LOWG#12, DLR Cologne 18-20th of November 2008
CIVA Status: PC8 results New CIVA Software 7.8 gives access to integration times down to 4 msec. After that upload, the instrument generated repeatedly simulated images
instead of real images (both with panoramic cameras and with M/V microscope). Simulated images are generated autonomously by the CIVA DPU
instead of real images incase of detection of a transmission anomaly from the camera (interrupt counter)
The transition from nominal to degraded behavior seems related to the time of the upload.
Behavior never experienced on any ground reference model (IAS or DLR).
Need for a contingency activity slot
Request of specific activities for the PC8 contingency slot
12 LOWG#12, DLR Cologne 18-20th of November 2008
CIVA Status: PC8 contingency activities
First activity was to repeat the PC8 panorama image acquisition : All images were nominal !!! the problem experienced during PC8 seems not directly related to
software upgrade, but to change in the instrument environment. Another repeat of CIVA/P and CIVA/MV acquisitions was performed,
again with all data fully nominal. The downgrade back to previous Software version has been canceled Request of detailed analysis of the configuration of the system:
Philae configuration (use of redundant systems ?), Temperatures, Power supply voltage and currents, Other ongoing activities in Philae (instruments and systems) and
Rosetta Orbiter No concluding evidences have been found yet.
CIVA : Plan / rationale for PC10
Plan / rationale for PC10 Standard instrument check-out. Upload of a more robust Software in order to avoid generation of
simulated images in case of partial failure of data transmission between the CIVA camera and DPU.Software still under development and test at IAS.
Participation in integrated test sequences representative of the Comet phase:SD2/COSAC/CIVA-M combined operationsCIVA-P participation in ROLIS SDL test with data transfer in
CDMS Mass MemoryCIVA-P participation in CONSERT Interference test
13 LOWG#12, DLR Cologne 18-20th of November 2008
CIVA : other future activities
Plan / rationale for PC 12 Health check & Participation in integrated test sequences
representative of the Comet phase, including CDMS and Lander system status.
Plan / rationale for ESB3 & Lutetia No participation foreseen if Philae workload too heavy.
Plan / rationale for SDL Imaging of the Lander soon after release (distance of less
than 100 m) with later transfer of the data during descent if possible.
First priority remains panoramic imaging just after Landing, and quick transfer of those data to Earth (landing validation and characterization.
14 LOWG#12, DLR Cologne 18-20th of November 2008