CIVA Status

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.


CIVA-P CAM 1 01:53:21 LOBT


Cratères

with a pretty good image quality: resolution, focus


calibration oven


empty oven (# 7)


empty oven (# 7)

10 µm spot

empty oven (# 7)


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.


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)


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


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


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.


Documents

CIVA Status