DAWN-FC
DAWN - Framing Camera
DC014 Report
DA-FC-MPAE-RP-287
Issue: 1
Revision: a
01/02/2010
Prepared by:
Thorsten Maue
Pablo Gutierrez
Approval Sheet
prepared by: Thorsten Maue (signature/date)
approved by: Pablo Gutiérrez-Marqués (signature/date)
Document Change Record
Iss./Rev. Date Pages affected Description
1 01/02/2010 all first release
Distribution Record
Holder Issue/Revision
D 1 2
Configuration File (Doc)
MPS
KMA AYE
IB Büttner
JB Bukatz
UC Christensen
RE Enge
WG Goetz
PGM Gutierrez-Marques
HH Hartwig
HUK Keller
WK Kühne
AN Nathues
HP Perplies
MR Richards
RS Schäfer
KS Schneider
ISE Sebastian
HIS Sierks
MS Sperling
ISZ Szemerey
DLR Carsenty
DLR Jaumann
DLR Mottola
IDA Fiethe
IDA Michalik
IDA Bubenhagen
JPL Miller
JPL Pavri
OSC Violet
Legend:
A - Approval
C - Copy
U - Updated Pages
Table of contents
1. General aspects ...................................................... 1
1.1 Scope ........................................................... 1
1.2 Introduction .................................................... 1
1.3 Applicable Documents ............................................ 1
1.4 Reference Documents ............................................. 1
2. Results .............................................................. 2
2.1 General ......................................................... 2
2.2 FC1 performance ................................................. 2
2.2.1 Extra charge ............................................. 2
2.3 FC2 performance ................................................. 3
2.3.1 Extra charge ............................................. 3
2.4 Streaks ......................................................... 4
3. Operational log ...................................................... 7
3.1 2008-093 (2008-04-01) ........................................... 7
3.2 2008-094 (2008-04-02) ........................................... 10
3.3 2008-095 (2008-04-03) ........................................... 15
List of Figures
Figure 1: Accumulated histogram of pixels showing extra charge on FC1 .........3
Figure 2: Accumulated histogramof pixels does not show any extracharge on FC2..3
Figure 3: Three streaks on FC2_2008-04-03T02.39.12.707Z_ID10_0000000882_F1 ....4
Figure 4: Three streaks on FC2_2008-04-03T02.39.27.845Z_ID10_0000000883_F1 ....5
Figure 5: Two streaks on FC2_2008-04-03T02.39.38.025Z_ID10_0000000884_F1 ......5
Figure 6: Two streaks on FC2_2008-04-03T02.40.17.810Z_ID10_0000000885_F1 ......6
Figure 7: One streak on FC2_2008-04-03T02.49.17.694Z_ID10_0000000897_F7 .......6
List of Tables
Table 1: Relation of the streaks found in the DC014 images .............4
1 General aspects
1.1 Scope
This document reports the results of the operation of the Dawn Framing Cameras in the frame of DC014.
1.2 Introduction
The Framing Camera test slot within DC014 was intended to replace the onboard software for both cameras and perform a minimal functional checkout afterwards.
To this end, both cameras were operated one at a time, first replacing the software and then performing the set of operations known as “CCD mini cal”. This set includes some image acquisitions aimed at the detection and evaluation of extra charge.
Operationally, the test was a success: the software of both cameras was replaced and all 72 images were retrieved from each of the cameras. There was a minor hiccup when the camera was commanded to get ready for power down while the mechanisms were off, but the problem was later solved and the lesson learnt for further occasions.
About the content of the images, it is remarkable that several streaks were found, even more than one in some images. A detailed account is reported on section 2.4.
Section 3 includes the operational log from the FC team.
1.3 Applicable Documents
no. document name document number, Iss./Rev.
AD1
1.4 Reference Documents
no. document name document number, Iss./Rev.
2 Results
2.1 General
The main result obtained from the DC014 operation slot was the update of the flight software of both FC1 and FC2 to version 3.03.02. As a side bar, the operations served as additional monitoring point of the condition of the cameras by the execution of the CCD mini cal, reporting below. A general remark is that all images were received successfully on ground for both instruments. Additional, it is worth mentioning that in this un-targeted activity the solar elongation was close to the exclusion zone, causing a visible amount of out-of-field stray light in most of the images.
Also during the operation slot, several streaks were found and reported hereafter.
Finally, an operation error was found in the FC sequences. The nominal power-down sequence, which includes FCPrepPowerDown shall not be used immediately after flight software update. The usual procedure of changing the LLSW and the UDP library together results in the UDP library not booting spontaneously after upload. This results in the MCU not being powered on during the whole on-phase of the UDP library upload (the UDP library switches on the MCU during the boot). As a consequence, if FCPrepPowerDown is sent, the UDP library will find a non-responsive MCU and will flag the mechanisms as failed, preventing their operation until maintenance is conducted for clearing the flag. This operational work around shall always be regarded when replacing the flight software of the cameras.
2.2 FC1 performance
2.2.1 Extra charge
As already detected earlier the extra charge on FC1 could be verified to be still present and not having changed significantly.
The extra charge measurements during DC014 where done with different pre illumination times, allowing the extra charge to accumulate prior to the exposure. Figure 1 shows the accumulated frequency of DNs all the 1024x1024 pixels. The six different graphs show the level of extra charge for six different illumination times (from bottom to top: 1.3 s, 2.3 s, 3.3 s, 4.3 s, 6.3 s, 11.3 s). The most effected pixels show extra charge of up to 200 DNs.
Figure 1: Accumulated histogram of pixels showing extra charge on FC1
2.3 FC2 performance
2.3.1 Extra charge
No traces of extra charge could be found on FC2 during DC014. Figure 2 shows only the up to 5 DNs noise consisting of readout noise and photon noise.
Figure 2: Accumulated histogram of pixels does not show any extra charge on FC2
2.4 Streaks
Several streaks were identified in the images taken during this operational slot. The following table identifies the images where one or more were found.
Table 1: Relation of the streaks found in the DC014 images
Image Streak location
FC2_2008-
0403T02.39.12.707Z_ID10_0000000882_F1 One in the upper center
One at the bottom left
One at the bottom right
FC2_2008-
0403T02.39.27.845Z_ID10_0000000883_F1 One in the upper center
One at the bottom left
One at the bottom right
FC2_2008-
0403T02.39.38.025Z_ID10_0000000884_F1 One in the upper center
One at the bottom right
FC2_2008-
0403T02.40.17.810Z_ID10_0000000885_F1 One in the upper left
One at the bottom center
FC2_2008-
0403T02.49.17.694Z_ID10_0000000897_F7 One long streak in the upper center and right
Figure 3: Three streaks on FC2_2008-04-03T02.39.12.707Z_ID10_0000000882_FI
Figure 5: Two streaks on FC2_2008-04-03T02.39.38.025Z_ID10_0000000884_F1
Figure 6: Two streaks on FC2_2008-04-03T02.40.17.810Z_ID10_0000000885_F1
Figure 7: One streak on FC2_2008-04-03T02.49.17.694Z_ID10_0000000897_F7
3 Operational log
3.1 2008-093 (2008-04-01)
2008-093T00:00:30Z EGSEs at MPS and DSC up and running. Telemetry if flowing from the s/c.
On the phone Carol pointed out that technically it would be possible to run the whole FC2 activity in today's pass, but we have to be very careful to avoid colisions with absolutely timed activities that are scheduled to start close to the end. Pending a more careful revision of the time available, the decision has been to start with the SW update and reconsider the options once it is clear.
00:11:28Z Radiation of dz109a to switch of FC2 CCD heaters
001506Z Radiation completed of di3280
002022Z Radiation started of di3281 002400Z Radiation completed
002548Z Radiation started of di3282 002952Z Radiation completed
003000Z The CCD heaters are off and the temperature is sinking
003124Z Radiation started of di3283 003520Z Radiation completed
Flight reports that the T/C speed today is 2kbps, so the transimission time is approximately 3 min 20 s per file.
It has been agreed that, for safety reasons, the UDP library upload will not start until confirmation is recieved that the LLSW completed successfully and FC2 is off.
- 003624Z Radiation started of di3284
- FC2 CCD Temp -20.0
- 004032Z Radiation completed
- FC2 CCD Temp -28.6
- 004145Z Radiation started of di3285
- Flight confirms that two files are loaded on buffers 4 and 5
- 004834Z Radiation completed
- FC2 CCD Temp -38.2
- 004935Z Radiation started of di3286
- 005245Z Confirmation of 4 files on buffers
- 005412Z Radiation completed
- 005623Z Radiation started of di3287
- FC2 CCD Temp -44.3
Flight reports that mission has decided to stay with FC2 SW upload today and leave FC2CCD minical for tomorrow.
At this time the commanding will wait for confirmation that all 8 files are in their corresponding buffers.
Confirmation of 5 files in the buffers.
- 010325Z Confirmation of 6 files in the buffers.
- 010903Z Telemetry problem with GSEOS. Session restarted
- 011412Z Confirmation of 8 files in the buffers.
- 011531Z Radiation started of di3279
- 012002Z Radiation completed
- 013300Z FC2 CCD Temp -57.9
- 013700Z FC2 is up and the LLSW is being uploaded
- 014211Z Starting the third sequence
- 014439Z Starting the fourth sequence
- 014716Z Starting the fifth sequence
- 015501Z Starting the last sequence
- 015744Z Camera is on and reports the right LLSW version
- 020708Z Camera is off and ready for the UDP library upload
- Starting transmission of di3245
- Expected power up at 022330Z ERT
- 022519Z Camera is on again and reports 3.03 LLSW
- ResetUDPManager executed successfully
- 022716Z Radiation started of di3246
- 023132Z Radiation completed
- Expected feedback at 024800Z ERT
- 023328Z Radiation started of di3247
- 023630Z Radiation completed
- Expected feedback at 025300Z ERT
- 024159Z Radiation started of di3248
- 024450Z Radiation completed
- Expected feedback at 030100Z ERT
- 025022Z Radiation started of di3249
- 025338Z Part 1b is executing
- 025455Z Radiation completed
- Expected feedback at 031100Z ERT
- 025536Z Part1b is done and camera reports 221 UDPs loaded
- 025828Z Radiation started of di3250
- 030204Z Part 2a is executing
- 030214Z Radiation completed
- Expected feedback at 031916Z ERT
- 030420Z Part2a is done and camera reports 82 UDPs loaded
- 030617Z Radiation started of di3251
- 031029Z Radiation complete
- Expected feedback at 032720Z ERT
- 031229Z Part 3a is executing
- 032146Z Part 3b is done and camera reports 135 UDPs loaded
- 032726Z Part 4 is executing
- 032902Z Part 4 is done and camera reports 48 UDPs loaded
- 033026Z Part 5 is done and camera reports 34 UDPs loaded
- 033143Z Part 6 is done and camera reports 10 UDPs loaded
- All parts have been uploaded successfully, FC2 is ready
- 033312Z Starting radiation of di3252
- Expected feedback at 035022Z ERT
044856Z The LLSW and UDP library upload went nominal, but the execution of FCPrepPowerDown with MCU off has probably resulted in flagging both mechanisms as failed. After discussion with the mission it has been agreed to power up FC2 for 5 minutes to get a confirmation that this is the case and prepare contingency products for both FC1 and FC2 to solve the situation.
051115Z FC2 is powered and shows the failed mechansim on. Powering down with nominal sequence. ERT 052752Z
053900Z FC2 is powered off. The anomaly description has been sent to Flight manager together with the contingency products to tackle it.
3.2 2008-094 (2008-04-02)
2008093T201000Z Connection established from FSTB3 to DSC for verification of the contingency products for clearing the Mechanism Failure flags.
201700Z Power up and boot ok, patch ok, FCPrepPowerDown behaved nominal, Power down ok.
201845Z Second power up ok, shows the failure flags cleared through the power cycle.
202530Z FC2 is off. Reconfiguring camera and EGSE for FC1 run of the contingency products. As the flags have been corrected already, the sequence for FC1 will be powerup, contingency file and power down. This will confirm that the commands areunderstood by the camera and the correctness of the parameters can be verified by inspection.
203000Z FC1 is on. Booting completed nominal.
203300Z FC1 has received and executed both commands on the contingency product. Proceeding to power down.
203510Z FC1 is off.
2008094T000000Z The Command Approval Meeting has been completed with agreement that 5 files will be sent to FC2 for fixing the Mechanism Failure Flags:
- -power on
- -flag change
- -power off
- -power on
- -power off
The sequences will be 5 min apart except the last, that would require TWLT to confirm that the patch has worked.
- 001300Z Telemetry is flowing from the spacecraft.
- FC2 CCD Temp -63.7
- 002400Z FC1 CCD heaters switched off
- 002700Z FC1 CCD Temp -12.9
- 003000Z FC1 CCD Temp -21.7
- 003300Z FC1 CCD Temp -28.0
- 003347Z Starting transmission of dz167a
- ERT 005102Z
- 003600Z FC1 CCD Temp -32.6
- 003853Z Transmission of di3328
- ERT 005610Z
- 003900Z FC1 CCD Temp -36.0
- 004200Z FC1 CCD Temp -39.4
- 004401Z Transmission of dz159a
- ERT 010117Z
- 004500Z FC1 CCD Temp -41.6
- 004800Z FC1 CCD Temp -43.8
- 004908Z Transmission of 167a
- ERT 010624Z
- 005100Z FC1 CCD Temp -46.0
- FC2 is on and shows the mechanism flags on. They will be reset by subsequent commands
- 005400Z FC1 CCD Temp -47.6
- 005418Z Transmission of dz159a
- ERT 011134Z
- 005618Z Mechanism Failure Flags patched
- 005700Z FC1 CCD Temp -48.7
- 010000Z FC1 CCD Temp -50.4
- 010300Z FC1 CCD Temp -51.4
- FC2 is off
- 010600Z FC1 CCD Temp -52.5
- FC2 is back on. Flags are off.
- 010900Z FC1 CCD Temp -53.6
- 011142Z Powering down FC2
- 011200Z FC1 CCD Temp -54.1
- 011252Z FC2 is off
- 011500Z FC1 CCD Temp -55.2
- 011800Z FC1 CCD Temp -55.8
- 011949Z Transmission of dz296b
- ERT 013740Z
- 012100Z FC1 CCD Temp -56.3
- 012400Z FC1 CCD Temp -56.8
- 012700Z FC1 CCD Temp -57.4
- 013900Z FC2 is on again
- 014458Z FEE is on
- 014948Z CCD Minical is started
- 022528Z 19 basics acquired. 24 commands, 23 images. Starting Extra charge block
023636Z Flight confirms that the FC1 LLSW files can be uploaded at this point, posing less of a load to the s/c than during playback. ACE will enqueue the files 1 through 8 and confirm only after completion. If any file were missing at the time FC1 operationsshould start, it would be resent and confirmed prior to the beginning of FC1 operations.
023832Z Extra charge block completed with 28 commands and 51 images. Starting pre-imaging darks
024359Z Pre-imaging darks completed with 31 commands and 54 images. Opening door. Door is open nominally. 32 commands and 54 images
- 024656Z Starting image acquisitions
- 025911Z Starfield observation completed with 58 commands and 72 images. Closing door
- 030023Z Door closed with 59 commands and 72 images.
- 030449Z Fee is off, 60 commands and 72 images.
- 031608Z 6 images recieved OK
- 033348Z Systems reports that files 1 through 8 are in their corresponding buffers.
- All images have been transmitted to VR 8
- 034155Z All serials down
- 035300Z All images down except the final packet of the last image
- 044109Z Back to real-time. Starting power down.
- 044200Z Camera is off. CCD Heaters are back on.
- FC CCD Minical sequence completed with 61 commands, 72 images, 5463 HK packets and 6319 events generated.
- 044652Z Playback completed, all images received. That completes FC2 activities for DC014.
- 045039Z Starting transmission of di3270
- ERT 051146Z
- 051203Z FC1 is on. After 1 min it is still on the consumption of LLSW update
- 053328Z FC1 LLSW update is completed and the camara has booted into 3.03.
In prevision of a station hand-over comming up between 0555 and 0615, all commanding will be suspended from 0550 until re-acquisition of commanding capability. Systems is verifying that the transmitter of the next station is in green.
- 053834Z FC1 is off. Proceeding with UDP library upload
- 054105Z Starting transmission of di3261
- ERT 055824Z
- 060054Z FC1 is on again and the prologue has executed nominally.
- 061131Z Starting transmission of di3262
- ERT 063239Z
- 061836Z Starting transmission of di3263
- ERT 063849Z
- 062539Z Starting transmission of di3264
- ERT 064541Z
- 063608Z di3262 (part 1a) executed successfully
- 063308Z Starting transmission of di3265
- ERT 065416Z
- 064155Z di3263 (part 1b) executed successfully
- 064155Z Starting transmission of di3266
- ERT 070244Z
- 064807Z di3264 (part 2a) executed successfully
- 064858Z Starting transmission of di3267
- ERT 071003Z
- 065727Z di3265 (part 3a) executed successfully
- 070550Z di3266 (part 3b) executed successfully
- 071132Z part 4 executed successfully
- 071342Z part 5 executed successfully
- 071431Z part 6 executed successfully
- 071611Z Transmission of di3268
- ERT 073332Z
- 073415Z Executing epilogue
- 074247Z Epilogue completed with the known result
- 074744Z FC1 is off
- 075308Z Transmission of dz141a
- 075811Z Transmission of di3326
- 080318Z Transmission of dz133a
- 081130Z Transmission of dz141a
- FC1 is booting
- 081329Z Transmission of dz133a
- 082045Z FC1 is off after patching
- 082633Z FC1 is booting for verification
- 083100Z FC1 is powered down and ready for CCD minical
- 2008094T201000Z Connection established from S/C Master OPS to DSC and Lindau
- 172508Z Transmission of dz286f
- ERT 174232Z
- 174416Z FC1 is on
- 175025Z FEE is on
- 175515Z DLR Extra charge block started
- 180138Z DLR Block finished with 5 commands and 4 images
- 181015Z Starting basic 19 183215Z Darks block finished with 24 commands and 23 images.
- Starting extra charge images
- 184339Z Extra charge block finished with 28 commands and 51 images.
- Starting pre-imaging darks
- 184715Z Pre-imaging darks completed.
- Opening door
- 184752Z Door opened successfully. 32 commands and 54 images.
- 190515Z Star field observation completed with 58 commands and 72 images.
- Closing door
- 190553Z Door closed successfully with 59 commands and 72 images.
- 191018Z FEE is off
- 191606Z S/C is in playback mode
- 191640Z Playback has started
- 200440Z Playback has completed, waiting for the last packet of the last images.
- 71 images received successfully.
- 204210Z Back in real-time mode
- 204618Z Initiating power down sequence
- 204730Z FC1 is off
- 205223Z The last image is down