Philae Status

1
Philae Status
SWT

• Stephan Ulamec
• SWT, September 4-6, 2006, Helsinki

2
Overview

• Operations Activities
• Status of Lander (Subsystems and P/L)
• Planning

3
General Remarks

• Since the last LOWG (January 06) Philae was
  switched on during 3 operational blocks
• Passive Checkout PC2
  (07./08.03.06)
• Battery charging sequence
  (08./09.05.06)
• Passive Checkout PC3
  (28./29.08.06)
• Operations Activities all very successful
• Problems / Areas of concern (remaining)
• Increased secondary battery discharge
• Temperature gradients inside Lander higher than
  estimated
• DPU1 booting problem at low temperatures
• ADS pressure measurement indicates loss of gas

4
Philae In-flight Operations

• Results
• In general nominal behaviour of the Lander units,
  some features have to be
• monitored during the upcoming activities in
  2006/2007
• DPU1 cannot be switched ON at low
  temperaturesReset command or heating has to be
  applied if YEBox temp is below -26degC
• Secondary Battery self discharge higher than
  expectedRecharge performed in May and to be
  performed during PC4
• ADS pressure sensor indicates low tank
  pressureInvestigation ongoing (PC4)
• Lander overall temperature decreaseThe Lander
  temperature level decreased by about -5deg after
  the Earth Swing-by. For PC1 the temperature at
  Power ON of some unit electronics were already
  below -40degC, which was defined as the
  operational limit.

5
NCRs (I)

• ESS Event Strategy
• RMOC is flooded by high amount of created ESS
  events
• Status Separate ESS event packet store provided
  by RMOC, dump with priority of science data
• Temporary solution for Cruise Phase accepted at
  RMOC and LCC
• ESS PID106 packet generation processing
• Packets, stamped with PID106 by ESS (Bad
  telemetry) are discarded on-board the Orbiter.
• Status Under investigation at LCC
• Support by ESS SW provider (CAPTEC) is probably
  needed

6
NCRs (II)

• CDMS DPU-overswitch
• Increase RF link robustness by introducing
  TM-Backup Mode
• Status implemented in the upcoming CDMS SW
  Version
• PID106 packets may occur since ESS-CDMS protocol
  is not applied(Rx OFF) during data transfer -gt
  to be checked against Anomaly with PID106 packets
• CDMS-patch upload during PC4
• CDMS Mass Memory Handling
• Unpredictable dump behavior due to Mass Memory
  H/W problems. Solution by S/W means
• Status of development- Mass Memories can be
  used as RAM- Mass Memory behavior after power
  cycle still needs improvements
• -gt Impact on operation preparation for comet
  phase

7
NCRs (III)

• Unit - CDMS interface
• Missing, corrupted or duplicated data or science
  blocks
• Status- CDMS improvements in the upcoming CDMS
  SW Version
• ROMAP
• High voltage problem (SPM and Penning)
• Status stand-by
• Checkout during PC4 (HV levels 4 and 5)
• COSAC
• Oven did not heat as expected
• Status troubleshooting planned for Active
  Checkout 2006
• Test during PC4
• ADS
• Low tank pressure
• Status investigation ongoing with unit provider
• Checkout during PC4

8
Subsystems - Performance Overview

• Subsystem Performance Major Open Work for
  cruise for on-comet ops
• Electrical Support System ? no tbd
• CDMS ? no yes
• Power Subsystem ? no yes
• Thermal Control System ? no no
• Rx/Tx ? no no
• Active Descent System ? no yes
• Flywheel ? no no
• MSS and NEAs ? no yes
• Landing Gear ? no yes
• Anchor ? no no

9
Milestones during Cruise

• 2006 unit S/W-upload, battery maintenance/chargin
  g
• 2007 Lander Simulator phase 2 readiness (LSS,
  LEM)
• 2008/2009 Upgrade of data systems (LCC, H/W and
  S/W)
• 2011/13 Upload/update of SDL and on-comet
  operations
• 2012/13 Lander Team build-up and training

10
Activities for 2006/2007

• Payload Checkout 2 (passive) 07/08-03-2006
• Battery Charging 08/09-05-2006
• Payload Checkout 3 (passive) 28-08-2006
• Payload Checkout 4 (active) 28-11-2006
  (2x4days)
• Thermal Characterization 30-01-2007
• Mars Swingby 25-02-2007
• Payload Checkout 5 (passive) 18-05-2007 (5
  days)
• Payload Checkout 6 (active) 07-07-2007 (25
  days)
• Earth Swingby 2 13-11-2007

See SCrOP
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(No Transcript)
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Activities for 2007

• Mars Swing-by 11-02-2007 (28days)
• Mars closest approach 25-02-2007
• Payload Checkout 5 (passive) 18-05-2007 (5days)
• Start preparation (54 days) 05-03-2007
• Payload Checkout 6 (active) 17-09-2007 (14days)
• Start preparation (28 days) 26-03-2007
• Earth Swing-by 2 30-10-2007 (28days)
• Start preparation (125 days) 08-05-2007
• Payload Checkout 7 (passive) 04-01-2008 (5days)
• Start preparation (54 days) 22-10-2007
• Steins Flyby 22-08-2008 (28days)
• Start preparation (264 days) 20-08-2007

13
Activities 2006 / 2007
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Knowledge Management

• Knowledge will be kept by
• Keeping personalised experience
• Transferring know-how smoothly
• Maintaining the documentation
• Applying KM tools (Corolles, Hypertest)
• Performing tests and simulations (GRM, Software
  Simulator)
• Operating the FM regularly (2 3 times per year)