Status update of ASM on Swarm Charlie Swarm 4th DATA QUALITY
WORKSHOP 2 December 2014 GFZ Potsdam Jean-Michel Lger Slide 2
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QUALITY WORKSHOP 2-5 December 2014 GFZ Potsdam Presentation outline
Overview of ASM-A & ASM-B operations on Swarm Charlie Anomaly
on 05/11/2014 Summary of investigations carried out up to now
Investigation commission by ESA/CNES/Leti Slide 3 Cliquez pour
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2-5 December 2014 GFZ Potsdam Historique et projets en cou2 2Trs
FM3A Switch-on after launch (noise issue) The vector mode is
achieved BUT the ASM noise level indicator is degraded when
compared to scalar and burst mode (x4-5) UNEXPLAINED, but not
considered as critical (still well below the mission specifications
for the scalar measurements resolution) scalar burst vector scalar
vector Vector with modulations OFF OK NOK Slide 4 Cliquez pour
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2-5 December 2014 GFZ Potsdam Historique et projets en cou2 2Trs
Switch-on after launch (FM3B KO) FM3B switched on to take advantage
of the vector mode nominal performances failure to detect the
magnetic resonance, even in the backup mode without motor All
diagnostic modes except magRes OK RF sub-system at the origin of
the problem Slide 5 Cliquez pour modifier le style du titre | 5| 5
Swarm 4th DATA QUALITY WORKSHOP 2-5 December 2014 GFZ Potsdam
Historique et projets en cou2 2Trs Events on ASM-C since launch
SWARM Charlie - ASM FM3A configuration ASM DPU identification DPU 9
ASM sensor S9 ASM flight software LV7.7 ASM parameters table
SW-CEA-MAG-TECHR-036 v1.4 (Break mode duration = 0 and Default mode
= Vector) In-flight updates May 2014: Modifications in RAM of the
following items have been (re)performed in RAM: re-definition of
the HK-Observables packet generation rate to 1 Hz (15/05/2014)
Level 0 FDIR action of EventID 2 disabled June to October 2014:
None ASM modelEvent / Anomaly FM3A SWARM Charlie VFM/ASM residuals
characterization Yaw slews maneuvers performed from 12 to
14/05/2014 The anomaly TCs no longer processed, which first
occurred on ASM FM3A on 28/12/2013 has led to an ASM flight
software update from LV 5.5 to LV 7.7 on 24/04/2014 Slide 6 Cliquez
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WORKSHOP 2-5 December 2014 GFZ Potsdam Historique et projets en
cou2 2Trs Anomaly on 2014/11/05 All signals are nominal prior to
the failure, no evolution of any HK has occurred Slide 7 Cliquez
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WORKSHOP 2-5 December 2014 GFZ Potsdam Recovery actions Several
starting procedures launched at nominal, lower (0C) and higher (30
C) temperatures, all unsuccessful Same behaviour, but power
consumption slightly dependent on temperature (increasing with
temperature) but always below expectations (about 10 to 15 mA)
SWARM Charlie FM3A Date Courant LCL PHT00032 (A) BOOT P1 BOOT P2
Tension PCDU PHT00062 (V) Puissance (W) BOOT P1 BOOT P2 Temp DPU
TST50080 (C) 26/11/2013-09:39 0.126-0.129 0.185-0.195 32.7-33.7
4.2-4.32 6.14-6.36 [9-12] 04/12/2013-14:11 0.125-0.130 0.185-0.195
33.2-33.6 4.18-4.34 6.27-6.52 [10-14] 03/01/2014-11:29 0.122-0.129
0.188-0.194 33.6-33 4.09-4.3 6.21-6.46 [9-12] 24/04/2014-07:51
(passage en BOOT, MAJ LV7.7) 0.121-0.128 0.184-0.196 33.6-33
3.99-4.24 6.06-6.55 [9-12]
05/11/2014-09:050.108-0.11132,23.47-3.58[9-12]
07/11/2014-09:050.105-0.10932,23.39-3.52[10-12]
11/11/2014-08:320.106-0.10932,23.41-3.52[0.2-0.4]
12/11/2014-07:570.109-0.11432,23.50-3.67[28-30] Slide 8 Cliquez
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WORKSHOP 2-5 December 2014 GFZ Potsdam Historique et projets en
cou2 2Trs Investigation means In-flight, only the primary power
consumption profile is available since no communication has been
received from the instrument since the 05/11/14 event On ground, 2
EMs (not fully representative), 1 EQM and 1 PFM are available for
investigation. Restriction: no hardware modification on the PFM
Tests have been conducted on the EQM, without forcing hardware
defaults -except for 29 + MHZ oscillator-, to check the various
assumptions on the potential origin of the problem Slide 9 Cliquez
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WORKSHOP 2-5 December 2014 GFZ Potsdam Historique et projets en
cou2 2Trs Ground tests on EQM 1/2 Power consumption profile
observed on the EQM during the boot mode Slide 10 Cliquez pour
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December 2014 GFZ Potsdam Historique et projets en cou2 2Trs Ground
tests on EQM 2/2 The oscillator failure hypothesis is not
consistent with the observed power profiles The nominal power
consumption in boot mode should be higher than what has been
measured on the FM3A after the anomaly: either parts of the digital
core are not functional or it is not properly powered No estimation
of the consumption thanks to simulation in failure modes available
A test sequence including the generation of hardware defaults is
difficult both to define (induced stress assessment has to be
evaluated prior to any operation in order to prevent failure
propagation effects) and to carry out (ERC32/RAM/ASIC are highly
integrated) Slide 11 Cliquez pour modifier le style du titre | 11
Swarm 4th DATA QUALITY WORKSHOP 2-5 December 2014 GFZ Potsdam
Historique et projets en cou2 2Trs Potential failure localization
Given the observed power consumption profile, the +3.3 V power line
or the digital core are the most likely candidates Slide 12 Cliquez
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WORKSHOP 2-5 December 2014 GFZ Potsdam Current status Several
teleconferences have been organized involving ESA, CNES, Astrium
and Leti to propose and carry out recovery actions, with no
positive outcome so far As a consequence, no ASM data available for
Swarm Charlie since the 05/11 An investigation team of specialists
from CNES, ESA and Leti has been set up, and should meet in the
coming days in Toulouse (confidentiality issues solved) It will be
in charge of the coordination of all further analyses to identify
the anomaly origin and potential mitigation actions
