Transcript SMOS L1 Processor Prototype V 1.6.1 Status

SMOS SODAP
Status
Michele Zundo
ESA/ESTEC
EOP-PEP
SMOS KP 0
09-Dec-2008
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Presentation Summary
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SODAP Scope
SODAP Tasks
SODAP Team
SODAP Timeline
SODAP Procedures
SODAP Execution:
– SODAP Week 0
– SODAP Week 1, 2
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SODAP Outcome
SODAP Observation
Conclusion and Recommendations
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SODAP Scope
• Switch On and Data Acquisition Phase
• Lesson learnt. Insure before instrument
commissioning starts the following:
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Basic Instrument Health check
Verification Space to Ground Links XB
End to End functional data flow verification
Communication Scenario Verification
Opportunistic feed to processor and DPGS
PLM-Health Check + SODAP-RF
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SODAP Tasks
For both ESAC and SVALSAT :
• Check RF-links and budget
• Verify XB masks and behaviour at high low
elevation and identify operational constraints.
• Confirm correctness timing of station and PLM
XB scheduling
• Exercise the different scenarios foreseen in
Communication Baseline Doc
• Exercise autonomous downlink and OBSW
reset
• Verify Data delivery to DPGS
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SODAP Team(1)
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SODAP Team(2)
+ Insa DPGS Operation Team at ESAC
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SODAP Timeline (1)
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SODAP Timeline (2)
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SODAP Procedures (1)
Described in:
• Plan for RF activities during SMOS SODAP
SO-PL-ESA-GS-6515
• SMOS SODAP-RF Procedure Issue 0 Draft 2
SO-GS-ESA-TP-6623
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SODAP Procedures (2)
ESAC
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SODAP Procedures (3)
SVALSAT
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SODAP Week 0
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PLM-Health Check
• Also known as Pre-SODAP
• Implemented week 0 following switch-on
• All OK. See Presentation by FOS
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SODAP Week 1-2
RF and scenarios
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Preliminary outcome ESAC (0)
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Preliminary outcome ESAC (1)
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Preliminary outcome SVAL (2)
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Preliminary outcome (3)
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Preliminary outcome (4)
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Preliminary outcome (5)
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Preliminary outcome (6)
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All 27 tests executed.
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More than 50 Gbyte data acquired and analysed.
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135 XB passes have been scheduled
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Functional chain OK (timing, dependency on elevation) i.e.
no operational constraint identified.
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Timing setting tuned at LOS
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Different setting of stuffing data with good results (TBC)
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SVAL XB tracking using SB for initial lock tested
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Preliminary outcome (7)
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ESAC links budgets and behavior at different elevation
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Preliminary outcome (8)
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SVALSAT RF links budgets and behavior at different
elevations
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Preliminary outcome (9)
SVALSAT Conclusion
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The Eb/No observed is between 15 and 20 dB over all passes
taken. This shows that there is a large system margin. At 15 dB
Eb/No the IF input level is -40 dBm and the antenna tracking
receiver SNR is about 17.5 dB. The threshold SNR for antenna
autotrack is 10 dB. This means that there is a system margin of
7.5 dB.
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Preliminary outcome (10)
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Data continuity checked, major
problems observed since data is
lost on-board on MM partition 3
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Observations working list(1)
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Informal working list of observations to be changed to
formal at subsystem level OBS/AR/NC/SPR if/as
needed.
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List will be cleaned up at end of SODAP
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Major issues from SODAP point of view are:
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Missing Packet detected (problem with on-board
MM writing) (see presentation from FOS)
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Duplicated/lost XB_DOWNLINK to SVALSAT
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Occasional crashes of DAS acquisition
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Inconsistent performance of E2E WAN transfer
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Observations working list(2)
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Preliminary Conclusions
• The System can deliver XB data to support
IOCP
• Both ESAC and SVAL scenario feasible
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Recommendations
(both Short and long
term)
1. Initiate IOCP with NRT Communication scenario 2
orbit overlap
2. Address problem in acq. part of DAS to make it robust
or consider alternate procurement.
3. Initiate implementation of OBSW modifications to cope
with MM write error and partition disabling issues
4. Complete performance evaluation of NRT WAN link.
5. Decouple XB station commanding from data
dissemination
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Thanks
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Thanks to the all Team for hard work and long hours
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