Transcript The MIRAS optical harness for SMOS

Payload Functionality during SODAP:
preliminary review
SMOS Project Team, ESTEC/ESAC/ESRIN
EADS-CASA Espacio, UPC, TKK and DEIMOS
SMOS CEC, ESAC
Presented by: M. Martín-Neira
SMOS Commissioning KP-0, ESAC, 9 December 2009
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CONTENTS
- On-board Subsystems Check
- CMN A2 Strategy
- IOCP High Level Planning
- RFI
- Next Steps
SMOS Commissioning KP-0, ESAC, 9 December 2009
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LICEFs
- All LICEF are working well as can be deduced from the PMS values
A2 segment right after switch-on 17-Nov-09
(6 LICEFs); To=10C
U-noise
LO locked here
All other
segments like
this one
Dual Pol: H and V
SMOS Commissioning KP-0, ESAC, 9 December 2009
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NIRs
- All three NIR units are working fine, within a few Kelvin from each
other
NIR V channels
right after switch-on 17-Nov-09
To=10C
LO locked here
a few
Kelvin
NIR H channels
similarly
initialisation
SMOS Commissioning KP-0, ESAC, 9 December 2009
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MOHA
- All optical links are fine, as deduced from the correlations
over the Antarctica coast line and from redundant correlations
(manual check)
LCF-A05  LCF-A06
SMOS Commissioning KP-0, ESAC, 9 December 2009
LCF-A17  LCF-A18
4/17
On Redundant Baselines
- Redundant baselines are very similar to each other, for all
spacings (may help to reduce LO noise injections)
LCF-A04  LCF-A19
SMOS Commissioning KP-0, ESAC, 9 December 2009
LCF-A05  LCF-A20
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CAS
- The on-board calibration system is working also fine
- The false lock of A2 was discovered during the first CAS operation
Normal Correlations during Calibration
SMOS Commissioning KP-0, ESAC, 9 December 2009
Very Low Correlations with A2 Segment
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CMN
- The CMNs are working fine
- However they seem to be affected by radiation and lose the LO
lock from time to time
- All CMNs recover in 5 or less epochs (this is the affected data) …
- … except A2 which locks onto a secondary frequency
From CAS measurements:
1 / π Δf T < 20 / 6500
Δf > 6500 / 20π T = 86 Hz
SMOS Commissioning KP-0, ESAC, 9 December 2009
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Proposed Strategy for CMN A2
Now at 22C
A2 unlocks
Relocks OK
NOK
From ground measurements it
is known that CMN A2 locks
better at colder temperatures
Go down to
18C
Switch Arm-A
OFF - ON
A2 unlocks
NOK
Review
Situation
Relocks OK
Continue
Commissioning
SMOS Commissioning KP-0, ESAC, 9 December 2009
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Impact on IOCP High Level Plan
- Instrument commissioning will finish 1 week later than expected
- Pseudo-operational phase is shortened by 1 week accordingly
1
2
2b
3
0 KP0
Mon 23-Nov-09
4X
4
Mon 21-Dec-09
5
SODAP
6
PAYLOAD
XMAS (24-Dec till 3-Jan)
7
8
Mon 18-Jan-10
9
10
1 KP1
11
Dual-Full
12
13
14
MICRORAD
(WASHINGTON)
Mon 15-Feb-10
15
Mon 15-Mar-10
16
17
Key Point
18
PLM
Switch ON
2 KP2
19
Mon 12-Apr-10
20
21
OCEAN FROM SPACE
(VENICE)
Mon 10-May-10 = Start of Operational Phase
SMOS Commissioning KP-0, ESAC, 9 December 2009
22
3 KP3
L2
Collocation
1 week
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CORRELATOR
- The first correlator test was performed last Monday 7-Dec-2009
- Data to be processed
SMOS Commissioning KP-0, ESAC, 9 December 2009
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RFI – first detections
- Spikes in PMS, NIRs and correlations are produced by interferors
- They seldom saturate the PMS voltages
- Full calibration will allow to better focus the interference signals
SMOS Commissioning KP-0, ESAC, 9 December 2009
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RFI – geographical distribution
- Strong RFI in Europe, Middle East, South-Eastern Asia, Northern Africa
- Smaller localised interferors in other places (even boats)
- America, Antarctica, the Arctic, Greenland, Australia, most of Africa and
Siberia, widely clean
SMOS Commissioning KP-0, ESAC, 9 December 2009
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Interference over Europe
- Some European countries appear much cleaner than others …
SMOS Commissioning KP-0, ESAC, 9 December 2009
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Strong Interferors are Radars
- Signature is periodic …
1st peak
2nd peak
SMOS Commissioning KP-0, ESAC, 9 December 2009
. . . . . Nth peak
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Strong Interferors are Radars
- … and depends on time (SMOS in radar beam)
Legend:
First = 1st peak;
Second = 2nd peak;
SMOS Commissioning KP-0, ESAC, 9 December 2009
0 = no RFI;
1 = RFI
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Next Steps (Week 2b and 3)
- Prepare the procedure to set the instrument temperature down to 18C
- Obtain full calibration parameters (except for temperature coefficients)
- Apply FTT to L1 imaging
- Analyse LO calibration rate
- Assess instrument absolute accuracy and sensitivity
- Clearly L1 needs to enhance RFI detection and cleaning
- Verify the Corbella Equation (see next slides)
SMOS Commissioning KP-0, ESAC, 9 December 2009
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HUT-2D verification of Corbella equation
- Try to repeat the same exercise with SMOS …
SMOS Commissioning KP-0, ESAC, 9 December 2009
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