1/17SMOS Commissioning KP-0, ESAC, 9 December 2009

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

2/17SMOS Commissioning KP-0, ESAC, 9 December 2009

CONTENTS

- On-board Subsystems Check

- CMN A2 Strategy

- IOCP High Level Planning

- RFI

- Next Steps

3/17SMOS Commissioning KP-0, ESAC, 9 December 2009

LICEFs

A2 segment right after switch-on 17-Nov-09 (6 LICEFs); To=10C

LO locked here

Dual Pol: H and V

U-noise

- All LICEF are working well as can be deduced from the PMS values

All other segments like

this one

4/17SMOS Commissioning KP-0, ESAC, 9 December 2009

LO locked here a few Kelvin

NIR V channels right after switch-on 17-Nov-09

To=10C

initialisation

NIRs

- All three NIR units are working fine, within a few Kelvin from each other

NIR H channels similarly

5/17SMOS Commissioning KP-0, ESAC, 9 December 2009

MOHA

- All optical links are fine, as deduced from the correlations over the Antarctica coast line and from redundant correlations (manual check)

LCF-A17 LCF-A18LCF-A05 LCF-A06

6/17SMOS Commissioning KP-0, ESAC, 9 December 2009

On Redundant Baselines

- Redundant baselines are very similar to each other, for all spacings (may help to reduce LO noise injections)

LCF-A05 LCF-A20LCF-A04 LCF-A19

7/17SMOS Commissioning KP-0, ESAC, 9 December 2009

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 Very Low Correlations with A2 Segment

8/17SMOS Commissioning KP-0, ESAC, 9 December 2009

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

9/17SMOS Commissioning KP-0, ESAC, 9 December 2009

Proposed Strategy for CMN A2

From ground measurements it is known that CMN A2 locks better at colder temperatures

A2 unlocks

Now at 22C

Go down to 18C

A2 unlocks

Continue Commissioning

Switch Arm-A OFF - ON

Review Situation

Relocks OK

NOK

Relocks OKNOK

10/17SMOS Commissioning KP-0, ESAC, 9 December 2009

Impact on IOCP High Level Plan

OCEAN FROM SPACE(VENICE)

1 week

SODAP

PAYLOAD

Dual-Full

Key Point

1 2 2b 3

4 5 6

7 8 9 10

11 12 13 14

15 16 17 18

19 20 21 22

KP0

KP2

KP1

KP3

PLM Switch ON

XMAS (24-Dec till 3-Jan)

4X

0

1

2

3

MICRORAD(WASHINGTON)

L2 Collocation

- Instrument commissioning will finish 1 week later than expected- Pseudo-operational phase is shortened by 1 week accordingly

Mon 23-Nov-09

Mon 21-Dec-09

Mon 18-Jan-10

Mon 15-Feb-10

Mon 15-Mar-10

Mon 12-Apr-10

Mon 10-May-10 = Start of Operational Phase

11/17SMOS Commissioning KP-0, ESAC, 9 December 2009

CORRELATOR

- The first correlator test was performed last Monday 7-Dec-2009

- Data to be processed

12/17SMOS Commissioning KP-0, ESAC, 9 December 2009

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

13/17SMOS Commissioning KP-0, ESAC, 9 December 2009

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

14/17SMOS Commissioning KP-0, ESAC, 9 December 2009

- Some European countries appear much cleaner than others …

Interference over Europe

15/17SMOS Commissioning KP-0, ESAC, 9 December 2009

- Signature is periodic …

Strong Interferors are Radars

1st peak

2nd peak Nth peak. . . . .

16/17SMOS Commissioning KP-0, ESAC, 9 December 2009

- … and depends on time (SMOS in radar beam)

Strong Interferors are Radars

Legend: First = 1st peak; Second = 2nd peak; 0 = no RFI; 1 = RFI

17/17SMOS Commissioning KP-0, ESAC, 9 December 2009

- 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)

Next Steps (Week 2b and 3)

18/17SMOS Commissioning KP-0, ESAC, 9 December 2009

HUT-2D verification of Corbella equation

- Try to repeat the same exercise with SMOS …