Smos l1 processor prototype phase 5 sodap activities
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SMOS L1 Processor Prototype Phase 5 SODAP Activities PowerPoint PPT Presentation

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SMOS L1 Processor Prototype Phase 5 SODAP Activities. L1PP Team José Barbosa 1 , António Gutiérrez 1 , Rita Castro 1 , Sofia Freitas 1 , 1 DEIMOS Engenharia. Results to presented were obtained during the 3 SODAP Weeks, as well as in the last Week of LEOP

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SMOS L1 Processor Prototype Phase 5 SODAP Activities

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SMOS L1 Processor Prototype Phase 5SODAP Activities

L1PP Team

José Barbosa1, António Gutiérrez1, Rita Castro1, Sofia Freitas1,

1DEIMOS Engenharia

Results to presented were obtained during the 3 SODAP Weeks, as well as in the last Week of LEOP

Studies until now have been mostly qualitative

Week 00

1st On-Ground Calibrated Image

  • Using IVT data (Stability 11), on-ground calibration files were produced:

    • G and J+ Matrices (for Image Reconstruction)

    • Correlated Noise Injection (for Calibration)

  • Switch On () dump at ESAC was processed by L1PP, resulting in an image at first try



Week 01

Preliminary In-Orbit Calibration

  • Due to the CMN locking problems, a patch was done on the Correlated Noise Injection file.

    • This in-orbit calibration file replaced the on-ground calibration one

Patched FWF Amplitude from In-Orbit Calibration

FWF Amplitude from In-Orbit Calibration

Comparison with IVT

Week 01

Effects of In-Orbit Calibration

(Patched) In-Orbit Calibration

On-Ground Calibration

Diffs. Between On-Ground and In-Orbit

  • Australia Coastline

  • No Flat Target Applied

  • No Foreign Sources Removed

Week 02

First Sky View

  • 2 mins in inertial pointing to (a, d) = (154.8, 32.3) deg, starting at 7:53:00

    • However, the instrument was pointing to a flat zone of the sky for more than those two mins.

Average TB for each scene in External Observation.

Dashed zone corresponds to Inertial Pointing

(H-pol; Blue – AF-FOV; Green - Hexagon)

Antenna Boresight for H-pol

Week 02

First Sky View (2 Mins Inertial)

  • External Target imaging processed with

    • No Flat Target applied

    • (Patched) In-Orbit Calibration

    • No U-noise correction

Radiometric Sensitivity (H-pol)

TB for scene with smaller standard deviation (H-pol)

-> Similar results as in IVT;

-> For the Time Averaged Temperature, T = 5.87 K, with s = 4.32 K

-> Even for “poorly” calibrated data, the Radiometric Sensitivity is within good limits!

Week 02

First Sky View

First Flat Target ADF

  • Criteria used by L1PP v3.2 to generate Flat Target ADF:

    • Sky pointing

    • RMS for pointing direction < 0.5 K

L1PP generated FTTs with sky scenes obtained with non-inertial attitude

Australia Coastline

- No Foreign Sources Removed

Flat Target generated with L1PP 3.2 criteria

Flat Target generated with Inertial Pointing


3.5 K difference due to different scenes selected to generate FTT

Week 02

LO Calibration Sequence/Calibration Consolidation

  • 20th November – 1st In Orbit Calibration

  • 4th December – 1st Local Oscilator sequence

  • L1PP identified the sequences and consolidated them into a Correlated Noise Injection Product

Coastlines and lakes well defined!

Week 02

LO Events

Several events where the LO lost lock were recorded in week 02 and were shown to be associated with the South Atlantic Anomaly and Antarctica

Week 02

LO Events Tracking

Two new mechanisms were proposed by ESA/CASA:

  • Events can be recognized when both LO Lock and LO Power flags are raised in the telemetry.

    • Method has been implemented in L1PP

    • Only condition of two active flags can be used (just one flag raises many false positives)

    • 3 out of 7 events recognized

  • LO locked to incorrect frequency can be tracked by comparing each segment 1-spacing correlations with hinge correlations

    • Being implemented in L1PP

  • Both methods must be used in conjunction

Week 02

RFI detection

Two new mechanisms are being studied:

  • T3 and T4 (very noisy)

    • System Temperatures Average (still some false positives)

Week 02

First orbits with LO calibration, after Switch On on 3rd December

  • First Calibration Data collected at 2009-12-04 at 04.05

  • LO sequence every 6 minutes (total of 93 sequences used for spline)

    • (example of FWF phases collected for baseline A_02xB_15)

  • Processed all science data collected after first LO calibration was received (used also PMS and FWF amplitude calibration data from 20th November)

  • Week 02

    First orbits with LO calibration, after Switch On on 3rd December

    • Strong Focusing of RFIs observed but still strong perturbation of images

    Week 02

    First orbits with LO calibration, after Switch On on 3rd December

    • Image taken before LO calibration was available

    • (scale reduced to enhance RFIs)

    Week 02

    First orbits with LO calibration, after Switch On on 3rd December

    • Image taken after LO calibration was available

    • (scale reduced to enhance RFIs)

    L1PP Performance

    Data Collected in L1PP machine at ESAC, 24 h of simulated data w/calibration

    • 1 core

      • Average L1a to L1b: 2455.56 s

      • Average L1b to L1c: 8263.89 s

      • Average L1a to L1c: 10719.4 s

    • 4 cores

      • Average L0 to L1a: 33.37 s

      • Average L1a to L1b: 1006.40 s

      • Average L1b to L1c: 3094.44 s

      • Average L0 to L1c: 4134.22 s

    L1PP Performance

    • L1a

      • Solved segmentation fault caused by large quantities of TLM_1A files in cache.

      • Calibration sequences correctly detected by L1PP

      • Implementation of preliminary algorithm to track LO events

    • L1b

      • Implemented Sun Removal in the back of the instrument

      • Flat Target Generator corrected to use only scenes in inertial pointing to generate FTTX ADF

      • Conclusions from last UPC/DME xval, wrt to (u,v) frame in GMAT generation has been confirmed by In-Orbit data (no mirored images)

    • L1c

      • Performance of Geolocation routines scales well with number of processor cores, urgent tasks can be completed in almost real time.

    New Tasks

    The following set of tasks has been added to the Commissioning Plan for the L1PP Team

    • L1a

      • Continue tracking LO events and update algorithm accordingly

      • Check behaviour of L1PP when L0 packets are missing or OBET jumps

    • L1b

      • Start analysing performance of Foreign Sources Removal algorithms

      • RFI Mitigation algorithms

    • L1c

      • Provide data for L2 teams, upon request

    Annex – Images Collected

    Full Atlantic

    Annex – Images Collected

    North America

    Annex – Images Collected

    South America and Australia

    Annex – Images Collected


    Annex – Images Collected

    South Pole

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