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Isotropic RFI detection

Isotropic RFI detection. Jean-Luc Vergely (ACRI-ST) Claire Henocq (ACRI-ST) Philippe Waldteufel (LATMOS). Introduction. Principal aims of this study : Looking for strong isotropic source -> RFI St1, A3 and A4 analysis. Data set. Data set to be used 2010 and 2011 reprocessed data.

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Isotropic RFI detection

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  1. Isotropic RFI detection Jean-Luc Vergely (ACRI-ST) Claire Henocq (ACRI-ST) Philippe Waldteufel (LATMOS)

  2. Introduction Principal aims of this study : Looking for strong isotropic source -> RFI St1, A3 and A4 analysis.

  3. Data set Data set to be used 2010 and 2011 reprocessed data. Philosophy: -> use L1c browse products for global analysis: source detection on ocean and land targets.

  4. Data set Land/ocean L1c browse products L1c browse products over two years (2010 and 2011) : - four polarizations (in FP mode) at the same geometry - TB at antenna level - TB at 42.5° incidence - TB errors Allow global analysis on 5 FOV zones Zone 3 Zone 5 Zone 4 Zone 1 Zone 2

  5. Introduction • St1,A3 or A4 emission • Is the signal observed on descending and ascending orbits ? • Is the signal isotropic? • Is the signal variable or constant ? • Is the signal spatially coherent ?

  6. Isotropic source Detected in the 5 zones in ascending and descending -> good azimuth coverage. Normalization to be done because of using zones affected by different OTT correction. Applying a threshold. St1 and A4 For A3 : ascending and descending zone 3

  7. St1 isotropic source Isotropic source detection

  8. St1 isotropic source Isotropic source detection

  9. St1 isotropic source

  10. A4 isotropic sources Threshold of 3 K Only RFI …

  11. A4 isotropic source Isotropic source detection

  12. A3 asc/desc sources Threshold of 7 K

  13. A3 isotropic source Isotropic source detection

  14. Principal conclusions Looking for RFI from St1, A3 and A4 SMOS measurements: isotropic sources For RFI detection : do not use A4 (correlated with A3). Only few isotropic sources have been detected. Constant isotropic source for St1 could be RFI. Distinction between sources and Gibbs effect to be done. -> further works : play with different thresholds (adaptation of the threshold according to the target (ocean or land).

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