Calibration and Validation

Sentinel-1 SAR Technical Guide - Cal Val

Sentinel-1 product commissioning starts right after the launch and encompasses the verification, calibration and geophysical validation of the products:

  1. IPF and product verification encompasses:
    • Verification of the L0, L1 and L2 product format and main annotations
    • Product family consistency, e.g. verification of the consistency of measurement for GRD HR, FR and MR.
    • Verification of the main processing algorithms:
      • Processing algorithm (Doppler estimation, focusing, ground range projection, debursting, swath stitching)
      • Radiometric correction ( elevation antenna patterns, TOPS scalloping, range spreading loss, etc.)
    • IPF normalization:
      • Verification of the image dynamic and IPF gain setting
      • Sub-swath radiometric merging
      • Product performance assessment:
        • Point target impulse response function analysis (spatial resolution and sidelobes )
        • Ambiguity analysis (range and azimuth)
        • Radiometric resolution and equivalent number of loss measurement
        • Noise equivalent radar cross-section assessment
        • Geometric assessment
    • Burst synchronisation assessment
  2. L1 product calibration encompasses:
    • absolute and relative radiometric calibration
    • polarimetric calibration
    • geometric calibration
  3. L2 geophysical validation encompasses:
    • Verification of the geophysical variables against independent external measures like modal data, buoys or other EO data source

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