Algorithm Level-1 SLC to Level-1B XSP cross spectrum Sentinel-1

This page stands as the A.T.B.D. (Algorithm Technical Baseline Document) for Sentinel-1 Level-1B product generated at IFREMER .

This ATBD describes the processing steps to transform Sentinel-1 SLC (Single Look Complex) product into a Level-1B XSP. Most of the steps applied in Ifremer SARWAVE Level-1B XSP processor are also described in the official ESA OSW ATBD, see Jonhsen et al. [2021].

Overview of the processing steps

• Processors steps overview

Links to detailed processing step descriptions:

Deramping of SLC signal: step 0.1

• Deramping of digital numbers

Tiling burst into tiles: step 0.2

• uniform ground tiling for Sentinel-1 SLC burst

Computation of calibrated denoised sigma0: step 1 and 2

• Computation of calibrated denoised sigma0

Land detection: step 3

• Compute land mask

Bright target mitigation: step 4

• Bright-Target mask computation

Compute modulation (and Normalized Variance): step 6

• Complex modulation signal

Sub-tiling: step 7

• Divide tiles into sub-tiles

Compute modulation: step 8 and 9

• Computation of azimuthal Doppler centroid
• Computation of centered and normalized Doppler spectrum
• Normalization of the Doppler spectrum by the Impulse Response of the instrument

Sub tile granularity operations: steps 10-11-12-13-14

• Computation of look cross-spectra (WV and IW products)

Computation of the azimuthal cut-off

• Azimuthal cutoff computation

Computation of CWAVE parameters

• Computation of CWAVE parameters

Computation of MACS parameters

• Computation of MACS parameters

Last documentation build: Feb 09 2024 at 16:53