BPS L1 SAR ATBD - Algorithms Theoretical Baseline Document#
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Authoritative document
This page is the web-rendered version of BIO-BPS-L1-SAR-ATBD-ARE-010165 issue 1.2.4 dated 27 March 2026.
Document information
Field |
Value |
|---|---|
Title |
BPS L1 SAR ATBD - Algorithms Theoretical Baseline Document |
External reference |
|
Issue |
1.2.4 |
Date |
27 March 2026 |
Pages |
162 (authoritative PDF) |
Recipients
Name |
Organisation |
|---|---|
Cristiano Lopes |
ESA – ESRIN |
Michele Caccia |
ESA – ESRIN |
Muriel Pinheiro |
ESA – ESRIN |
Prepared by
Name |
Organisation |
|---|---|
Riccardo Piantanida |
|
Davide D’Aria |
|
Paolo Mazzucchelli |
|
Pau Prats |
|
Jun Su Kim |
|
Marc Jäger |
|
Felipe Betancourt |
Checked by
Name |
Organisation |
|---|---|
Davide D’Aria |
Approved by
Name |
Organisation |
|---|---|
Davide D’Aria |
Change history
Date |
Issue |
Change summary |
Author |
|---|---|---|---|
2021-11-15 |
1.0 |
First issue of the document |
Riccardo Piantanida |
2022-03-23 |
1.1 |
CDR1 issue of the document Description of framing strategy updated (sec. 6.1) Alignment with latest L1 GPP ATBD updates: Reference included regarding the computation of the CASP based on the CDASP (sec. 4.6.1) Reformulation of internal instrument channel imbalance correction based on ICAL data (sec. 3.6, 4.2.3) PDR1-2-51, PDR1-3-28: Details regarding the various options for ionosphere height determination added (sec. 4.10.3) PDR1-2-52: Chirp function various sources clarified (sec. 4.1.2) PDR1-3-26: SWST replaced with SWP (sec. 4.2.1) PDR1-3-30: Details about quick-looks generation added (sec. 5.1.1) PDR1-3-31, PDR1-3-34: Open points collected in an appendix section (sec. 8) PDR1-3-32: Raw Data Correction inputs and outputs clarified (sec. 3.4) PDR1-3-35: Instrument Replica Derivation inputs and outputs clarified (sec. 3.6.3) PDR1-3-38, PDR1-3-51: Orbit and attitude data management and EO CFI usage clarified (Sec. 3.7, 6.4) PDR1-3-39: Back-geocoding section fully reviewed, harmonized with other BPS Processors and integrated where needed (Sec. 3.8) PDR1-3-41: Details about RFI mitigation baseline configuration added (sec. 4.1) PDR1-3-42: Wrong equation removed (sec. 4.3.1) PDR1-3-43: Antenna pattern added in input (sec. 4.3.2) PDR1-3-44: Details about DC estimation block size baseline configuration added (sec. 4.3.2) PDR1-3-45: Azimuth resampling remodulation step added (sec. 4.5) PDR1-3-46, PDR1-3-49: Details about azimuth resampling step added (sec. 4.5, 6.3) PDR1-3-50: Coordinate Frames and Coordinate Frame Transformations section removed to avoid duplications and inconsistencies w.r.t. applicable documentation [AD2] (Sec. 6.6) PDR1-3-52: Performances analyses sections removed and demanded to reference documentation (ALL) PDR1-3-53: Details about space-variant threshold added (sec. 4.1.1) PDR1-3-54: Link to previous studies on RFI mitigation algorithms underlined (sec. 4.1.3) PDR1-3-56: Details about quality parameters computation and optimization algorithm added (sec. 4.3.2) |
Riccardo Piantanida |
2022-05-23 |
1.1.1 |
Post-CDR1 issue of the document CDR1-058, CDR1-085: Details on orbit and attitude extraction step added (Sec. 3.7, 6.5) CDR1-059: Rule for selection of direction geocoding solutions corrected (Sec. 3.8.1) CDR1-060: Nadir direction formula corrected (Sec. 3.8.3.2) CDR1-061: Terrain slope description aligned with formulas (Sec. 3.8.3.3) CDR1-062, CDR1-112, CDR1-114: RFI mitigation step description improved and aligned to latest evolutions; main configuration parameters added to inputs list (sec. 4.1) CDR1-063: Computation of unit vector normal to the current pointing plane updated (sec. 4.3.1) CDR1-065: Correct sequence of Azimuth Resampling and Doppler Centroid Estimation steps clarified (sec. 2.3, 4.5) CDR1-066: Quicklook generation procedure updated to have more homogeneous results (sec. 5.1.1) CDR1-067: Open points on ionospheric calibration step added (sec. 8) CDR1-068: Open point on BAQ decoding closed, reflecting corresponding action taken at BIOMASS L1 GPP project level (sec. 3.2, 8) CDR1-069: Details on interpolation filters constraints added (sec. 6.3); details about specific solution adopted for azimuth resampling step added (sec. 4.5) CDR1-070: Details about PARC processing added, related open point added (sec. 4.2.4, 8) CDR1-079: Orbit spline interpolator increased to 5th order (sec. 6.4) CDR1-082: Note on first transmitted pulse added (sec. 3.3) CDR1-083: Open point on instrument replica derivation added (sec. 8) CDR1-084: Open point on instrument internal channel imbalance (sec. 8) CDR1-086: Figure updated to add antenna pattern (sec. 4.3.2) CDR1-087: Threshold used to select ionosphere height estimation method made configurable (sec. 4.10.3) CDR1-113: Morphological operators usage in RFI mitigation step clarified (sec. 4.1.1) CDR1-144: Section with considerations on back-geocoding sampling grid added (Sec. 3.8.3) CDR1-188: Sequence of operations implemented to compute number of looks and filter shape clarified. (sec. 4.10.2.1) CDR1-225: List of parameters retrieved by the back-geocoding step added; links to L1 products annotations added (Sec. 3.8.4) |
Riccardo Piantanida |
2023-03-20 |
1.1.2 |
Post-FAT1 issue of the document Alignment with latest L1 GPP ATBD (I/R 2/2) updates: Clarification concerning azimuth mis-pointing between polarizations added (sec. 4.6.1) New section to describe the updates in the ionospheric filtering step (sec. 4.10.5) Clarification on the integration of the IRI model in the GPP in order to retrieve the ionospheric height (sec. 4.10.6) BPSCDR1-10, BPSCDR1-11, BPSPDR2-83: Document fully reviewed to be aligned to latest issues of BPS L1_PFD and AUX_FMT documents, adding input and output details tables for each processing step (ALL) BPSCDR1-2: Added clarification on Doppler Centroid differences between polarizations (sec. 4.3.1) BPSCDR1-3: Removed quick-look percentile clipping (sec. 5.1.1) BPSCDR1-38: Clarified details about peak interpolation function (Sec. 3.4.2) BPSCDR1-39: Added reference to RDB (sec. 1.6, 3.2.2) |
Riccardo Piantanida |
2024-01-19 |
1.1.3 |
Delta-FAT2 issue of the document DLR members added to authors list Alignment with latest L1 GPP ATBD (I/R 3/0) updates: Antenna pattern compensation description updated in order to match current implementation (sec. 4.6) Improved description of mathematical details for ionosphere calibration step (sec. 4.10) Improved description of autofocus approach (sec. 4.11) BPS-221: Completed alignment with AUX_FMT and L1_PFD document (ALL) BPSFAT1-80: Improved description of IRI model usage (sec. 4.10.6) |
Riccardo Piantanida |
2024-05-17 |
1.1.4 |
Post-Delta-FAT2 issue of the document BPS-505: Clarified strategy for back-geocoding step (sec. 3.6.3); updated description of LUT in L1 Post-Processing step (sec. 5.1) BPSCDR1-16: Added note on Gaussian filter size limitations (sec. 4.10.5) BPSFAT1-80: Added clarification on IRI model usage (sec. 4.10.6) |
Riccardo Piantanida |
2024-09-06 |
1.1.5 |
FAT3 issue of the document Removed references to Phase Gradient Autofocus (PGA) (sec. 4.11) For each section, added in input/output tables references to intermediate products names, in order to have a link with the complete list reported in BPS_SDD (ALL) |
Riccardo Piantanida |
2024-12-13 |
1.1.6 |
Post-FAT3 issue of the document Added clarification on RAW data corrections (sec. 3.3) Updated reference frame for orbit and attitude from PEF to EF and added details on management (sec. 3.5) Added section on 2D antenna patterns extraction (sec. 3.6) Added formulas for polarimetric corrections (sec. 4.9) Added details on ionosphere height estimation strategies (sec. 4.10.2.3.3) Added details on external TEC map management (sec. 4.10.3.2) Added details on blocketization strategies (sec. 4.10.1, 6.1) Overall update to input/output tables to clarify intermediate products references (ALL) |
Riccardo Piantanida |
2025-03-07 |
1.2.0 |
Post-Delta-FAT3 issue of the document backgeocodingPosting removed from Back-geocoding step inputs (Sec. 3.7) Added clarification of potential future enhancements of ionospheric calibration blocketization strategy (sec. 4.10.1) |
Riccardo Piantanida |
2025-06-10 |
1.2.1 |
Post-launch issue of the document Added link to [AD6] applicable document (sec. 3.4) Updated conventions used for L1a and L1b quick-looks generation (sec. 5.1.1) |
Riccardo Piantanida |
2025-07-23 |
1.2.2 |
Post-launch issue of the document (associated to BPS V4.0.0) Removed unused configuration parameters (sec. 4.6) Added possibility to make blocks size and overlap configurable (sec. 4.10.1) |
Riccardo Piantanida |
2025-11-28 |
1.2.3 |
Post-launch issue of the document (associated to BPS V4.2.0) Added details on new processing options for RFI mitigation step and on annotated RFI statistics (sec. 4.1) Added details on range delays corrected during range compression step (sec. 4.2.2) Added clarifications on Doppler Centroid combined method fallback and polarization management strategies (sec. 4.3.2) Added section on management of geomagnetic equator crossing during ionospheric calibration step (sec. 4.10.3.3) List of open points updated (removing closed ones) (sec. 8) |
Riccardo Piantanida |
2026-03-27 |
1.2.4 |
Post-launch issue of the document (associated to BPS V4.4.0) Added detailed formulas for annotated RFI statistics (sec. 4.1) Added in/out-of-band power ratio computation step (sec. 3.2.5) |
Riccardo Piantanida |