POD System Baselines and Reprocessing Campaigns

Sentinel-2 MSI Technical Guide - POD System Baselines and Reprocessing Campaigns

The following table shows the baselines of Copernicus POD systems with the deployment date and a summary of the change description included in the new system which affect the SENTINEL-2 mission. A full description of the changes is included in the Product Handbook. Only changes that might affect the quality of POD products for final users are outlined here below. The table is ordered from the most recent system to the oldest.

Table 1: Copernicus POD System baselines affecting SENTINEL-2
Version Date Change description



Updated quality control for the EGP

Generation of S-6A NTC products

The POD configuration of S-6A ROE products has been modified (GPS with ISB and 30 s observations)

New ANTEX files for Sentinels satellites, GNSS satellites and SENTINEL-6A LRR have been deployed

The macro model for SENTINEL-6A satellite has been updated

The Sentinels transponder DB (sentransp.dat) has been updated



To change the orbit parametrization of STC and NTC products to:

Estimate 16 empirical accelerations (constant, sine and cosine) in along and cross-track.
Fix the solar radiation pressure coefficient (per satellite
To estimate a single drag coefficient

The macro-model of SENTINEL-1 has been updated to account for changes in the areas of the SAR and solar arrays.

The albedo model has been updated with new mean VIS/IR maps using CERES data



Update the thermospheric winds model to HWM14

Update the planetary ephemerides to DE-421

Update GPS ANTEX file (igs14_2134.atx), GPS transponder DB (transp2136200.dat), and GPS satellite DB (satellite 2136200.dat)

Update SENTINELs ANTEX file (sen08_2133.atx)



The system makes use of the GNSS products delivered by the new and backup external GNSS
providers (EGPs). This applies to the offline and S3 NRT CPOD production.

The header of the clocks RINEX files has been updated to show the number of analysis clock references even if this number is equal to zero



Correct a bug in the computation of the water vapour for tropospheric estimation
(impacting only the SLR residuals analysis)

Update GPS ANTEX file (igs14_2114.atx)



The system has been updated to include the new models

Accuracy improvement on the S-2 PREORB products

Corrected an under performance when merging GNSS 15M and 24H input files on the generation of the NRT products

Update GPS ANTEX file (igs14_2101.atx), GPS transponder DB (transp2104300.dat), and GPS satellite DB (satellite2104300.dat)



Quaternions products (AUX_PROQUA) can be generated by the system

Alignment of EGP 15M GPS and broadcast clocks products to EGP 24H GPS clocks products during the generation of NRT orbits

Update decoder to properly handle the GPS week rollover occurred on 07/04/2019

Update GPS ANTEX (igs14_2062.atx), GPS transponder DB (transp2062400.dat) and GPS satellite DB (satellite2062400.dat)



Update GPS satellite and transponder DBs and include new GPS ANTEX according to the launch of the satellite GPS-74



Update the GPS databases to align them with the latest changes in the GPS constellation.



Implementation and operational usage of the SENTINEL-2 Geocentric YSM attitude mode.



Implemented a satellite re-radiation model



Generate quaternions file merging real and simulated attitudes during data gaps.

Implement new mechanisms to fill EGP/magic gaps in case of FTP/internet failure



Create chains to generate and distribute data for SENTINEL Online

New antex file with small corrections deployed: sen08_1989.atx

New satellite & transponder DBs with small corrections deployed: s3satellite1990100.dat & s3transp1990100.dat

Corrections on S3PODIPF for redundant receiver:

  • The generation of imt2gps file
  • Half cycle ambiguity
  • Decoding S2 L0 data



Removal of temperature effects and configure HW bias to 23.5 m in the decoding tool (IPF)

Correction of half-cycle ambiguities in the decoding tool (IPF)

Align RINEX epochs to GPS time instead of IMT for all the orbital products, but the S-3 NRT ones

SPOD_SYSTEM_v1.3.9 08/11/2017 Implement half cycle bias correction reading info from GPS Auxiliary Data (s-1,-3 and s-2b) or GPS Channel Status data (s-2a)
SPOD_SYSTEM_v1.3.7 11/10/2017 Start processing GNSS RINEX for Copernicus Data Hub, including dissemination mechanisms
SPOD_SYSTEM_v1.3.6 22/08/2017 Implement changes related to Post-Seismic Deformation (PSD)
New antex file deployed with SENTINEL-2B 90-residual computation: sen08_1963.atx
New station database deployed pointing to ILRS2014 coordinate file (ILRS2014-ESOC.crd)
SPOD_SYSTEM_v1.3.5 27/07/2017 Include option to apply Differential Code Biases when using observations different than P1 and P2
SPOD_SYSTEM_v1.3.4 19/06/2017 Generation and distribution of daily operational RINEX
SPOD_SYSTEM_v1.3.3 29/05/2017 New antex file deployed: sen08_1950.atx
New GPS antex file deployed: igs14_1949.atx
Change POD NTC/STC processing chain to avoid using broadcast navigation message information (BRDC) info if IGS/STC orbits available
SPOD_SYSTEM_v1.3.1 27/03/2017 Update header for ITRF14 realization in sp3 orbits generation
SENTINEL-2B Launch (07/03/2017)
SPOD_SYSTEM_v1.3.0 16/02/2017 Deploy a new GPS ANTEX (igs14_1935.atx)
SPOD_SYSTEM_v1.2.0 13/12/2016 Include tool to reduce SAR Annotation Files, SAD PDI files, overlaps and duplicates from archive (affecting reprocessing)
The determination period of NTC products has been reduced from 48 hours to 32 hours (26 hour coverage + 3 hours in each border)
The minimum number of observations per epoch threshold has been modified from 4 to 1 for quality flagging (more appropriate for dynamic orbit determination)
Implement S-2 solar array rotation (rewinding during eclipse)
New gravity field model EIGEN.GRGS.RL03.v2.coef
SPOD_SYSTEM_v1.1.0 20/10/2016 Change Orbit Determination configuration for S-2 NRT orbits to use manoeuvre split arcs in case of manoeuvre
Change timeliness to launch PREORB 100min before predicted ANX
Add CMC handling in sp3 orbit generation
Correct expression of the solar radiation pressure partial derivative in the Box Wing Model
SPOD_SYSTEM_v1.0.10 06/09/2016 Update rsgaConv.bin to make it more robust against missing info in Solar Activity File
SPOD_SYSTEM_v1.0.8 30/05/2016 Solve issue causing occasional incorrect Orbit Number in EOF NRT products
SPOD_SYSTEM_v1.0.0 18/02/2016 Updated GPS DBs and GPS ANTEX (igs08.atx)
SPOD_SYSTEM_v0.10.0 25/01/2016 Include a S-2 Box-Wing Model (previously using constant area)
SPOD_SYSTEM_v0.9.6 14/12/2015 Generate S-2 PREORB products only if there are SAD PDIs in the last 4 hours
Update S-2A ANTEX file
Update S3PODIPF (GPS L0 decoder) to improve accuracy of pseudo-ranges and avoid usage of GPS Ephemeris
SPOD_SYSTEM_v0.9.5 06/10/2015 Configure the quality flagging mechanism for S-2 PREORB products
Deploy updated ANTEX S2A nominal receiver
SPOD_SYSTEM_v0.9.4 25/09/2015 Use constant set of state vectors to produce a proper RESORB for S2, according to ICD
Deploy new ANTEX file with information about S-1A nominal and redundant receiver, and S-2A nominal receiver
SPOD_SYSTEM_v0.9.3 29/07/2015 New attitude mode implemented for S-2A
Start NTC processing 7 days into the past for S-2A
SPOD_SYSTEM_v0.9.2 14/07/2015 Change NTC determination arc from 72 hours to 48 hours
Increase robustness of attitude processing
SENTINEL-2A Launch (23/06/2015)


The following table summarises the different POD models and settings used by the Copernicus POD Service (at GMV).

Table 2: Copernicus POD System models and settings affecting SENTINEL-2
Analysis Centre




Name and version


Arc cut

Arc lengths

32 h

Handle of Manoeuvers

Manoeuvres are calibrated in the POD process

Handle of Data gaps


Reference System

Polar motion and UT1

IERS finals2000A.data

Pole model

IERS 2010 Conventions


IERS 2010 Conventions

Satellite Reference

Mass and centre of gravity

Variable with input from FOS

Attitude Model


GPS antenna reference point (X,Y,Z)

Sentinel-2 properties for GPS POD

GPS antenna orientation (Euler angles, Z,Y,X)

Sentinel-2 properties for GPS POD


Gravity field (static)

EIGEN.GRGS.RL04 TVG (120x120)

Gravity field (time varying)

Drift/annual/semi-annual piece wise linear terms up to degree/order 90

Solid Earth tides

Applied (IERS 2010)

Ocean tides

FES2014 (100x100, 142 tidal constituents)

Atmospheric gravity

GFZ AOD L1B RL06 (100x100)

Atmospheric tides

GFZ AOD L1B RL06 (100x100)

Earth pole tide

IERS 2010

Ocean pole tide

IERS 2010

Third bodies

Sun, Moon, Planets DE-421

Surface forces and empiricals

Radiation Pressure model

Box-wing model (with re-radiation)

Earth radiation

Albedo and Infra-red applied

Atmospheric density model


Radiation pressure coefficient

1 per arc (loosely constrained to 1.0)

Drag coefficients

10 coefficients per day (loosely constrained to 1.0)
15 coefficients for 32 h

1/rev empirical

2 sets per day: in along-track and cross-track direction (with sin/cos signals)
3 sets per 32 h: in along-track and cross-track direction (with sin/cos signals)

Other empiricals


GPS measurements


Applied (IERS 2010)


10 s


Iono-free linear combinations of phase and pseudo-range measurements


0.8 m (pseudo-range) / 10 mm (carrier-phase)

Elevation angle cut-off

7 degrees

Down-weighting law


Antenna phase-centre wind-up correction


Antenna phase-centre variation

Applied (sen08.atx)

GPS parameters

Receiver clocks

Per epoch, every 10 s

Receiver ambiguities

Estimated (fixed)

GPS orbits

Fixed (CODE finals)

GPS clocks

Fixed (CODE finals)

GPS satellite biases

CODE finals

DORIS troposphere


DORIS coordinates



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