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
SPOD_SYSTEM_v1.11x	14/06/2021	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
SPOD_SYSTEM_v1.10x	02/02/2020	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
SPOD_SYSTEM_v1.9.x	16/12/2020	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)
SPOD_SYSTEM_v1.8.x	23/09/2020	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
SPOD_SYSTEM_v1.7.x	29/07/2020	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)
SPOD_SYSTEM_v1.6.0	06/05/2020	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)
SPOD_SYSTEM_v1.5.5	14/10/2019	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)
SPOD_SYSTEM_v1.5.4	06/03/2019	Update GPS satellite and transponder DBs and include new GPS ANTEX according to the launch of the satellite GPS-74
SPOD_SYSTEM_v1.5.3	07/11/2018	Update the GPS databases to align them with the latest changes in the GPS constellation.
SPOD_SYSTEM_v1.5.2	30/10/2018	Implementation and operational usage of the SENTINEL-2 Geocentric YSM attitude mode.
SPOD_SYSTEM_v1.5.1	04/10/2018	Implemented a satellite re-radiation model
SPOD_SYSTEM_v1.5.0	05/06/2018	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
SPOD_SYSTEM_v1.4.2	26/02/2018	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
SPOD_SYSTEM_v1.4.0	28/11/2017	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	CPOD SERVICE
Software
Name and version	NAPEOS
Arc cut
Arc lengths	32 h
Handle of Manoeuvers	Manoeuvres are calibrated in the POD process
Handle of Data gaps	Yes
Reference System
Polar motion and UT1	IERS finals2000A.data
Pole model	IERS 2010 Conventions
Precession/Nutation	IERS 2010 Conventions
Satellite Reference
Mass and centre of gravity	Variable with input from FOS
Attitude Model	Quaternions
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
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	msise00
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	n/a
GPS measurements
Relativity	Applied (IERS 2010)
Sampling	10 s
Observations	Iono-free linear combinations of phase and pseudo-range measurements
Weight	0.8 m (pseudo-range) / 10 mm (carrier-phase)
Elevation angle cut-off	7 degrees
Down-weighting law	None
Antenna phase-centre wind-up correction	Applied
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	n/a
DORIS coordinates	n/a

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