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-3 mission. Additionally, the baselines used for the S3PODIPF in charge of the generation of NRT Restituted Orbits (SR___ROE_AX) is included below. 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.
| Version | Date | Change description |
|
SPOD_SYSTEM_v1.10x |
02/02/2020 |
To change the orbit parametrization of STC and NTC products to:
|
|
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). |
|
SPOD_SYSTEM_v1.7.x |
29/07/2020 |
Correct a bug in the computation of the water vapour for tropospheric estimation |
|
Update GPS ANTEX file (igs14_2114.atx) |
||
|
SPOD_SYSTEM_v1.8.0 |
23/09/2020 |
The system makes use of the GNSS products delivered by the new and backup external GNSS providers (EGPs) |
|
The system is able to populate the S3PODIPF operational folders containing GNSS products with products from the backup EGP in case of an outage of the main EGP |
||
|
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_v1.7.0 | 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 |
| The NTC products are now ambiguity fixed | ||
| Accuracy improvement on the S-3 CPF Prediction files for the ILRS | ||
| Creation of the corresponding chains for being able to upload S-3 NRT/STC/NTC/PRCPTF products to the Copernicus Open Access Hub on a daily basis | ||
| 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 |
||
|
QC CPOD-CNES comparisons for S3 NRT & STC CPOD products against CNES MDO solution instead of CNES MGN solution |
||
|
CPOD System able to process CRDs V2 and to generate CPFs V2. Additionally, CPFs V2 distributed to an intended folder inside the external FTP server |
||
|
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. |
|
Update of the Sentinels databases to update the location of the y-axis coordinate of instruments on S-3A to match CNES/DLR configuration. |
||
|
SPOD_SYSTEM_v1.5.1 |
04/10/2018 |
Preparation of the system for the processing of Sentinel-3B. |
|
Implemented a satellite re-radiation model |
||
|
Updated sentinels ANTEX to include information for S3B and updated sentransp.dat to include SLR antex for S3B (the same that is used by S3A) |
||
|
Updated reference orbit of S3B |
||
|
Updated IPF to correctly decode L0 data from both redundant and nominal receivers simultaneously. |
||
|
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_v1.4.3 |
08/05/2018 |
Update the SVL server IP address to trinity server |
|
New satellite & transponder DBs with updated NORAD, COSPAR and SIC IDs for Sentinel-3B: s3satellite2000100.dat & s3transp2000100.dat |
||
|
Sentinel-3B Launch (25/04/2018) |
||
|
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 |
||
|
New s3b icdb was deployed: s3bicdb_1969.xml |
||
|
Corrections on S3PODIPF for redundant receiver:
|
||
|
SPOD_SYSTEM_v1.4.1 |
29/01/2018 |
Create processing chain to process DORIS operationally and DORIS+GPS |
|
Prepare a new version of S3PODIPF with changes to do not use L2C with S-3B during commissioning |
||
|
Create new S-3 interface from CPOD/EGP and LAND centre for S-3B |
||
|
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) |
||
|
Update location of S-3B antenna in DB |
||
| SPOD_SYSTEM_v1.4.1 | 29/01/2018 | Create processing chain to process DORIS operationally and DORIS+GPS |
| Prepare a new version of S3PODIPF with changes to do not use L2C with S-3B during commissioning | ||
| Create new S-3 interface from CPOD/EGP and LAND centre for S-3B | ||
| 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) | ||
| Update location of S-3B antenna in DB | ||
| SPOD_SYSTEM_v1.3.9 | 08/11/2017 | Preliminary version of DORIS processing chain (DORIS-only and DORIS+GPS orbits) |
| 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_v1.3.8 | 30/10/2017 | The S-3B box-wing model has been aligned to S-3A |
| SPOD_SYSTEM_v1.3.7 | 11/10/2017 | Upgrade IPF to update RINEX files version to 3.03 |
| 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 |
| Use 24H orbit file prediction for S3PODIPF near end of interval | ||
| Use Earth Orientation Parameters (EOPs) provided by EGP for S3PODIPF | ||
| Align all EGP clocks to broadcast navigation message for S3PODIPF | ||
| 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_v1.3.2 | 18/05/2017 | Change in CNES RINEX generation process to guarantee continuity between different executions |
| SPOD_SYSTEM_v1.3.1 | 27/03/2017 | Update header for ITRF14 realization in sp3 orbits generation |
| SPOD_SYSTEM_v1.3.0 | 16/02/2017 | Deploy a new GPS ANTEX (igs14_1935.atx) |
| SPOD_SYSTEM_v1.2.1 | 16/01/2017 | The filename of CPF gets the epoch directly from the CPF itself |
| 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). | ||
| New gravity field model EIGEN.GRGS.RL03.v2.coef | ||
| Deploy first version of SLR ANTEX for S-3A based on LRR geometry | ||
| SPOD_SYSTEM_v1.1.1 | 10/11/2016 | Deploy new ANTEX with S-3A information computed by 90 days of residuals |
| The timeliness and coverage of the Medium Orbit Ephemerides Orbit Files (AUX_MOEORB) and Preliminary Platform Data Files (AUX_PRLPTF) has been adapted to the expectations of the S3 PDGS, such that the product with coverage d-2 at 22 hours to d-1 at 24 hours (GPS time) will be delivered before noon on day d. | ||
| The coverage of the Precise Orbit Ephemerides Orbit Files (AUX_POEORB) and Precise Platform Data Files (AUX_PRCPTF) has been changed to d-1 22:00 until d+1 00:00 (GPS time) | ||
| SPOD_SYSTEM_v1.1.0 | 20/10/2016 | 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 SLR stations selection policy to exclude tracking from biased stations |
| Update rsgaConv.bin to make it more robust against missing info in Solar Activity File | ||
| Change Orbit Determination configuration for S-3 STC and NTC to use multi-tracks in case of manoeuvre | ||
| Change timeliness of hourly RINEX for CNES to 4.5 hours after sensing time | ||
| SPOD_SYSTEM_v1.0.8 | 30/05/2016 | Solve issue causing occasional incorrect Orbit Number in EOF NRT products |
| SPOD_SYSTEM_v1.0.7 | 21/04/2016 | Change Quality flags thresholds of Sentinel-3A to align to S-1A and S-2A values |
| Update Sentinel transponder DB to update reference point of SRAL antenna | ||
| SPOD_SYSTEM_v1.0.6 | 20/04/2016 | Updated Sentinel transponder DB with corrected location of GNSS antennae for Sentinel-3A |
| Updated ANTEX including S-3A GPSA receiver using new antenna location, computed from 8 days of NTC executions | ||
| Change timeliness of S3 NTC to 25 days | ||
| SPOD_SYSTEM_v1.0.5 | 13/04/2016 | Updated ANTEX including S-3A GPSA receiver |
| Updated Sentinel transponder DB with corrected information on SLR antenna | ||
| Add ILRS stations 1824, 1888, 1889, 1990 and 7827 to the station DB | ||
| SPOD_SYSTEM_v1.0.4 | 06/04/2016 | Corrected Platform Data File frame of reference |
| SPOD_SYSTEM_v1.0.3 | 05/04/2016 | Corrected decoding of NAVATT files for generating quaternions using Packet Generation Timestamp |
| SPOD_SYSTEM_v1.0.2 | 11/03/2016 | Corrected frame of reference transformation to Satellite Frame of Reference for S-3 |
| SPOD_SYSTEM_v1.0.1 | 08/03/2016 | Updated Sentinel DBs for Sentinel-3A to align to launch values |
| SPOD_SYSTEM_v1.0.0 | 18/02/2016 | Updated GPS DBs and GPS ANTEX (igs08.atx) |
| Included PassSegmentList module to compute Pass Segments for ILRS tracking | ||
| Sentinel-3A launch (17/02/2016) | ||
| Version | Date | Change description |
|
S3PODIPF_v02_23 |
05/11/2020 |
Update decoder to properly handle the GPS week rollover occurred on 07/04/2019 |
|
Implemented a satellite re-radiation model |
||
|
Update SW to correctly decode L0 data from both redundant and nominal receivers simultaneously |
||
|
Alignment of EGP 15M GPS and broadcast clocks products to EGP 24H GPS clocks products during |
||
|
The system has been updated to include the new models |
||
| S3PODIPF_v02_22 | - | No official deployment |
| Sentinel-3B launch (25/04/2018) | ||
| S3PODIPF_v02_21 | 19/02/2018 | |
| NAPEOS configured to skip L2C signals | ||
| Half-cycle ambiguity applied to L1C and L2W observations with information form the Navigation Data Synchronization (NDS) | ||
| Removed temperature corrections on measurements | ||
| Upgrade of GPS L0 data decoding to support the S-3B commissioning | ||
| S3PODIPF_v02_20 | 30/10/2017 | |
| Ready to process S-3B and can be considered part of the frozen pre-launch configuration | ||
| The S-3B box-wing model has been aligned to S-3A | ||
| S3PODIPF_v02_19 | 05/09/2017 | Use 24H GPS orbit file prediction near end of interval instead of GPS broadcast navigation message, thus improving their accuracy. |
| Use Earth Orientation Parameters (EOPs) provided by EGP for S3PODIPF instead of the ones provided by USNO (kept as back-up). | ||
| Align all EGP clocks to GPS broadcast navigation message | ||
| S3PODIPF_v02_18 | 16/01/2017 | The minimum number of observations per epoch threshold has been modified from 4 to 1 for quality flagging (more appropriate for dynamic orbit determination) |
| New gravity field model EIGEN.GRGS.RL03.v2.coef | ||
| A quality check of GNSS input files which was time consuming has been made optional upon user request, reducing slightly processing time. | ||
| S3PODIPF_v02_17 | 06/09/2016 | Increase its robustness against unexpected values in the Solar Activity File retrieved from NOAA |
| Change Orbit Determination configuration for S3PODIPF to use multi-tracks in case of manoeuvre | ||
| S3PODIPF_v02_16 | 27/06/2016 | Correction of issue with platform data file (occasional wrong number of elements in the file) |
| S3PODIPF_v02_15 | 30/05/2016 | NAPEOS input/output folders read from S3PODIPF L1B processing folder |
| S3PODIPF_v02_14 | 10/05/2016 | File permission issue fixed |
| Fix bug affecting products finishing in 59.5 second | ||
| S3PODIPF_v02_13 | 03/05/2016 | File permissions issue fixed |
| XML format issue fixed | ||
| NAPEOS input/output folders made configurable | ||
| S3PODIPF_v02_12 | 06/04/2016 | Corrected selection of RGSA |
| NAVATT time decoding issue solving 1-second time tagging shift with respect to simulated attitude | ||
| S3PODIPF_v02_11 | 17/03/2016 | Changes in retrieval modes in task tables |
| Change configuration of RINEX writer to set correct interval as specified in the Job Order | ||
| S3PODIPF_v02_10 | 07/03/2016 | Change reading process of EOP file |
| S3 NAPEOS attitude corrected, in line with real data attitude | ||
| Sentinel-3A launch (17/02/2016) | ||
| S3PODIPF_v02_09 | 11/01/2016 | Task tables modified (Retrieval Mode set to LatestValCover) |
| S3PODIPF_v02_08 | 04/12/2015 | Fix bug on scaling IMT and decoding performance |
| S3PODIPF_v02_07 | 25/09/2015 | NAVATT inputs are set to optional instead of mandatory |
| S3PODIPF_v02_06 | 03/07/2015 | Several NAPEOS updates to include up-to date models (IERS2010 standards together with new gravity field mode (EIGEN6S) and ocean tide model (EOT11a)) |
| S3PODIPF_v02_05 | 30/01/2015 | Updates in JobOrder's Tags, TaskTables and Product List to align to documentation |
| S3PODIPF_v02_04 | 18/12/2014 | Process NAVATT v3.0 data |
| S3PODIPF_v02_03 | 13/06/2014 | S3PODIPF AR close-out |
The following table summarises the different POD models and settings used by the Copernicus POD Service (at GMV) and CNES.
| Analysis Centre |
||
| Name |
CPOD SERVICE |
CNES |
|
Software |
||
|
Name and version |
NAPEOS |
ZOOM 5.10 |
|
Arc cut |
||
|
Arc lengths |
32 h |
36 h |
|
Handle of Manoeuvres |
Manoeuvres are calibrated in the POD process |
Manoeuvres are calibrated in the POD process |
|
Handle of Data gaps |
Yes |
Yes |
|
Reference System |
||
|
Polar motion and UT1 |
IERS finals2000A.data |
IERS14-C04 |
|
Pole model |
IERS 2010 Conventions |
IERS 2010 Conventions (Updates: linear pole model) |
|
Precession/Nutation |
IERS 2010 Conventions |
IAU 2006/2000A |
|
Satellite Reference |
||
|
Mass and centre of gravity |
Variable with input from FOS |
Variable with input from FOS |
|
Attitude Model |
Quaternions |
Nominal attitude law |
|
GPS antenna reference point (X,Y,Z) |
Adjusted |
|
|
GPS antenna orientation (Euler angles, Z,Y,X) |
Nadir Pointing |
|
|
Gravity |
||
|
Gravity field (static) |
EIGEN.GRGS.RL04 TVG (120x120) |
GRACE+SLR CNES/GRGS RL04 [EIGEN.GRGS.RL04.v1 (90x90)] |
|
Gravity field (time varying) |
Drift/annual/semi-annual piece wise linear terms up to degree/order 90 |
Drift/annual/semi-annual/bias piece wise linear terms up to degree/order 90 |
|
Solid Earth tides |
Applied (IERS 2010) |
Applied (IERS 2003) |
|
Ocean tides |
FES2014 (100x100, 142 tidal constituents) |
FES2014 |
|
Atmospheric gravity |
GFZ AOD L1B RL06 (100x100) |
AOD1B RL06 (100x100) |
|
Atmospheric tides |
GFZ AOD L1B RL06 (100x100) |
AOD1B RL06 (100x100) |
|
Earth pole tide |
IERS 2010 |
IERS 2003 |
|
Ocean pole tide |
IERS 2010 |
IERS 2010 |
|
Third bodies |
Sun, Moon, Planets DE-421 |
Sun, Moon, Planets INPOP08 |
|
Surface forces and empiricals |
||
|
Radiation Pressure model |
Box-wing model (with re-radiation) |
Box-wing model |
|
Earth radiation |
Albedo and Infra-red applied |
Albedo and Infra-red applied (Knocke et al. 1988) |
|
Atmospheric density model |
msise00 |
NRLMSISE-00 |
|
Radiation pressure coefficient |
1 per arc (loosely constrained to 1.0) |
Fixed (1.0) |
|
Drag coefficients |
10 coefficients per day (loosely constrained to 1.0) |
Fixed (1.0) |
|
1/rev empirical |
2 sets per day: in along-track and cross-track direction (with sin/cos signals) |
1/rev along track and cross track per orbit, constrained (5E-10, 2E-9) |
|
Other empiricals |
n/a |
Constant empirical accelerations along track at 30 min intervals constrained (1E-9) |
|
GPS measurements |
||
|
Relativity |
Applied (IERS 2010) |
Applied (IGS conventions, Shapiro) |
|
Sampling |
10 s |
120 s |
|
Observations |
Iono-free linear combinations of phase and pseudo-range measurements |
Iono-free linear combinations of phase and pseudo-range (normal points) measurements |
|
Weight |
0.8 m (pseudo-range) / 10 mm (carrier-phase) |
2 m (pseudo-range) / 20 mm (carrier-phase) |
|
Elevation angle cut-off |
7 degrees |
10 degrees |
|
Down-weighting law |
None |
Applied for DORIS data |
|
Antenna phase-centre wind-up correction |
Applied |
Applied |
|
Antenna phase-centre variation |
Applied (sen08.atx) |
Applied (CNES map) |
|
GPS parameters |
||
|
Receiver clocks |
Per epoch, every 10 s |
Per epoch, every 120 s |
|
Receiver ambiguities |
Estimated (fixed) |
Estimated (integer) |
|
GPS orbits |
Fixed (CODE finals) |
Fixed (GRG finals) |
|
GPS clocks |
Fixed (CODE finals) |
Fixed (GRG finals) |
|
GPS satellite biases |
CODE finals |
n/a |
|
DORIS troposphere |
n/a |
GPT2/VMF1 |
|
DORIS coordinates |
n/a |
DPOD2014 |
P.C. Knocke, J.C. Ries, and B.D. Tapley. Earth Radiation Pressure Effects on Satellites. Center for Space Research. The University of Texas at Austin, Austin, Texas. 15 August 1988.