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-1 mission. System SPOD_SYSTEM_v0.8.4 is taken as a reference for the change log. 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_v1.11x |
14/06/2021 |
Updated quality control for the EGP |
|
Generation of S-6A NTC products |
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The POD configuration of S-6A ROE products has been modified (GPS with ISB and 30 s observations) |
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New ANTEX files for Sentinels satellites, GNSS satellites and Sentinel-6A LRR have been deployed |
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The macro model for Sentinel-6A satellite has been updated |
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The Sentinels transponder DB (sentransp.dat) has been updated |
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SPOD_SYSTEM_v1.10x |
02/02/2020 |
To change the orbit parametrization of STC and NTC products to:
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|
The macro-model of Sentinel-1 has been updated to account for changes in the areas of the SAR and solar arrays. |
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The albedo model has been updated with new mean VIS/IR maps using CERES data |
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SPOD_SYSTEM_v1.9.x |
16/12/2020 |
Prepare chain in charge of the S-1 NTC reprocessing |
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Update the thermospheric winds model to HWM14 |
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Update the planetary ephemerides to DE-421 |
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Update GPS ANTEX file (igs14_2134.atx), GPS transponder DB (transp2136200.dat), |
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Update Sentinels ANTEX file (sen08_2133.atx) |
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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) |
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SPOD_SYSTEM_v1.7.x |
29/07/2020 |
Change of the S-1 ARP configuration and update of the ANTEX file for S-1 (sen08.atx) |
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Update GPS ANTEX file (igs14_2114.atx) |
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SPOD_SYSTEM_v1.6.0 |
06/05/2020 |
The system has been updated to include the new models |
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The NTC products are now ambiguity fixed |
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Creation of the corresponding chains for being able to upload S-1 NRT/NTC products to the Copernicus Open Access Hub on a daily basis |
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Corrected an under performance when merging GNSS 15M and 24H input files on the generation of the NRT products |
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Update GPS ANTEX file (igs14_2101.atx), GPS transponder DB (transp2104300.dat), and GPS satellite DB (satellite2104300.dat) |
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SPOD_SYSTEM_v1.5.5 |
14/10/2019 |
Quaternions products (AUX_PROQUA) can be generated by the system |
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Alignment of EGP 15M GPS and broadcast clocks products to EGP 24H GPS clocks products during the generation of NRT orbits |
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Enable the generation of S1 AUX_PREORB products |
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Update decoder to properly handle the GPS week rollover occurred on 07/04/2019 |
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Update GPS ANTEX (igs14_2062.atx), GPS transponder DB (transp2062400.dat) and GPS satellite DB (satellite2062400.dat) |
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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 |
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SPOD_SYSTEM_v1.5.3 |
07/11/2018 |
Update the GPS databases to align them with the latest changes in the GPS constellation. |
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SPOD_SYSTEM_v1.5.1 |
04/10/2018 |
Implemented a satellite re-radiation model |
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Implemented a fixed solar array model for S1 |
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SPOD_SYSTEM_v1.5.0 |
05/06/2018 |
Generate quaternions file merging real and simulated attitudes during data gaps. |
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Implement new mechanisms to fill EGP/magic gaps in case of FTP/internet failure |
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Modifications to correct application of North and East PCO values |
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SPOD_SYSTEM_v1.4.2 |
26/02/2018 |
Create chains to generate and distribute data for Sentinel OnLine |
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New antex file with small corrections deployed: sen08_1989.atx |
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New satellite & transponder DBs with small corrections deployed: s3satellite1990100.dat & s3transp1990100.dat |
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Corrections on S3PODIPF for redundant receiver:
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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) |
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Correction of half-cycle ambiguities in the decoding tool (IPF) |
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Align RINEX epochs to GPS time instead of IMT for all the orbital products, but the S-3 NRT ones |
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Enable the uploading of S-1B RESATT products in NRT time |
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| 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 |
| SPOD_SYSTEM_v1.3.0 | 16/02/2017 | Fix a bug in the computation of the Mean Local Solar Time, responsible for occasional peaks of ~100 min. |
| 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) | ||
| New gravity field model EIGEN.GRGS.RL03.v2.coef | ||
| Deploy new ANTEX with S-1B information computed using 84 days of residuals | ||
| SPOD_SYSTEM_v1.1.0 | 20/10/2016 | Deploy new IPF to decode Sentinel-1 quaternions from SAR Annotation files |
| 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_v1.0.9 | 27/06/2016 | Deploy new ANTEX with S-1B information |
| SPOD_SYSTEM_v1.0.8 | 30/05/2016 | Solve issue causing occasional incorrect Orbit Number in EOF NRT products |
| Sentinel-1B launch (22/04/2016) | ||
| SPOD_SYSTEM_v1.0.0 | 18/02/2016 | Updated GPS DBs and GPS ANTEX (igs08.atx) |
| SPOD_SYSTEM_v0.10.0 | 25/01/2016 | Update Box Wing Model for S-1A |
| SPOD_SYSTEM_v0.9.6 | 14/12/2015 | 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 | Deploy updated ANTEX for S1A GPS redundant receiver |
| SPOD_SYSTEM_v0.9.4 | 25/09/2015 | Deploy new ANTEX file with information about S-1A nominal and redundant receiver |
| SPOD_SYSTEM_v0.9.2 | 14/07/2015 | Change NTC determination arc from 72h to 48h |
| SPOD_SYSTEM_v0.9.1 | 24/06/2015 | Change RMS pseudo-range threshold to 1.0 m and adapt QC Reports threshold |
| Add option to interpolate attitude file for attitude products generation | ||
| SPOD_SYSTEM_v0.8.9 | 27/02/2015 | Correct issues in the generation of S-1A attitude product |
| SPOD_SYSTEM_v0.8.8 | 27/01/2015 | New WRMS and editing sigma set to 5.0 instead of 3.0 |
| Write RESATT in EO CFI frame | ||
| SPOD_SYSTEM_v0.8.7 | 08/01/2015 | Change the IERS standards from IERS2003 to IERS2010 |
| Usage of the gravity field model EIGEN6S instead of the GRACE05 | ||
| Usage of the ocean tide model EOT11a instead of FES2004 | ||
| SPOD_SYSTEM_v0.8.6 | 18/11/2014 | Stop upload of S1 RESATT products to FTP |
| Use MPL_PREORB to obtain orbit number for S-1 NTC and NRT products | ||
| SPOD_SYSTEM_v0.8.5 | 29/09/2014 | Remove an interval around manoeuvres in QC Reports to avoid spikes in comparisons |
| Use last 5 available EGP 24H products instead of only one to improve RESORB products accuracy | ||
The following table summarises the different POD models and settings used by the Copernicus POD Service (at GMV).
| 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) |
|
|
GPS antenna orientation (Euler angles, Z,Y,X) |
|
|
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) |
|
1/rev empirical |
2 sets per day: 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 |