Data Analysis Summary of the DORIS weekly SINEX series used in the IDS combination for the realization of ITRF2014
Sinex Series
Name grgwd40 gscwd23 gopwd43 esawd10 ignwd15 inawd08
Description form TBD TBD TBD TBD TBD TBD
Analysis Center
Name CNES/CLS NASA/GSFC GOP ESA/ESOC IGN INASAN
Contact H. Capdeville F. Lemoine P. Stepanek M. Otten P. Willis S. Kuzin
Additionnal contacts J.M. Lemoine, L. Soudarin D. Chinn N/A N/A N/A S. Tatevian
Software
Name and version GINS v 13.2d1 GEODYN Bernese 5.0 (DORIS development version) NAPEOS 3.7 GIPSY-OASIS II GIPSY-OASIS II (v. 6.2)
SINEX Method (NEQ or COV) COV NEQ COV NEQ COV COV
Data weights (data reduction) 0.3 mm/s 2.0 mm/s (upweighted at NEQ stage, sat by sat basis) 3 mm (range difference) 0.5 mm/s 0.51 mm/s for SPOT2, SPOT3, SPOT4, TOPEX, ENVISAT, CRYOSAT2; 0.4 mm/s for SPOT5, JASON2, HY2A and SARAL 0.51 mm/s for SPOT2, SPOT3, SPOT4, TOPEX, ENVISAT, CRYOSAT2; 0.4 mm/s for SPOT5, JASON2
If COV, Station Constraint 10 m N/A 10 m NEQ 10 m 10 m
If COV, EOP Constraint 15 m N/A Xp, Yp 500 mas NEQ 5 m 5 m
Satellite
satellites included in weekly SINEX start-end start-end start-end start-end start-end  
SPOT2 03/01/1993 - 18/07/2009 03/01/1993 - 18/07/2009 03/01/1993 - 14/07/2009 03/01/1993 - 13/07/2009 03/01/1993 - 14/07/2009 03/01/1993 - 14/07/2009
SPOT3 30/01/1994 - 16/11/1996 30/01/1994 - 16/11/1996 01/02/1994 - 12/11/1996 02/02/1994 - 12/09/1996 02/02/1994 - 14/11/1996 01/02/1994 - 13/11/1996
SPOT4 03/05/1998 - 22/06/2012 03/05/1998 - 31/12/2012 10/05/1998 - 22/06/2013 03/05/1998 - 24/06/2012 01/05/1998 - 18/06/2013 01/05/1998 - 23/06/2013
SPOT5 16/06/2002 - 27/12/2014 16/06/2002 - 31/12/2012 16/06/2002 - 30/08/2014 17/06/2002 - 31/12/2013 11/06/2002 - 31/12/2013 11/06/2002 - 31/12/2013
TOPEX 03/01/1993 - 30/10/2004 03/01/1993 - 30/10/2004 03/01/1993 - 30/10/2004 03/01/1993 - 31/10/2004 01/01/1993 - 01/11/2004 03/01/1993 - 01/11/2004
ENVISAT 21/07/2002 - 07/04/2012 21/07/2002 - 07/04/2012 21/07/2002 - 07/04/2012 21/07/2002 - 07/04/2012 11/04/2002 - 08/04/2012 02/06/2002 - 08/04/2012
JASON1 31/10/2004 - 12/07/2008 31/10/2004 - 12/07/2008 N/A TBD N/A N/A
JASON2 13/07/2008 - 27/12/2014 13/07/2008 - 31/12/2012 13/07/2008 - 30/08/2014 14/07/2008 - 31/12/2013 12/07/2008 - 31/12/2013 12/07/2008 - 31/12/2013
CRYOSAT2 20/06/2010 - 27/12/2014 20/06/2010 - 31/12/2012 30/05/2010 - 30/08/2014 30/05/2010 - 31/12/2013 30/05/2010 - 31/12/2013 30/05/2010 - 31/12/2013
HY2A 02/10/2011 - 27/12/2014 TBD 01/01/2012 - 30/08/2014 02/10/2011 - 31/12/2013 01/10/2011 - 31/12/2013 N/A
SARAL 17/03/2013 - 27/12/2014 TBD N/A TBD 15/03/2013 - 31/12/2013 N/A
Arc cut
Arc lengths 3.5 days nominally (minimum 1 day) 7.0 days, typically 1 day 1 day 1 day 1 day
Handle of Manoeuvers Break arc and Restart at 12am or 12pm; estimated from 2012/01/01 Truncate arc before maneuver. Restart 1-2 hrs afterward. daily arc not processed Included for all satellites with manoeuvre info, others excluded for that day Break arc and start or end at 12:00 Break arc and start or end at 12:00
Handle of Data gaps Arcs truncated for large data gaps and Restarted. Arcs truncated for large data gaps and restarted. daily arcs with large data gaps not processed Nothing daily arcs with large data gaps not processed daily arcs with large data gaps not processed
Additional margins 6hrs before and 6 hrs after for POD but not in SINEX None None None 3hrs before and 3 hrs after for POD but not in SINEX 3hrs before and 3 hrs after for POD but not in SINEX
Reference System
Earth reference system DPOD2008v12 DPOD2008v12 DPOD2008v12 DPOD2008v12 DPOD2008 v1.13 DPOD2008 v1.13
Celestial reference system inertial J2000 inertial J2000 inertial J2000 inertial J2000 inertial J2000 inertial J2000
Polar motion and UT1 IERS C04 08 IERS C04 IERS C04 IERS C04 08 IERS Bulletin A IERS Bulletin A
Background C21, S21   IERS 2010 (Equation 6.5, Petit and Luzum, 2010) IERS 2010 Conventions IERS 2010 (Equation 6.5, Petit and Luzum, 2010) IERS 2003 IERS 2003
Pole model   IERS 2010, (Table 6.6, Petit & Luzum, 2010) IERS 2010 Conventions IERS 2010, (Table 6.6, Petit & Luzum, 2010) IERS 2010 IERS 2010
Precession/Nutation IERS 2010 using NRO origin IERS 2003 IERS 2003 IERS 2010 IERS 2010 IERS 2010
Station coordinates DPOD2008v12 DPOD2008v12 DPOD2008v12 DPOD2008v12 DPOD2008 v1.13 DPOD2008 v1.13
Displacement of reference points
Solid Earth tidal displacement IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions
Ocean loading FES 2012 GOT4.8 FES 2004 EOT11a FES 2004 FES 2004
Tidal atmospheric loading S1/S2 Ray & Ponte (2003) none N/A S1/S2 Ray & Ponte (2003); Also P1, K1; T2, R2. not applied not applied
Non tidal atmospheric loading none not applied N/A none not applied not applied
Solid pole tide displacement IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions
Ocean pole tide displacement none Applied. N/A not applied applied applied
Tidal Geocenter   Applied, GOT4.7 N/A      
Satellite reference
Mass and center of gravity initial values and time evolution from IDS files "sat"mass.txt Initial values and time history from IDS files. Initial values from IDS files Initial values and time history from IDS files. Initial values and time history from IDS files Initial values and time history from IDS files
Attitude Model nominal laws Attitude model, generally; Quaternions for off-nominal TOPEX arcs; Quaternions for Jason-1, Jason-2. Ejo/TU Delft quaternions for Cryosat-2 nominal laws, GSC tunned for SPOTs nominal laws nominal laws nominal laws
Gravity
Gravity field (static) EIGEN-6S2 GOCO02s EIGEN-6S2 after 2002.0, EIGEN-GL04S1 before 2002.0 EIGEN-6S2 EIGEN-6S2.extended.v2.gfc GOCO2S
Gravity field (time varying) EIGEN-6S2 up to degree 95 including time variable terms up to degree 50 (bias & drift per yr from 2002 to 2012, periodic 18.6, 1, 0.5yrs) (1) to 5x5 - fit to SLR,DORIS time series; (2) > 5x5. Annual terms from GSFC-derived GRACE solutions. EIGEN-6S2 after 2002.0,var. terms up to deg. 50. No harmonic terms before 2002.0 EIGEN-6S2 up to degree 120 including time variable terms up to degree 50 (bias & drift per yr from 2002 to 2012, 1, 0.5yrs) from EIGEN-6S2.extended.v2.gfc (1) to 4x4 - fit to SLR,DORIS time series; (2) > 4x4. Annual terms from GSFC-derived GRACE solutions
Solid Earth tides IERS 2010 conventions IERS 2003 IERS 2010 conventions IERS 2010 conventions IERS 2010 IERS 2010
Ocean tides FES 2012 (32 principal waves, + 60 admittance waves) up to degree 50 GOT4.8 FES 2004 EOT11a up to degree order 50 FES 2004 FES 2004
Atmospheric gravity 3hr ERA-interim / ECMWF up to degree 50 ECMWF-6hr (Re-analysis) to 50x50 ECMWF-6hr up to 20X20 AGRA-6hr to 20x20 not applied not applied
Air Tides   Ray and Ponte (2003), S1, S2; K1, P1, R2, T2        
Non tidal oceanic gravity TUGO R12 up to degree 50 TUGO R12 up to degree 50 N/A N/A N/A not applied not applied
Atmospheric tides none (considered through the ECMWF atmospheric data) Terms removed from ECMWF fields applied separately N/A none not applied not applied
Earth pole tide IERS 2010 conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions
Ocean pole tide Desai 2002 up to degree 12 Desai, 2002. Applied to 50x50 C21, S21 IERS Conventions 2010 IERS 2010 Conventions IERS 2010 Conventions IERS 2010 Conventions
Third bodies Sun, Moon, Mars, Venus, Jupiter, Saturn, Uranus and Neptune ephemeris : DE421 (JPL) Sun, Moon, Planets: DE403 (JPL) Sun, Moon, Major Planets DE405 Sun, Moon, Planets: DE405 (JPL) Sun, Moon, Planets: DE421 (JPL) Sun, Moon, Planets: DE421 (JPL)
Surface forces and empiricals
Radiation Pressure model Thermo-optical coefficient from pre-launch box and wing model, with smoothed Earth shadow model; models from CNES document for all satellites except tuned macromodels for Spot-2, -3, -4, Jason2 SPOT-2, SPOT-3: Macromodel Updated from LeBail et al. (2010); SPOT-4: LeBail et al. (2010); SPOT-5: Le Bail et al. (2010) + variable solar array pitch modelled after January 2008; Cryosat2: CNES (7plate) macromodel; Jason-2: CNES (Modified macromodel); TOPEX: Marshall et al. (1995), Marshall and Luthcke (1994); University of College London (UCL) models for Jason-1, and Envisat. Thermo-optical coefficient from pre-launch box and wing model, with smoothed Earth shadow model; models from CNES document for all satellites except tuned macromodels for Spot-2, -3, -4 CNES model for all satellites except for Jason-1/2 (tuned), TOPEX (GSFC values) and Enivsat (ANGARA model) CNES model for all satellites except for Jason-2 (tuned) and Cryosat2 (modified CNES 7plate macromodel) CNES model for all satellites except for Jason-2 (tuned) and Cryosat2 (modified CNES 7plate macromodel)
Radiation pressure scale coefficient 1 coef/day but strongly constrainted (1. e-4) to: 1.03 for Topex; 1.07 for Spot-2; 1.07 for Spot-3; 1.16 for Spot-4; 1.05 for Spot-5; 1.05 for Envisat; 0.94 for Jason-1, 0.97 for Jason-2; 1.00 for Cryosat-2; 0.86 for HY-2A; 1.00 for Saral Cr=1.00 for satellites except, For Jason-2: Cr= 0.945; For Envisat Cr=1.0041747; 1 coeff/day. First iteration without 1-rev parameters, in second iteration constrained (1.e-1) fixed, TOPEX 1.03 SPOT-2/3 1.08 SPOT-4 0.98 SPOT-5 1.04 JASON-1 1.0 JASON-2 0.98 ENVISAT 0.98 CRYOSAT-2 1.0 HY-2A 1.0 fixed: TOPEX 1.03; SPOT-2/3 1.08; SPOT-4 1.13; SPOT-5 1.03; JASON-2 0.92; ENVISAT 1.02; CRYOSAT2 1.05; SARAL 1.08; HY2A 0.88 fixed: TOPEX 1.03; SPOT-2/3 1.08; SPOT-4 1.13; SPOT-5 1.03; JASON-2 0.92; ENVISAT 1.02; CRYOSAT2 1.05
Earth radiation Albedo and IR pressure values interpolated from ECMWF 6hr grids Knocke et al. (1988) apriori model using CERES data Monthly mean Albedo and IR maps at 2.5x2.5 degrees Albedo correction applied Albedo correction applied
Atmospheric density model DTM 94, with best available solar activity MSIS86 MSIS86 MSIS2000 DTM94 DTM2000
Drag coefficients Adjusted; Spots, Envisat, Cryosat2, HY-2A, Saral: 1 coef/4 hours (1/1hr in high solar activity periods) ; Topex,Jasons: 1 coef/half day Cd/8hrs (TOPEX, Jason-1, Jason-2); Cd/1-2 hrs for 800-km satellites depending on solar flux. adjusted 1 coeff./30 minutes for 800-km atellites, 1 coeff./6 hours for others TOPEX, Jason 4 a day rest 10 drag coefficients a day Cd/8hrs (TOPEX, Jason-2); Cd/1hr for SPOT-2,3,4,5, ENVISAT, CRYOSAT2, HY2A and SARAL Cd/8hrs (TOPEX, Jason-2); Cd/1hr for SPOT-2,3,4,5, ENVISAT, CRYOSAT2
1/rev empiricals 2 coeff cos-sin /orbital period in normal direction ; 2 coeff cos-sin /orbital period in tangential direction ; per arc Opr/day along+ cross-track Opr/day along (cross not adjusted) Opr/day along+ cross-track Opr/day along + cross-track Opr/day along + cross-track
DORIS measurements
Troposphere Model GPT2/VMF1 Saastamoinen Saastamoinen Saastamoinen none none
Weather (meteorological data)   GPT GPT GPT not used not used
Troposphere mapping function   GMF GMF GMF VMF1 GMF
Troposphere correction One zenith delay/pass (wet tropo scale factor adjusted) + one daily tropospheric gradient per station in North & East directions Scale factor/pass estimated for wet correction only. One zenith delay/pass (wet tropo scale factor adjusted) One zenith delay/pass  (wet tropo scale factor adjusted) + one daily tropospheric gradient per station in North & East directions wet tropospheric delay estimated per station with reset for some passes only if separated by more than 20 minutes wet tropospheric delay estimated per station with reset for some passes only if separated by more than 20 minutes
2nd order ionosphere Not applied Not applied N/A Not applied Not applied Not applied
Frequency 1 frequency bias adjusted per pass Range-rate bias adjusted/pass; Change in nominal beacon frequency accommodated with modification of partial derivatives. 1 frequency bias adjusted per pass Range-rate bias adjusted/pass; Change in nominal beacon frequency accommodated with modification of partial derivatives. 1 frequency bias adjusted per station clock if separated by more than 20 minutes + 1 frequency bias per satellite clock (except 1) if separated by more than 20 minutes 1 frequency bias adjusted per station clock if separated by more than 20 minutes + 1 frequency bias per satellite clock (except 1) if separated by more than 20 minutes
Relativity Schwarzschild model + Lense-Thirring + geodesic precession Schwarzschild model + Lense thirring + geodesic precession Schwarzschild model + Lense-Thirring + geodesic precession Schwarzschild model + Lense thirring + geodesic precession Schwarzschild model + Lense-Thirring + geodesic precession Schwarzschild model + Lense-Thirring + geodesic precession
Weight models: 0.3 mm/s; measurements: derived from observation standard deviation in data files 2 mm/s. upweighted per satellite at NEQ level. 3 mm (range difference) 0.5mm/s 0.51 mm/s for SPOT2, SPOT3, SPOT4, TOPEX, ENVISAT, CRYOSAT2; 0.4 mm/s for SPOT5, JASON2 , HY2A and SARAL 0.51 mm/s for SPOT2, SPOT3, SPOT4, TOPEX, ENVISAT, CRYOSAT2; 0.4 mm/s for SPOT5, JASON2
Elevation angle cutoff 12 degrees 10 degrees 10 degrees 7 degrees 7 degrees 12 degrees
Downweighting law Downweighting law for elevation <= 20 deg; Weight of the observation is multiplied by the factor elevation**2/400 with elevation in degrees) none none TBD (currently sin(elevation) after 2002) 1/sqrt(sin(elevation)) 1/sin(elevation)
Satellite system Center of mass - antenna phase center vector computed from macro model + attitude law; no phase law applied tracking point offset applied using offset information and attitude law and quaternions for spacecraft. Center of mass - antenna phase center vector computed from macro model + attitude law; no phase law applied Center of mass - antenna phase center vector computed from macro model + attitude law; no phase law applied Center of mass - antenna phase center vector computed from macro model + attitude law; no phase law applied Center of mass - antenna phase center vector computed from macro model + attitude law; no phase law applied
Ground system Phase centre / reference point vector from manufacturer values; phase law applied (Alcatel, Starec version 2013) Phase correction + vertical eccentricity applied in GEODYN or through modification of DPOD2008v12 station coordinates Phase centre / reference point vector from manufacturer values; phase law applied (Alcatel, Starec version 2013)   Phase centre / reference point vector from manufacturer values; phase law applied (Alcatel, Starec) Phase centre / reference point vector from manufacturer values; phase law not applied (Alcatel, Starec)
DORIS System Time Bias   Model applied for TOPEX/Poseidon derived from SLR-DORIS arcs. N/A     no bias correction applied to satellite clock
South Atlantic Anomaly Corrective model for Jason-1; corrected measurements for Spot-5 from 2006 only Corrective model applied for Jason-1; Corrective model applied for SPOT-5 (2006.0 - onward) Corrected measurements for Spot-5 (2006.0 - onward). Jason-1 data not used at all Corrective model for Jason-1; corrected measurements for Spot-5 from 2006 only Jason-1 data not used at all; corrective model applied for SPOT-5 (2006.0 - onward) . A few stations removed for SPOT-5 data (Arequipa, Cachoeira, Easter Island, Kourou) Jason-1 data not used at all; corrective model applied for SPOT-5 (2006.0 - onward)