Description of inawd03 series This weekly times series of coordinates is expressed in free-network. No projection, nor transformation was done. The gravity field is GGM01C (120x120). DORIS data have been processed daily with all available satellites (the number of satellite depends from time period of processing and appears in sinex file) using a free-network approch of Gipsy-Oasis II software. Daily stations positions and EOP have been combined on a weekly basis. JASON/DORIS data have not been used at all. SPOT4 data have not been processed only for 1998. All data were processed with elevation cutoff = 15 degrees and new satellites macromodels. Specific information on stations OTTA: Ottawa: several points have been defined for the same antenna using information contained in the DORISMail #0062 jan 4, 1999 AREA: Arequipa: A seond point has been defined after the 2001, June Earthquake. COLA: Colombo: A second point has been defined after November 1994 DIOA: Dyonisos: A second point has been defined after April 1, 1995 SAKA: Sakhalin: A second point has been defined after Oct 5, 1994 (earthquake on Oct 4, 1994) SAKA: Sakhalin: A thhird point has been defined after Dec 26, 1999 KRAB: Krasnoyarsk: A second point has been defined after Nov 1999 SODB: Soccorro Is.: A second point has been defined after Oct 3, 2002 (earthquake on Oct 3, 2002) AMSA: all data have been deleted after Jan 1, 1996 (antenna fall) AMSB: Amsterdam all data have been deleted (antenna fall) SODA: All data have been deleted before Jan 1, 1996 (volcano depletion) ============================================================================= INTERNATIONAL DORIS SERVICE INASAN INASAN (INstitute of AStronomy Russian Academy of Sciences) Analysis Strategy Summary ============================================================================= ANALYSIS CENTRE | | INASAN | | Institute of Astronomy Russian Academy of Sciences | 48,Pyatnitskaya St.,Moscow 109017,Russia | ----------------------------------------------------------------------------- CONTACT PERSONS | | Suriya Tatevian: | E-mail : statev@inasan.ru | Tel. : 7-(095)-951-29-23 | | Sergey Kuzin: | E-mail : skuzin@inasan.rssi.ru | Tel. : 7-(095)-951-29-23 ----------------------------------------------------------------------------- SOFTWARE USED | | GIPSY-OASIS II developed at JPL | ----------------------------------------------------------------------------- IDS PRODUCTS | | | Precise Orbits | Earth Orientation Parameters | Station coordinates and velocities and time series | (multi-satellites solutions) | | (Products description and format are still under definition) | | ----------------------------------------------------------------------------- PREPARATION DATE | Dec.2001 till now | ============================================================================= ----------------------------------------------------------------------------- | MEASUREMENT MODELS | |---------------------------------------------------------------------------| | Data editing | CNES Pre-processing | | | residual > 2 mm/s for all satellites | | | residual > 1.5 mm/s for JASON | |---------------------------------------------------------------------------| | Basic measurement| | | | 2 frequencies : 2,03625 GHz (principal channel) and | | | 401.25 MHz | | | | | | entire number of cycles of a beat frequency (first | | | generation instrument on SPOT2, SPOT3, SPOT4, TOPEX/ | | | POSEIDON, ENVISAT, SPOT5 satellites) | | | | | | fractional phase differences of a beat frequency | | | (second generation instrument on SPOT5 and JASON1 satel| | | lites) | | | | | | | | |--------------------------------------------------------| | | elevation angle cutoff : as imposed by CNES | | | weighting : 0.5 mm/s | | | other : | |---------------------------------------------------------------------------| | Ground antenna | Height dependant on the antenna type | | phase centre cor.| | | | | |---------------------------------------------------------------------------| | Troposphere | Zenith delay: Adjusted as random walk (5 cm over 1 day)| | |--------------------------------------------------------| | | LANYI mapping function | |---------------------------------------------------------------------------| | Ionosphere | not modeled (ionospheric effects accounted for by | | | dual frequency observations) | |---------------------------------------------------------------------------| | Relativity | Applied | | clock effects | | |---------------------------------------------------------------------------| | Plate motions | Not applied | | | | |---------------------------------------------------------------------------| | Tidal | Solid earth tidal displacement : Wahr model | | displacements |--------------------------------------------------------| | | Pole tide : applied | | |--------------------------------------------------------| | | Ocean loading : applied | |---------------------------------------------------------------------------| | Atmospheric |Not applied | | loading | | |---------------------------------------------------------------------------| | Clocks frequency | onboard frequency bias deduced from the master beacon | | deviation | (a bias per satellite pass) | |---------------------------------------------------------------------------| | Satellite center | applied | | of mass - antenna| | | phase center | | | correction | | |---------------------------------------------------------------------------| | Satellite | For TOPEX/POSEIDON, JASON and ENVISAT. | | attitude | SPOT satellites orientation is geocentric | | | | |---------------------------------------------------------------------------| | Receiver-antenna | depends on the channel and the instrument generation | | propagation delay| | | | | |---------------------------------------------------------------------------| ----------------------------------------------------------------------------- | ORBIT MODELS | |---------------------------------------------------------------------------| | Geopotential | GGM01C model up to degree 120 and order 120 | | |--------------------------------------------------------| | | Constants: | | | AE = 6378.137 km | | | 1/F = 298.25765 | | | GM = 398600.4415 km**3/sec**2 | | | OMEGA = 0.7292115 rad/sec | | | DATE = 1986.0 | |---------------------------------------------------------------------------| | Third-body | planets : Sun, Moon, Mars, Venus, Jupiter, Saturn, | | | Mercury, Uranus, Neptune, Pluto | | |--------------------------------------------------------| | | ephemeris : DE405s (JPL) | |---------------------------------------------------------------------------| | Air drag | Air density model : DTM94 | | | Satellite shape from macromodel | | | | |---------------------------------------------------------------------------| | Solar radiation | direct radiation : applied | | pressure |--------------------------------------------------------| | | Earth shadow model: penumbra | |------------------|--------------------------------------------------------| | Satellite | not applied | | thermal thrust | | |---------------------------------------------------------------------------| | Tidal forces | Solid earth tides: Wahr model | | |--------------------------------------------------------| | | Ocean tides: | |---------------------------------------------------------------------------| | Relativity | Schwarzschild model | |---------------------------------------------------------------------------| | Numerical | variable (high) order Adams predictor-corrector | | Integration | with direct integration of second-order equations | | |--------------------------------------------------------| | | integration step: variable | | |--------------------------------------------------------| | | arc length (orbits): 30 hours | ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- | ESTIMATED PARAMETERS (APRIORI VALUES & SIGMAS) | |---------------------------------------------------------------------------| | Adjustment | Weighted least squares implemented as | | | square root information filter | |---------------------------------------------------------------------------| | Orbital | | | parameters | Initial position and velocity. | | | Solar radiaton pressure scale stochastically varying | |---------------------------------------------------------------------------| | Stations | | | | Station network coordinates and velocities, cartesian | | | system. Constraints applied after estimation of entire | | | fiducial-free network to allow solutions for entire | | | network when required | |---------------------------------------------------------------------------| | Troposphere | | | | 1 zenith path delay bias estimated per satellite pass | | | as random walk | |---------------------------------------------------------------------------| | Ionospheric | no parameters estimated | | correction | | | | | |---------------------------------------------------------------------------| | ERP | XPOLE, YPOLE,XPOLERATE, YPOLERATE | | | UT1-UTC,UT1-UTCRATE | |---------------------------------------------------------------------------| | Clocks bias | | | | 1 frequency bias mixed receiver-station per satellite | | | pass | |---------------------------------------------------------------------------| | Other | | | parameters | | ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- | REFERENCE FRAMES | |---------------------------------------------------------------------------| | Inertial | Geocentric; mean equator and equinox of 2000 Jan 1 | | | at 12:00 (J2000.0) | | | | |---------------------------------------------------------------------------| | Terrestrial | ITRF.. reference frame with realization description | | | DORIS station coordinates and velocities in sinex file.| | | Sinex file has been obtained using a free-network | | | approach with next projecting in rotation, translation | | | and scale | |---------------------------------------------------------------------------| | Interconnection | Precession: IAU 1976 Precession Theory | | |--------------------------------------------------------| | | Nutation: IAU 1980 Nutation Theory | | |--------------------------------------------------------| | | Tidal variations in UT1: applied for periods <= 32 days| -----------------------------------------------------------------------------