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INTERNATIONAL DORIS SERVICE
Analysis Strategy Summary
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ANALYSIS CENTRE |
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CONTACT PERSONS |
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SOFTWARE USED |
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IDS PRODUCT: | See http://ids.cls.fr/html/analysis_coord/documents/struct_dc.html
- Type |
- Data span |
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SOLUTION NAME | Refer to section
| http://ids.cls.fr/html/analysis_coord/documents/struct_dc.html#p3
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PREPARATION DATE |
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Please fill in the following sections.
1. MEASUREMENT MODELS
2. ORBIT MODELS
3. ESTIMATED PARAMETERS, including recommended constraints
4. REFERENCE FRAMES
5. OTHER INFORMATION
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| 1. MEASUREMENT MODELS
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| Data editing |
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| 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, SPOT5 satellites)
| |
| | fractional phase differences of a beat frequency
| | (second generation instrument on SPOT5 and JASON1 satel
| | lites)
| |
| |
| |--------------------------------------------------------
| | elevation angle cutoff : degrees
| | weighting :
| | other :
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| Ground antenna | Height dependant on the antenna type
| phase centre cor.|
| |
|---------------------------------------------------------------------------
| Troposphere | zenith delay model
| |--------------------------------------------------------
| | mapping function
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| Ionosphere |
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| Relativity |
| clock effects |
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| Plate motions |
| |
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| Tidal | Solid earth tidal displacement
| displacements |--------------------------------------------------------
| | Pole tide
| |--------------------------------------------------------
| | Ocean loading
|---------------------------------------------------------------------------
| Atmospheric |
| loading |
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| Clocks frequency |
| deviation |
|---------------------------------------------------------------------------
| Satellite center |
| of mass - antenna|
| phase center |
| correction |
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| Satellite |
| attitude |
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| Other |
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| 2. ORBIT MODELS
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| Geopotential |
| |--------------------------------------------------------
| | Constants
| | AE =
| | 1/F =
| | GM =
| | OMEGA =
| | DATE =
|---------------------------------------------------------------------------
| Third-body | planets :
| |
| |--------------------------------------------------------
| | ephemeris :
|---------------------------------------------------------------------------
| Air drag | Air density model :
| | Satellite shape :
| |
|---------------------------------------------------------------------------
| Solar radiation |
| pressure |
| | direct radiation :
| |--------------------------------------------------------
| | Earth shadow model includes:
| |--------------------------------------------------------
| | reemitted radiation:
|---------------------------------------------------------------------------
| satellite | applied
| thermal thrust |
| |
|---------------------------------------------------------------------------
| Tidal forces | solid earth tides:
| |--------------------------------------------------------
| | Ocean tides:
|---------------------------------------------------------------------------
| Atmospheric |
| gravitational |
| attraction |
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| Relativity |
|---------------------------------------------------------------------------
| Numerical |
| Integration |
| |--------------------------------------------------------
| | integration step:
| |--------------------------------------------------------
| | arc length (orbits):
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| 3. ESTIMATED PARAMETERS (APRIORI VALUES & SIGMAS)
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| Adjustment |
| |
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| Reference epoch | Preferred : the median epoch of the data set.
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| Orbital |
| parameters |
| | Initial position and velocity
| |
| | Solar radiaton pressure :
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| | Air drag :
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| | Other :
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| Stations |
| | Station network coordinates and velocities :
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| Troposphere |
| | 1 zenith path delay bias :
| |
|---------------------------------------------------------------------------
| ERP | x & y pôle :
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| Clocks bias |
| | 1 frequency/drift bias :
| |
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| Other |
| parameters |
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| Constraints | Preferred: loose constraints (see note 1 hereafter)
| |
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Note on Constraints on station coordinates.
One of the following three forms should be used:
1. Loose constraints: solutions where the uncertainty applied to the constrainst
is greater than 1 m for positions and greater than 10 cm/year for velocities.
The constraint matrix in the sinex block should be coded "SOLUTION/APRIORI3".
2. Removable constraints: solutions for which the estimated station positions
and/or velocities are constrained to external values within an uncertainty
around 10**-5 m for positions and 10**-6 m/year for velocities. In this case,
the constraint matrix in the sinex block should be coded "SOLUTION/APRIORI3".
3. Minimum constraints used solely to define the Terrestrial Reference Frame
using a minimum amount of required information. For more details on the
concepts and practical use of minimum constraints, see for instance
Altamimi Z., C. Boucher and P. Sillard, 2001. New Trends for the Realization
of the International Terrestrial Reference System, Adv. Space Res., 30, 175.
The Analysis Center is invited to give details of how the method has
been applied.
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| 4. REFERENCE FRAMES
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| Inertial |
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| Terrestrial |
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| Interconnection | Precession:
| |--------------------------------------------------------
| | Nutation:
| |--------------------------------------------------------
| | Celestial pole offsets :
| |--------------------------------------------------------
| | Relationship between UT1 and GMST :
| |--------------------------------------------------------
| | Earth Rotation Parameters
| |--------------------------------------------------------
| | Tidal variations in UT1 and xp:
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| 5. OTHER INFORMATION
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References :