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| Phenomenon | Model | References (in IERS Technical Note 36) | |
| General | Speed of light | 299792458 ms^-1 | Tab. 1.1 |
| Gravitational constant of the Earth | 3.986004418 × 10^14 m^3s^-2 | ||
| Equatorial radius of the Earth | 6378136.6 m | ||
| Dynamical flattening | 3273795 × 10^-9 | ||
| Time system | terrestrial time: TT, barycentric time: TCB | ||
| Terrestrial reference frame (a priori) | ITRF2008/IGb08/SLRF2008/VTRF2008 | Chapter 4.2.4; Altamimi et al. (2011) | |
| Celestial reference frame (a priori) | ICRF2 | Chapter 2.2; IERS Technical Note 35 | |
| Ephemerides | JPL ephemerides DE421, if possible | Folkner et al. (2009) | |
| Station coordinates | Solid Earth tides | conventional routine from Dehant & Mathews | Chapter 7.1.1.1 |
| Permanent tide | conventional tide free system | Chapters 1.1, 7.1.1.2 | |
| Solid Earth pole tide | polynomial trend for mean pole offsets (IERS2010) | Chapter 7.1.4; Tab. 7.7 | |
| Ocean pole tide loading | Desai (2002), if possible | Chapter 7.1.5 | |
| Tidal ocean loading | FES2004; HARDISP.F; CoM-corrected values | Chapter 7.1.2 | |
| Non-tidal ocean loading | not applied | Chapter 7.2 | |
| Tidal atmospheric loading | model (Bernese format) provided by J. Böhm applied | Chapter 7.1.3 | |
| Non-tidal atmospheric loading | model (Bernese format) provided by J. Böhm applied | Chapter 7.2 | |
| Earth orientation parameters | A priori EOP | IERS 08 C04 | Bizouard and Gambis (2011) |
| http://hpiers.obspm.fr/iers/eop/eopc04/eopc04_IAU2000.62-now | |||
| Interpolation of a priori polar motion | linear interpolation | ||
| Interpolation of a priori UT1 | (1) reduction to UT1R and LODR | Chapter 8.1; Tab. 8.1 | |
| (2) linear interpolation using UT1R and LODR | |||
| (3) conversion to UT1 and LOD | Chapter 8.1; Tab. 8.1 | ||
| Interpolation of a priori nutation | linear interpolation | ||
| Subdaily ocean tidal effects | IERS2010, Eanes (2000) | Chapter 8.2 | |
| Atmospheric tidal effects | not applied | ||
| Precession-nutation model | IAU 2006/2000A | Chapter 5.6; Mathews et al. (2002) | |
| Free core nutation | not applied, if nutation parameters are estimated; IERS 08 C04 corrections, if nutation parameters are not estimated | Chapter 5.5.5 | |
| Subdaily nutation | IERS2010; Ray et al. (1994) | Chapter 5.5.3.2 | |
| UT1 libration | Brzezinski and Capitaine (2003) | Chapter 5.5.3.3 | |
| Gravity field | A priori terrestrial model | EGM2008 | Chapter 6.1; Pavlis et al. (2012) |
| A priori lunar model | Konopliv et al. (2001) | ||
| Solid Earth tides | Mathews et al. (2002) | Chapter 6.2.1 | |
| Permanent tide | conventional tide free system | Chapters 1.1, 6.2.2 | |
| Ocean tides | FES2004 | Chapter 6.3; Lyard et al. (2006) | |
| Solid Earth pole tide | IERS2010 | Chapter 6.4 | |
| Ocean pole tide | Desai (2002), if possible | Chapter 6.5 | |
| S1/S2 atmospheric tides | model (Bernese format) provided by J. Böhm applied | ||
| Non-tidal atmospheric effect | model (Bernese format) provided by J. Böhm applied | ||
| Troposphere (microwave) | Hydrostatic a priori model | computed from 6-hourly ECMWF grids; account for the station and mean grid height differences | Kouba (2008) |
| Hydrostatic mapping function | hydrostatic VMF1 | Chapter 9.2; Boehm et al. (2006) | |
| Wet a priori model | none; wet delay estimated | ||
| Wet mapping function | wet VMF1 = wet VMF | Chapter 9.2; Boehm et al. (2006) | |
| A priori gradients | none; gradients estimated | ||
| Gradient mapping function | Chen and Herring (1997) | Chapter 9.2 | |
| Trop. (SLR) | A priori model | Mendes and Pavlis (2004) | Chapter 9.1 |
| Ionosphere | Earth's magnetic field | IGRF-11 | Finlay et al. (2010) |
| First order effect | accounted for by linear combination of multi-frequency observations | Chapter 9.4 | |
| Second order effect | Fritsche et al. (2005) using IGRF-11 | ||
| Third order effect | |||
| Ray bending | IERS2010 | Chapter 9.4.1; Equation (9.37) | |
| Relativistic model | Schwarzschild terms | IERS2010 | Chapter 10.3; Equation (10.12) |
| Lense-Thirring precession | IERS2010, if possible | ||
| Geodesic (de Sitter) precession | IERS2010, if possible | ||
| Gravitational time delay | Shapiro (1969, 1971) | Chapter 11.2; Equation (11.17) | |
| GNSS effects | Phase center corrections for satellite and receiver antennas | ftp://igs.org/igscb/station/general/igs08_1711.atx | Chapter 7.3.3 |
| Receiver antenna heights | IGb08.snx + IGSMAIL/IGSSTATION | ||
| Horizontal antenna excentricities | IGb08.snx + IGSMAIL/IGSSTATION | ||
| Satellite attitude model | nominal attitude; exclude shadow crossings | ||
| A priori radiation pressure | none | ||
| Phase wind-up | Wu et al. (1993) | ||
| SLR effects | Center of mass corrections (laser reflector array offsets) | standard corrections from http://ilrs.gsfc.nasa.gov/missions/ spacecraft_parameters/ center_of_mass.html | |
| Range/time biases | ILRS_Data_Handling_File.snx | ||
| Arc length | 7 days | ||
| VLBI effects | Thermal telescope deformations | Nothnagel (2009) | Chapter 7.3.2 |
| A priori tropospheric gradients | MacMillan and Ma (1997), provided in SINEX format, if available for a specific station; none otherwise | ||
| Gravitational sag | not applied |
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| Parameter | Representation | Resolution | A priori values | Stored in SINEX? |
| Station coordinates | constant offset | 1 d or 7 d | ITRF2008/IGb08/SLRF2008/VTRF2008 | yes |
| Pole coordinates | piecewise linear or offset+drift | 24 h | IERS 08 C04; IERS subdaily ERP model | yes |
| ΔUT1 | piecewise linear or offset+drift | 24 h | IERS 08 C04; IERS subdaily ERP model | yes |
| Nutation | X, Y representation, if possible; | 24 h | none (parameters represent corrections to a priori model) | yes |
| piecewise linear or offset+drift | ||||
| Troposphere zenith delays (MW) | piecewise linear | 2 h | hydrostatic VMF1 | yes |
| Troposphere gradients (MW) | piecewise linear | 24 h | none, except for VLBI | yes |
| Quasar coordinates | constant offset | 1 d | ICRF2 | yes |
| Gravity field coefficients | constant offset | EGM2008 | yes |
