CONVENTIONS
AND
MODELLING
FOR
REPRO3

IERS Conventions(2010)
Mean Pole tide
As of early 2018, the IERS officially adopted a new (linear) mean pole for purposes of computing rotational deformation (pole tide). See the updated Chapter 7 at
ftp://maia.usno.navy.mil/conventions/2010/2010_update/chapter7/
By adopting a linear mean pole, no corrections are required to C21/S21 going forward.
 only to be implemented during the reprocessing run. Do not implement this in the operational stream otherwise a discontinuity in the velocities will be introduced
 There is the possibility of applying this correction at the solution level, rather than at the observation level
 Here is a presentation by John Ries outling the case for a linear mean pole model here
Subdaily EOP model
HFEOP recommends the use of the Desai&Sibois/Egbert model for diurnal and subdiurnal EOP variation. Coefficients for this model and software to generate EOP predictions can be
obtained from https://ivscc.gsfc.nasa.gov/hfeop_wg/
Solar radiation pressure models
The SRP model to be applied is dependent upon the constellation, and satellite block being processed.
 ACs should upgrade from just ECOM1 modelling, with the exception of GPS Block IIF and IIR satellites
 ECOM2 or JPL GSPM modelling should be used for other GPS Block Types, or a boxwing model
Earth albedo models
Reflected (albedo) and retransmitted radiation from the Earth may cause scale (1  2 cm) and translational effects at GNSS altitudes; see:
A recommended model for these effects,in the form of Fortran source code was originally developed within the scope of the IGS Orbit Modeling Working Group for repro2,
this has recently been updated by Thomas Herring to include new values for GLONASSM and GLONASSK satellites (31 July 2019).
 ERPFBOXW.f Computation of Earth Radiation Pressure acting on a boxwing satellite
 SURFBOXW.f Computes the force on the satellite surfaces for a given radiation vector
 PROPBOXW.f
Provides the satellite dimensions and optical properties for different satellites blocks:
 GPS: GPSI,GPSII,GPSIIA,GPSIIR,GPSIIRA,GPSIIRB,GPSIIRM,GPSIIF,GPSIIIA
 GLONASS: GLONASSM,GLONASSK
 GALILEO: IOV, FOC
Satellite Transmit Power (Antenna Thrust)
Technicial note on satellite transmit power for GPS and GLONASS, by Peter Steigneberger is available from here
Third body effects
— recommend ACs apply all planets into model
Time variable gravity
Other ITRF observing techniques are considering the highest fidelity timevariable gravity model, this is not strictly required for GNSS orbits, but it will be important to stay consistent with their implementation.
Loading Models
— should be consistent with the TVG model, and again consistent across all observing techniques
Reference Frame
Stations categorized by priority for Reference Frame Determination for repro3, provided by Paul Rebischung
Antenna Information for each station
Receiver information for each station
Antenna Modelling
The antenna model to be used for repro3 will be dependent upon the results from the tests of different ANTEX files upon the reference frame
Data Products
use RINEX3 in preference to RINEX2
Provide solutions in updated SINEX formats that support RINEX3
