Table 4 Models and conventions used for GSA

Software

Bernese GNSS Software Version 5.0

Bernese GNSS Software Version 5.2

Satellites

GPS

GPS

Reference frame

ITRF2005 (IGS05)

ITRF2014 (IGb14)

Orbit and EOP

Steigenberger et al. (2006) (~ 2006-11-04)

IGS final (2006-11-05 ~)

IGS repro2 (~ 2015-02-14)

IGS final (2015-02-15 ~)

Phase center correction

GSI original models

GSI original models

Elevation cutoff angle

15 degree

15 degree

Solid earth tide

IERS2003

IERS2010

Ocean tide loading

GOTIC2 (Matsumoto et al. 2001)

GOTIC2 (Matsumoto et al. 2001)

Ionosphere

1st order: eliminated by forming the ionosphere-free linear combination, 2nd or higher order: IGS global ionosphere model

1st order: eliminated by forming the ionosphere-free linear combination, 2nd or higher order: IGS global ionosphere model

Troposphere

NMF / Saastamoinen (1973)

VMF1 / ECMWF

Troposphere time step

3 h (ZTD)

24 h (gradients)

1 h (ZTD)

3 h (gradients)