Table 2 Models and conventions used for RSA

Software

GAMIT (ver. 10.3–10.6) / GLOBK

Bernese GNSS Software Version 5.2

Satellites

GPS

GPS

Reference frame

ITRF2005 (IGS05)

ITRF2014 (IGb14)

Orbit and EOP

IGS final

IGS repro2 (~ 2015-02-14) IGS final (2015-02-15 ~)

Phase center correction

Absolute PCVs/PCOs of igs05_wwww.atx are applied except that GSI original models are used for domestic stations

Absolute PCVs/PCOs of igs14_wwww.atx are applied except that GSI original models are used for domestic stations

Elevation cutoff angle

10 degree

7 degree

Solid earth tide

IERS2003

IERS2010

Ocean tide loading

FES2004 (Lyard et al. 2006)

FES2004 (Lyard et al. 2006)

Ionosphere

1st order: eliminated by forming the ionosphere-free linear combination, 2nd or higher order: no corrections applied

1st order: eliminated by forming the ionosphere-free linear combination, 2nd or higher order: no corrections applied

Troposphere

GMF/GPT

GMF/GPT

Troposphere time step

2 h (ZTD and gradients)

1 h (ZTD)

24 h (gradients)

Stations

Targets: 3 constraining: 10 non-constraining: 12

Targets: 3 constraining: ~ 100 non-constraining: 5

A priori coordinates

Given by station position and velocity of ITRF2005

Given by station position, velocity and PSD of IGb14

Constraining condition

Orbit and EOP: tight constraints with a priori value, station: no-net-rotation

Orbit and EOP: tight constraints with a priori value, station: no-net-translation