Skip to main content

Table 3 Processing strategies for POD and PCE

From: Multi-GNSS products and services at iGMAS Wuhan Innovation Application Center: strategy and evaluation

Item

Model

Observations

Undifferenced code and phase Ionospheric-Free (IF) combination observations

Sampling rate

300 s (POD); 30 s (PCE)

Arc length

1 d

Elevation cutoff

7°

Weighting

Elevation-dependent weighting with priori accuracy of 0.003 cycles and 0.3 m for raw phase and code observations

Satellite antenna

igs14.atx (Rebischung et al., 2016)

Receiver antenna

igs14.atx

Ionospheric delay

IF combination eliminated 1st order effect; higher order not considered

Tropospheric delay

Global Mapping Function (GMF); Saastamoinen model for dry hydrostatic delay; wet part estimated as piecewise constants

Tide forces

Solid Earth tide, pole tide, ocean tide loading

Relativistic effect

International Earth Rotation and Reference Systems Service (IERS) Conventions 2010 (Petit & Luzum, 2010)

Phase wind-up

Correct (Wu et al., 1993)

Geopotential

Earth Gravitational Model (EGM), 12 × 12 (Nikolaos et al., 2012)

N-body gravitation

Sun, Moon and other planets; Jet Propulsion Laboratory (JPL) DE421 (Folkner et al., 2009)

Solar radiation pressure (SRP) model

5-parameter ECOM (Extend CODE Orbit Model, Arnold et al., 2015) for GPS/BDS/GLONASS; ECOM2 (D0, D2c, D2s, D4c, D4s, Y0, X0, X1c, X1s) (Prange et al., 2017) for Galileo

Estimator

The least squares

Station coordinates

Fixed to IGS weekly solutions

Ambiguities

Estimated as constant value for a continuous arc

Earth rotation

Estimate XPOLE, YPOLE, DXPOLE, DYPOLE, UT1, DUT