Table 1 Processing strategies for UPD estimation

Observation

IF combination

Frequency

GPS: L1/L2; BDS: B1I/B3I;

Galileo: E1/E5a; GLONASS: G1/G2

Sampling rate

30 s

Cutoff elevation

7°

Satellite orbit and clock

GFZ final products

Tropospheric delay

Saastamoinen model with Global Mapping Function (GMF), and the Zenith Wet Delay (ZWD) estimated as random walk noise.

Tidal displacement

International Earth Rotation Service (IERS) conventions 2010

Antenna PCO and PCV

igs14_2148.atx

Phase wind-up

Corrected

Differential Code Bias (DCB)

CODE (Center for Orbit Determination in Europe) products

UPD estimation

WL: daily constant

NL: 15 min-session constant