VLBI and GPS inter- and intra-technique combinations on the observation level for evaluation of TRF and EOP

Earth, Planets and Space

Table 3 Parameterization of the target parameters

Parameter	Parameter type	sol-V	sol-G	sol-VG	sol-VV
Parameter	Parameter type	Temporal resolution/information
ZWD	PWL offset	1 h	0.5 h	0.5 h	1 h
Trop. gradients	PWL offset	12 h	6 h	6 h	12 h
VLBI clock reference	–	ONS	–	ONS	ONS/FDV
Station clocks	2nd order polynomial	\(\boxtimes\)	\(\boxtimes\)	\(\boxtimes\)	\(\boxtimes\)
Station clocks	And PWL offset	1 h	5 min	5 min	1 h
EOP	Constant offset	24 h	–	24 h	24 h
Station coordinates	Constant offset	24 h	24 h	24 h	24 h
GPS phase ambiguities	Constant offset	–	AR	AR	–
Clock constraints	–	72 ps/h	36 ns/h	72 ps/h (V)	72 ps/h
				36 ns/h (G)
ZWD constraints	–	32 mm/h	32 mm/h	32 mm/h	32 mm/h
A priori TRF		VTRF2019	ITRF2014	ITRF2014	VTRF2019
A priori CRF	ICRF-3
A priori EOP	IERS-14-C04

Presented are parameter type and temporal resolution that are used for the four different solutions. ONS and FDV stand for the VLBI station ONSALA60 and FD-VLBA, respectively. AR refers to constant offsets with non canonical timelengths as calculated by the GPS phase ambiguity resolution mode of c5++