Context

This file contains gravitational deformation information for various radio telescopes used for geodetic and astrometric VLBI. It is the extra delay introduced by deformation of the antenna given as a function of elevation.

Methodology

The data was collected from on-site personnel and during campaings described in the related publications

Involved persons are listed as "Contributors"

All related publications are listed under "Related work"

Technical details

The data is stored in fixed format ASCII

Lines that start with "#" are comments and can be ignored

For each antenna the general format is:

ANTENNA NUM_PTS SCALE (name of the antenna, number of points, optional scaling factor which converts the delay into ps (i.e., if scale is 3.336 than the raw values are in mm))

EPOCH YYYYMMDD  YYYYMMDD    beginning and ending epoch of model (this line is optional)

el1  delay1 (excess delay as a function of elevation, scale factor converts this to ps)

el2  delay2

Further details

version 2025.09.28 includes following VLBI telescopes:

EFLSBERG (Artz et al., 2014, J Geod)

GILCREEK (Clark and Thomsen, 1988)

HOBART26 (Lösler et al., 2025, EPS)

KOKEE

MEDICINA (Sarti et al., 2009, J Geod)

NOTO (Sarti et al., 2010, Ann Geophys)

NYALES20 (Hedekvist et al., 2025, EVGA pp. 100-105)

ONSALA60 (Nothnagel et al., 2019, J Geod)

ONSA13NE (Lösler et al., 2019, J Geod)

ONSA13SW (Lösler et al., 2019, J Geod)

WETTZELL

WETTZ13S

WETTZ13N

YEBES40M (Nothnagel et al., 2014, IVS GM)