FIG Peer Review Journal


GNSS Antenna Offset Field Test in Metsähovi (5580)

Ulla Kallio, Hannu Koivula, Sonja Nyberg, Paavo Rouhiainen and Veikko Saarinen (Finland)
M.Sc. Ulla Kallio
Senior Research Scientist
Finnish Geodetic Institute
Geodeetinrinne 2
Corresponding author M.Sc. Ulla Kallio (email: ulla.kallio[at], tel.: +358 407084023)

[ abstract ] [ paper ] [ handouts ]

Published on the web 2012-03-08
Received 2011-11-01 / Accepted 2012-02-02
This paper is one of selection of papers published for the FIG Working Week 2012 in Rome, Italy and has undergone the FIG Peer Review Process.

FIG Working Week 2012
ISBN 97887-90907-98-3 ISSN 2307-4086


The phase center variation and the mean phase center of the GNSS antenna can be determined in the robot calibration. We have studied how well the offset values are valid in the field and the consistency between two sets of antennas of different type. We measured 24 full 48 hour sessions in our relative GNSS antenna field calibration during three months in summer 2011 at Metsähovi fundamental station. We chose the full roving observation strategy (Banyai 2005) and circulated nine Ashtech Choke Ring antennas without radome and eight Leica AR25 antennas with radome on three concrete pillars. Data were processed with Bernese GPS Software ver. 5.0 and offset estimation was coded using Octave software. In the Bernese processing we used the Geo ++ absolute calibration offset values but in combining the 24 session solutions we still found significant antenna dependent offsets especially in L2 solution between the two antenna types. The offset values of the individual absolute calibration were not consistent between the two antenna types tested in Metsähovi. There seems to be biases which propagate to the coordinate results. Changing the antenna type in a permanent station may cause cm level jump in time series due to the errors in the offset values.
Keywords: GNSS/GPS; Positioning; GNSS antenna offset; field calibration