Comparison concept and quality metrics for GNSS antenna calibrations

Cause and effect on regional GNSS networks

authored by

Tobias Kersten, Johannes Kröger, Steffen Schön

Abstract

Precise values for absolute receiver antenna phase centre corrections (PCC) are one prerequisite for high-quality GNSS applications. Currently, antenna calibrations are performed by different institutes using a robot in the field or in an anechoic chamber. The differences between the antenna patterns are significant and require a sound comparison concept and a detailed study to quantify the impact on geodetic parameters, such as station coordinates, zenith wet delays (ZWDs) or receiver clock estimates. Furthermore, a discussion on acceptable pattern uncertainties is needed. Therefore, a comparison strategy for receiver antenna calibration values is presented using a set of individually and absolutely calibrated Leica AR25 antennas from the European Permanent Network (EPN), both from the robot (Geo++ company) and from the chamber approach (University of Bonn). Newly developed scalar metrics and their benefits are highlighted and discussed in relation to further structural analysis. With our metrics, properties of 25 patterns pairs (robot/chamber) could be used to successfully assign seven individual groups. The impact of PCC on the estimated parameters depends on the PCC structure, its sampling by the satellite distribution and the applied processing parameters. A regional sub-network of the EPN is analysed using the double difference (DD) and the precise point positioning (PPP) methods. For DD, depending on the antenna category differences in the estimated parameters between 1 and 12 mm are identified also affecting the ZWDs. For PPP, the consistency of the observables, i.e. potential differences in the reference point of carrier phase and code observations, additionally affects the distribution among the different parameters and residuals.

Organisation(s)

Institute of Geodesy

Type

Article

Journal

Journal of Geodesy

Volume

96

No. of pages

21

ISSN

0949-7714

Publication date

14.07.2022

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Aerospace Engineering, Electrical and Electronic Engineering, Computers in Earth Sciences, Geochemistry and Petrology, Geophysics

Research Area (based on ÖFOS 2012)

Microelectronics, Satellite geodesy, Geodesy

Sustainable Development Goals

SDG 9 - Industry, Innovation, and Infrastructure

Electronic version(s)

https://doi.org/10.1007/s00190-022-01635-8 (Access: Open)