VMF3 and VMF1 Position Domain Evaluation: Preliminary Results

A newly released Vienna Mapping Functions 3 (VMF3) is undergone a position domain evaluation along with the International Earth Rotation Service standard Vienna Mapping Functions 1 (VMF1). For this purpose, a selected set of globally distributed GNSS stations is used and processed for an extended period of over 10 years, using the newly available REPRO2 orbits and clocks, in precise point positioning mode. Different strategies for handling neutral atmospheric gradients is being used, either being constrained or estimated. The objective of this work is to assess the impact of using VMF1 and VMF3 at position domain using GNSS observations. The assessment is based on position repeatability since the 'published coordinates' from the GNSS stations are based on VMF1, fact that could bias the assessment. First results will be presented and discussed in this presentation.