Some results of analysis of source position time series

TL;DR

This paper analyzes VLBI source position time series from IVS, comparing different analysis strategies, identifying sources with irregular variations, and evaluating noise estimation methods to improve geodetic and astrometric accuracy.

Contribution

It provides a comparative analysis of source position time series from various software and strategies, highlighting differences and identifying sources with irregular behavior.

Findings

Significant differences in scatter and systematic behavior across series

Identification of sources with irregular position variations

Comparison of RMS and ADEV for noise estimation

Abstract

Source position time series produced by International VLBI Service for Geodesy and astrometry (IVS) Analysis Centers were analyzed. These series was computed using different software and analysis strategy. Comparison of this series showed that they have considerably different scatter and systematic behavior. Based on the inspection of all the series, new sources were identified as sources with irregular (non-random) position variations. Two statistics used to estimate the noise level in the time series, namely RMS and ADEV were compared.