Galileo E1/E5 Measurement Monitoring - Theory, Testing and Analysis

Abstract

This research investigates various measurement monitoring techniques to mitigate the effect of GNSS code multipath. After a comprehensive review of different monitoring approaches, the paper focuses on methods that detect and exclude faulty measurements from the position solution. Detection metrics are investigated for single and dual-frequency cases and a new Geometry-Free (GF) detection metric is presented for reliable multipath mitigation. Given the capability of the proposed metric to be combined with a preceding Code-Minus-Carrier (CMC)-based error correction, a detection procedure is performed based on a combination of time-averaging of monitoring metrics and M of N detection strategy. The analytical results are tested by using Galileo E1/E5 data collected in a real multipath environment.