GNSS Multipath Detector Based on Linear Adaptive Filter

TitleGNSS Multipath Detector Based on Linear Adaptive Filter
Publication TypeConference Paper
Year of Publication2015
AuthorsBerardo M, Lo Presti LL
Conference NameProceedings of the 28th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2015)
Conference LocationTampa, Florida

Integrity is a topic that in the last years increased its importance not only in the aviation but also in maritime and railways applications, and in general for Safety of Life (SoL) services and liability critical applications. In GNSS receivers local effects due to the environment around the antenna can introduce errors on the estimation of the true delay. A typical disturbing effect in urban environment is multipath (MP), due to the presence of buildings, moving obstacles like cars, tree and the ground. In this paper we propose an MP detector able to assist the integrity algorithms used to exclude the GNNS signals affected by undesired anomalies. The method is based on the well known results of the Linear Adaptive Filter (LAF) theory, [1], and works at the correlation layer, so as to provide an early warning to the integrity algorithms. In the paper it is shown how the LAF coefficients can be used to detect the presence of MP and the validity of the method is proved by simulation.