Comparison of Single and Dual Frequency GNSS Receivers in the Presence of Ionospheric and Multipath Errors

In this paper, we test the performance of single and dual frequency GPS and Galileo GNSS receivers in terms of satellite-receiver range estimation. In particular, we focus on the e ects caused by ionosphere and multipath propagation. Therefore, the available pseudoranges are assumed to be contaminated with first-order ionospheric delay and measurement errors produced in the code tracking stage. We used three dual-frequency methods, two ionospheric models (Klobuchar and NeQuick for GPS and Galileo receivers, respectively) and compared their ionosphere-corrected ranges on a Root Mean Square Error basis. The simulation results showed that a dual-frequency receiver is superior to a singlefrequency one, only when the standard deviation of the measurement error is small and when the correlation factor between the two available pseudoranges is higher than 0 4.