Detection and Mitigation of Static Multipath in L1 Carrier Phase Measurements Using a Dual-Antenna Approach

Abstract

Multipath remains a major error source in both static and kinematicpositioning. For example, it takes a toll in the carrier phase, causingthe receiver to measure a distorted phase. Various improvements inreceiver and antenna technologies, as well as modelling strategies,have resulted in better ways of coping with this error source. Multipathhas been shown to be highly correlated for an array of closely spacedantennas. This fact has allowed various investigations using differentantenna/receiver array configurations. In our investigation, we haveused a configuration based on two closely spaced antennas linkedto a single GPS receiver. Our methodology introduces a temporal factorin the measurements, with the assumption that multipath parametersand satellite geometry have a slow variation in time and space. Thispaper presents a spectral analysis, which intends to evaluate theperformance of the multipath parameters estimation process. The analysiscompares estimated multipath signal with the original input datathat feeds the estimation process.