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

Multipath remains a major error source in both static and kinematic positioning. For example, it takes a toll in the carrier phase, causing the receiver to measure a distorted phase. Various improvements in receiver and antenna technologies, as well as modelling strategies, have resulted in better ways of coping with this error source. Multipath has been shown to be highly correlated for an array of closely spaced antennas. This fact has allowed various investigations using different antenna/receiver array configurations. In our investigation, we have used a configuration based on two closely spaced antennas linked to a single GPS receiver. Our methodology introduces a temporal factor in the measurements, with the assumption that multipath parameters and satellite geometry have a slow variation in time and space. This paper presents a spectral analysis, which intends to evaluate the performance of the multipath parameters estimation process. The analysis compares estimated multipath signal with the original input data that feeds the estimation process.