GNSS satellite induced range biases in the context of differential MF/MC applications

Kurzfassung

Global Navigation Systems (GNSS) have an important role in the navigation in the air, at land and the sea. Especially for safety critical applications like advanced receiver autonomous integrity monitoring (ARAIM), ground based augmentation systems (GBAS) or using space based augmentation systems (SBAS) in general, the estimation and modeling of possible error sources is essential. Error contributions originate in the satellite payload, the propagation path as well as the user receiver. In this study we focus on the error contribution based on the satellite payload imperfections. The work starts with an introduction of the measurement and estimation of the satellite payload imperfections as well as the impact of signal deformations on the pseudo-range for different GPS (Block IIF) and Galileo satellites. The analysis is based on in-phase (I) and quadrature-phase (Q) data recorded with a high gain antenna, which offers almost interference and multipath-free signal reception. The differential code bias with a fixed configuration for the ground station, e.g. 0.1 chips for L1 and 1 chip for L5 as specified in the current DFMC MOPS (EUROCAE WG62) and various parameters for the user is estimated. For the user receiver we extend the receiver parameters to the design space of correlator spacing 0.04-0.21 for L1 and for 0.4 – 1.2 for L5. Based on this differential code biases, the impact on the position solution for one location and different geometries is presented.